Interpretation Of Satellite Images Research Articles

Geomorphic Indicators of Folds Lateral Growth Using Satellite Images

Visual interpretation of satellite images is a very significant technique to recognize and interpret structural features, which indicate lateral growth of folds, the origin of folds, and dating of folds using the exposure dating method. In this study, Landsat 8 (ESSRI) and Google Earth images are used to recognize structural features at Pira Magroon, Surdash, and Azmar anticlines in the Sulaimaniyah vicinity, Kurdistan Region, north of Iraq. The mentioned anticlines are outstanding geomorphological and structural features in the Sulaimaniyah vicinity. The recognized and interpreted structural features include: en-echelon folding, domes, and Neotectonic indication. All these features are discussed in detail with many images to show the discussed cases, most of the interpreted data and presented figures are never mentioned previously.

Seismotectonics, Geomorphology and Paleoseismology of the Doroud Fault, a Source of Seismic Hazard in Zagros

In this study, the active tectonics, paleoseismicity, and seismic hazards of the Doroud Fault are examined through high-resolution satellite image interpretations, field investigations, outcrop and trench excavations, and the dating of geochronology samples. The Doroud Fault (DF), one of the essential segments of the Main Recent Fault in the northern margin of the Zagros mountain range, has a historical and instrumental background of high seismicity. We present the first constraints from tectonic geomorphology and paleoseismology along the Doroud Fault near the capital city of Dorud. Detailed observations from satellite imagery, field investigations, real-time kinematic (RTK) measurements, paleoseismological trenching, the radiocarbon (C14), and optically stimulated luminescence (OSL) as ages allowed us to map the fault in detail, describe and characterize its kinematics, and document its recent activity and seismic behavior (cumulative displacements, paleoseismicity, and magnitude, as well as recurrence interval) relevant to the recent seismic activity of the Doroud Fault during the late Holocene as one of the most important seismogenic faults in Zagros. Modern alluvial terraces of gullies and loess accumulations are systematically deflected and/or offset with co-seismic rupture, landslides, and scarps, indicating that the Doroud Fault has been active in the late Quaternary and is characterized by dextral strike–slip movements with a normal component. In addition, our findings provide a comprehensive analysis of the fault displacement, the timing of paleoearthquakes, and the right-lateral slip rate of the Doroud Fault. The late Holocene slip rate of the Doroud Fault using the OSL dating the gully is as follows: the minimum and maximum horizontal slip rates are estimated to be 1.82 and 2.71 mm/yr, and vertical slip rates of 1.03 and 1.53 mm/yr are calculated for the past 4600 ± 900 years in the middle segment of the fault. This study focused on a paleoseismological trench within the archeological sites of Darbe-Astaneh. The central portion of the fault has historically hosted more than nine earthquakes in the last 66 ka years, according to the study’s findings. According to paleoseismology studies, the Doroud Fault has the seismic capability to cause earthquakes with a magnitude of more than 7.4 and a total slip rate of about 3.83 ± 0.1 m. The average recurrence interval for the identified paleoearthquakes is approximately 104 ± 7 years.

Spatial and Temporal Study of Supernatant Process Water Pond in Tailings Storage Facilities: Use of Remote Sensing Techniques for Preventing Mine Tailings Dam Failures

Considering the global impact on society due to tailings storage facilities (TSFs) accidents, this article describes a study to monitor mine tailings management and prevent mining tailings dam failures, considering the analysis of different TSFs real cases. The spatial and temporal dynamic behavior of the supernatant process water pond of the TSFs is studied as a critical issue, using remote sensing techniques based on multispectral satellite imagery. To understand the current state of the art, a brief description of engineering studies for the control and management of the supernatant process water pond in TSFs is presented. This research considers the main method of the study of practical cases with the use of techniques of multispectral interpretation of satellite images from the Sentinel 2 remote sensor. In addition, the management of tools such as Geographical Information System (GIS) and Google Earth Engine (GEE) is implemented, as well as the application of some spectral indices such as NDWI and the joint use of (i) NDVI, (ii) mNDWI, and (iii) EVI. Real TSF cases are analyzed, including the dam failures of Jagersfontain TSF in South Africa and Williamson TSF in Tanzania. Finally, this article concludes that the size, location, and temporal variability of the supernatant process water pond within a TSF has a direct impact on safety and the possible potential risk of the physical instability of tailings dams.

GIS and remote sensing – desertification and progression of silting-up in the high plains of Oran in Western Algeria

The expansion of silting in the Algerian High Plains of south Oran (northwestern Algeria) is the ultimate manifestation of desertification. The presence, accumulation or deposition of sands in areas that previously did not contain any is the most visible sign of this silting up phenomenon that has begun to appear in recent decades. The present study focuses on the evolution and progression of silting up in the region under study. It is worth noting that assessing the narrowing of the vast endorheic depressions in this area is a very complicated task due to the vastness of the place. In order to deal with this problem in an efficient manner, it was deemed necessary to use remote sensing as it offers possibilities of global vision of the area to be studied and allows a precise description in time and space of this region. In order to efficiently identify and apprehend the phenomenon mentioned above, it was decided to adopt an analysis methodology that is based on the processing and interpretation of multi-date satellite images, combined with exogenous data. It should be noted that the topographic maps of Mecheria and Ain Sefra are given at a scale of 1/200,000 and are supplemented by some field data, along with some wind data. The analysis of data brought from different sources has made it possible to locate, characterize and map the evolution and the spatio-temporal dynamics of the recent extension of sandy accumulations, old Quaternary dune belts, and shrinking of vast endorheic depressions (Chott El Gharbi and Sebkhat Nâama). It is widely acknowledged that areas that are most affected by the progression of silting are the Plain of Naama, that is surrounded by the first Saharan Atlas ranges and by the orographic corridor formed by the double SW/NE alignment of Djebel (Mount) Morhad, Djebel Suigua, Djebel Aissa and Djebel Mekter located south of Ain Sefra. It is important to note that all this information, which is extracted from satellite images and exogenous data, will be integrated into a GIS.

Utilization of Spatial Data on Agricultural Activities Case Study of Tebas District

The dominant potential of agricultural activities is not in line with the dissemination of adequate information on agricultural activities, thus causing agricultural activities in Tebas District to be unknown to the wider community. Information about agricultural activities will be more easily accessed by the community in Tebas District with the existence of a web-based geographic information system where people can get non-spatial information and also spatial information from agricultural activities in Tebas District. The purpose of the study is to determine the use of GIS web applications in monitoring agricultural activities. The research location focused on the Tebas Komplek agricultural area which is designated as a sustainable food agriculture area in Sambas regency which includes Tebas Sungai Village, Pangkalan Kongsi Village, Dungun Perapakan Village, Serumpun Buluh Village and Mekar Sekuntum Village. The research method used in this study used remote sensing and waterfall methods. The remote sensing method is used to build spatial data by using remote sensing imagery, while the waterfall method is used to build a home GIS web for spatial data to be placed. The technique of collecting data on attributes of agricultural activities is carried out by filling out questionnaires, while spatial data collection is carried out by interpreting satellite images and testing the accuracy and tracking of land in the field. The results of the study stated that: 1) A Web Gis application design has been composed which contains the home page, poktan data page, poktan detail page, whole rice field data page, member detail page, login page, poktan data input page, and rice field data input page; 2) The agricultural land system in Serumpun Buluh Village has its own uniqueness compared to Mekar Sekuntum village, Tebas Sungai, Dungun Perapaakan and Pangkalan Kongsi in Tebas Agricultural Area Complex, which uses an overlay system. Serumpun Buluh Village uses a domicile system, which is based on the domicile of farmers and some are based on the location of land owned by farmers; 3) There are differences in the variation in the area of poktan spatial data in each gappoktan located in the Tebas Complex Agricultural Area. The conclusion of the use of the gis web application will make it easier for extension workers and gapoctans to monitor agricultural activities in the Tebas Komplek agricultural area.

Geoecological effects of the outflow of 11-T Gunyushki geothermal well in the territory of the Chechen Republic

The purpose of the study is a geoecological assessment of the effect of groundwater flowing from geothermal wells through an energetically saturated coolant with its mineral component on natural and natural-economic components as well as on the structure of the entire enclosing landscape for the case of 11-T Gunyushki well of the Chechen Republic (Russia). The impact of the mineralized waters outflowing from geothermal wells on natural and natural-economic components and on the whole structure of the entire enclosing landscape is a challenging environmental problem for all oil and gas regions of Russia. Long-term outflow of thermal water from the well under consideration resulted in landscape trans-formation and suppression of the vegetation cover. Moreover, a stable source of pollution was formed in the place where untreated water from hand-crafted balneological facilities (baths, showers) was discharged that caused a radical restructuring of plant communities. The conducted research is based on the field data obtained by a team of authors on landscape mapping. Interpretation of high-resolution satellite images has shown the dynamics of landscape changes under the influence of thermal waters. The authors took water and soil samples and questioned local residents, which made it possible to adjust the scale and possibilities of using these waters. The research performed allowed to develop a physical-geographical profile, create a landscape map of the area affected by a geothermal well and an index map of the geoecological zoning of the area under investigation as well as identify the main types of the most transformed landscapes resulting from the combined impact of several anthropogenic factors (humidification and impact on the soil and vegetation cover). Conducted study has shown that more than 120 hectares of fertile lands were withdrawn from agriculture due to the anthropo-genic impact. The analysis of the index map of geoecological zoning demonstrates that 79 % of the territory is located in the zone of a weak indirect environmental impact, 7.14 % – in the zone of a strong indirect environmental impact, 13.5 % – in the zone of a strong direct environmental impact. The latter, requires reclamation in order to restore landscapes, since it undergoes desertification. Having performed a number of chemical analyses of water, the authors gave recommendations for the further use of thermal waters in the economy of the Groznensky region.

The Structural and Geomorphic Forms of Ranya Vicinity as Deduced from Satellite Images Data, Kurdistan Region, Northeast Iraq

The structural forms (folds and faults) in the Iraqi Kurdistan Region exhibit more complexity in the northern and northeastern parts of the region; accordingly, complicated geomorphic forms were developed too. This is attributed to the collision of the Arabian and Eurasian plates with a convergent boundary that runs about 35 – 40 km northeast of the studied area. Many long and tight anticlines exist in the studied area, the majority of them exhibit very complex forms, such as being faulted and their axes being bent. The main characteristic structural and Geomorphic recognized forms based on the interpretation of high-quality satellite images are: Domes, en-echelon plunges, overturned beds, faulted anticlinal and synclinal axes, abandoned and recent alluvial fans, water and wind gaps, wine glasses, and different valley shapes. The recognized structural forms are quite different from those previously presented on the geological maps of different scales, and the forms are good indications for the lateral growth of the anticlines. A Field check was carried out to check some ambiguous interpreted data and to confirm the new findings.

Using the Remote Sensing Method to Simulate the Land Change in the Year 2030

This is study is based with the support of RS-GIS technology on the land use of Samsun Center, as well as the coastal districts of Ilkadım,Atakum,Bafra Plain, through the processing and interpretation of satellite images in the summer months of 2000,2010,2020. Spatial and temporal variability properties of LU/LC were determined using MLC algorithm, controlled classification approach. The predictive values of the LU/LC change that will occur in 2030, calculated with the MLP‑ANN model based on Machine Learning algorithms and mapped with the QGIS 3.16 program. To determine the accuracy coefficient of the model, 2020 LU/LC simulation performed using the transition potential matrix of 2000 and 2010 LU/LC data. The results of simulation were compared the data of land use land cover with the 2020 to evaluate the accuracy of the simulation model. The model of MLP‑ANN provided an accuracy of 72% based on the kappa fit index. According to MLP‑ANN model 2030 results were an increase of 73.33 km² in built up areas, an increase of 56.89 km² in bare areas, and a decrease of 129.66 km² in green areas. It provided a reference basis for future Samsun urban to rural coastline LU planning and management and LU structure optimization.

Морфометрический анализ агроландшафтов переходной зоны южных черноземов и темно-каштановых почв Волгоградской области

This article presents the results of geoinformation cameral mapping and morphometric analysis of one of the types of agrolandscape - arable land in the Mikhailovsky district of the Volgograd region. The relevance of the study is due to the lack of statistical data regarding the areas and configuration of individual fields, as well as the rapid development of areas of application of geographic information systems and remote sensing data in agriculture. For mapping, the method of visual expert interpretation of multispectral Earth remote sensing data of high (Sentinel satellite images for 2021) and medium (Landsat satellite images for 1986) spatial resolution was used. For morphometric analysis, a digital elevation model “SRTM” with a height resolution of 10 m was used. All operations with raster and vector materials were carried out in the geoinformation environment “QGIS”, statistical processing of the obtained data was carried out in “MS Excel”. 2,248 fields were mapped, which are arable land and fallows, with a total area of 229.8 thousand hectares. It was revealed that the predominant spatial orientation of the fields is the southwestern and northeastern direction, the smallest area is occupied by fields with a southeastern orientation. The largest field area is located in areas with surface slopes up to 1.5°. The maximum slope is 4°. Based on the results of the work, maps-schemes of the exposition and the steepness of the slopes of the fields in the Mikhailovsky district were compiled. The used mapping method based on the interpretation of high-resolution satellite images showed high accuracy. The data obtained can be used as a basis for more detailed studies of arable land in the Mikhailovsky district, as well as for planning land reclamation measures.

Landslides and sinkholes of the karst environment in the vicinity of the Ufa river

Introduction. As a result of the conducted route reconnaissance and geological engineering surveys, data about the development pattern of exogenous processes at a site adjoining the city of Ufa were obtained. This region is well studied due to the extensively developed karst. Although landslides are less prevalent here, their development is frequently connected with the karst intensification. Landslides, formed in sites of sinkholes and topographic lowering, are well represented in other regions of the Russian Federation. Aim. To study the characteristics of landslide formation. In addition, the mechanism of forming landslides, confined to rock massif decompaction zones, is analysed.Materials and methods. A mechanism of landslide formation in the sites of karst development is proposed. The work is based on the analysis of the results obtained in previous researchers of 1997, 2013 and 2017, interpretation of satellite images, digital terrain model and topographic, geomorphological and engineering-geological maps, as well as reconnaissance surveys. The peculiarity of engineering-geological conditions makes it possible to study the formation and development of two exogenous processes simultaneously (karst and landslides) in the selected area. The area under study included the exit section of Ufa city along the slopes of the Solotchi and Ufa rivers. According to the law established by Bondarik, Pendin and Yarg in 2007, “...some geological processes prepare others, which, in turn prepare the next ones, etc. and, as a result, so-called cascade processes develop...”. Exogenous geological processes of karst and landslides, developing in one section of the geological massif, are considered.Results. The formation of cavities is confined to the tectonic fracturing, along whose surface underground waters flow into the depths of the rock massif. The hydrodynamic zonation varies in time with the substraction of a filler and a release of previously formed cracks, cavities and voids. As long as the vertical pressure in soils and layer bearing capacity remain stable, no deformation of the massif above the cavity is observed. As a result of the study, the process sequence was presented for consideration, as well as the assumption was made about the lateral repulse crack deforming the slope surface after the formation of a block at the depth.Conclusion. The formation of karst sinkholes was demonstrated to intensify landslide processes on the slope surface.

Sinjar Anticline Northwest of Iraq: A Tectonic Geomorphological Study

The Sinjar Anticline (Mountain) is an outstanding structural and geomorphic feature in the northwestern part of Iraq. The anticline is a double plunging with almost E – W trend dividing the gently rolling plain in which it is developed into two parts, Al-Jazira Plain in the south and Rabi’a Plain in the north. The Sinjar anticline is asymmetrical with steeper northern limb (45 – 80)° and gentler southern limb (15 – 25)°, its length is about 80 km, whereas the width ranges between (9.25 – 12. 5) km. The oldest exposed rocks belong to the Shiranish Formation, whereas the youngest rocks belong to the Fatha Formation. Different geomorphological and structural forms were observed through interpretation of satellite images, geological and topographical maps of different scales, beside field observations. Among those forms are: Abandoned alluvial fans, radial, inclined, and cross-shaped valleys, whale-back shape, wind gaps, and parasitic folds. All these forms are good indications about the lateral growth of the anticline. Neotectonic measurements were carried to estimate the rates of upward and downward movements. These estimations were performed by measuring the elevation of the contact between the Fatha (Middle Miocene) and Injana (Late Miocene) formations at different selected locations on both sides of the anticline. Keywords: Sinjar anticline, lateral growth, neotectonic movements, wind gap, abandoned alluvial fans

Statistical Analysis of the Potential of Landslides Induced by Combination between Rainfall and Earthquakes

This study analyzed the potential of landslides induced by the interaction between rainfall and earthquakes. Dapu Township and Alishan Township in Chiayi County, southern Taiwan, were included as study areas. From satellite images and the literature, we collected data for multiple years and time series and then used the random forest data mining algorithm for satellite image interpretation. A hazard index for the interaction between earthquakes and rainfall (IHERI) was proposed, and an index for the degree of land disturbance (IDLD) was estimated to explore the characteristics of IHERI under specific natural environmental and slope land use conditions. The results revealed that among the investigated disaster-causing factors, the degree of slope land use disturbance, the slope of the natural environment, and rainfall exerted the strongest effect on landslide occurrence. When IHERI or IDLD was higher, the probability of a landslide also increased, and under conditions of a similar IDLD, the probability of landslides increased as the IHERI value increased, and vice versa. Thus, given the interaction between rainfall and earthquakes in the study area, the effect of the degree of slope land use disturbance on landslides should not be ignored. The results of a receiver operating characteristic (ROC) curve analysis indicated that the areas under the ROC curve for landslides induced by different trigger factors were all above 0.94. The results indicate that the area in which medium–high-level landslides are induced by an interaction between rainfall and earthquakes is large.

Geomorphological Study of Sulaymaniyah Vicinity Using Satellite Images, Kurdistan Region, Iraq

Visual interpretation of satellite images is a very significant technique to recognize and interpret geomorphological features. We have used Esri World Imagery and Google Earth images to recognize geomorphological features at Pira Magroon, Surdash, and Azmar anticlines in Sulaymaniyah vicinity, Kurdistan Region, north of Iraq. The mentioned anticlines are outstanding geomorphological features in the Sulaymaniyah vicinity. The recognized and interpreted geomorphological features include: wine glasses, water gaps, wind gaps, abandoned and recent alluvial fans, different types of valleys, flat irons, karstification features …etc. All these features were discussed in detail with many images to show the discussed cases, most of the interpreted data and presented figures were never mentioned previously.

Road extraction through digital processing and visual interpretation of satellite images

Road extraction plays an important role in urban planning and city extension issues, as well as in road monitoring, traffic management and map updating. Technological advances may offer a wealth of data and techniques that could be implemented in road delineation and extraction, as well as in change detection projects. Among the various methods that have been developed for this purpose, remote sensing techniques and especially digital processing of satellite data could contribute significantly in this direction. This paper presents the study of a road network which concerns the city of Kastoria located in northwestern Greece and its surrounding area. The special character of the road network is closely related to the city’s cultural value which is depicted in its structure. Satellite images of various spatial resolutions were employed for digital processing. Landsat 8 imagery was used in order to detect and delineate the linear features through spatial enhancement, while Landsat 5 images were used to detect changes over time through visual interpretation. Semi-automatic techniques were applied to SPOTmaps products to extract the road network, while an object-oriented approach was applied to QuickBird imagery in order to combine the spatial components with spectral properties. Through semi-automatic digitization and object-oriented workflows, the export of the studied part of the road network in vector format was achieved, thus facilitating the process and reducing the required time. The resulted data are efficient in road network delineation and could be combined with other data for road maintenance and extension, change detection issues, as well as for cultural and touristic purposes.

Distribution of large- and medium-scale loess landslides induced by the Haiyuan Earthquake in 1920 based on field investigation and interpretation of satellite images

Abstract Studying the distribution law and influencing factors of coseismic landslides has important scientific significance and engineering value for understanding the mechanism of seismic landslides and predicting the occurrence of seismic landslides. After a hundred years, these large- and medium-scale landslides induced by the 1920 Haiyuan earthquake are still well-preserved and have extremely high academic research value. About 620 loess seismic landslides induced by the Haiyuan earthquake in 1920 were investigated on site. On this basis, the shape differences between seismic landslides and gravity landslides were summarized; 605 landslides were identified by satellite images, and the Haiyuan earthquake-induced loess landslide database containing seismic information and landslide information was established. The distribution law and morphological characteristics of large- and medium-sized landslides induced by the Haiyuan earthquake were systematically counted according to the conditions of the landslide-intensive area, intensity, and fault upper and lower plates. The influencing factors of loess earthquake landslides were summarized, and the following conclusions were obtained: (1) 1,225 large- and medium-sized landslides were induced by the Haiyuan earthquake in 1920. These landslides have the characteristics of long sliding distance, large single scale, and strong disaster-causing. They are mainly distributed in three concentrated areas of Xiji, Haiyuan, and Pengyang. The landslide morphological characteristics of the three landslide-intensive areas are different because the landslide sliding mechanism caused by topography and lithology is different. (2) The landslide distribution has obvious clustering, zonation, and directivity, and has an obvious river distance effect and fault hanging wall effect. (3) The internal influencing factors such as stratum lithology, topography, fault location, and direction, and the role of water control the occurrence location and scale of landslide. The external factor of an earthquake is an important incentive and control factor for landslide occurrence.

The large deep-seated landslide induced by the March 12th, 2012 rainfall event in the city of Azazga, Northern Algeria: deformation characteristics and failure mechanisms

A rainfall-induced deep large landslide occurred on March 12, 2012, in the city of Azazga (Northern Algeria), causing heavy damages to residential buildings and public infrastructures. In this work, we investigate the inventory mapping, the deformation characteristics, the controlling factors, and the failure mechanisms of this landslide based on the field investigation, aerial photographs and satellite images interpretation, deep boreholes equipped with piezometers and inclinometers, as well as subsurface geophysical imaging by electric resistivity tomography (ERT). The obtained landslide inventory map shows that the landslide of March 2012 affected an area of 0.40 km2. This landslide is considered as a partial reactivation of a large pre-existing one (0.606 km2), which represents 6.65% of the total urban area. Moreover, the analyses identified two types of causative factors: (1) the triggering factor related to the high intensity and antecedent rainfall as well as human activity through slope excavations and embankments; and (2) the susceptibility factors related to the lithological nature and the internal structure of the flysch deposits, their weak mechanical resistance characteristics, the presence of shallow aquifers, and basal undercutting erosion of the Iazoughen and Aboud river torrents. The inclinometer measurements and ERT imaging reveal a complex, deep-seated and rapidly moving landslide whose failure surfaces are located at a depth of 11–29 m with an average velocity of 1–29 cm year−1. The entire slip surface is located along the geotechnical interface between the flysch bedrock and the overlying scree. This comprehensive study provides useful information on rainfall-induced landslides and may constitute guidance for landslide hazard mitigation and prevention.

Development of a geospatial database of tailing storage facilities in Australia using satellite images.

Tailings storage facilities (TSFs) are the main source of pollution from mining operations. However, TSFs are increasingly being considered as the potential secondary sources of some critical minerals. Recovering the critical minerals from TSFs is important due to both environmental and economic implications. Yet, identification of the potential TSFs is the major challenge in this venture due to the lack of publicly available database of TSFs. The objective of this study was to identify the TSFs and document their status in the form of a database for Australia. Visual inspection and interpretation of satellite images in Google Earth were used to identify the TSFs in 6 states and the publicly available database of TSFs for Western Australia (WA) was validated in this study to incorporate into a national-level database. This study has identified 331 active and 759 inactive TSFs in Australia. Among the sites, 42 active and 56 inactive mine sites with TSFs were found within 2km of urban centres in the studied states. Coal and gold were the major commodities of 27% of active mine sites with the TSFs and 38% of inactive mine sites with TSFs, respectively. Approximately 16% of active mine sites with TSFs and 28% of inactive mine sites with TSFs were found to process copper as a major commodity. Considering the companionability matrix, many of these TSFs could be explored for the possible recovery of critical minerals (e.g. rare earth elements, cobalt). This study has developed a national-level database of TSFs for Australia for the first time, and it could be used for a number of applications.

Maintaining Carbon Storage Does Not Reduce Fish Production from Mangrove-Fish Pond System: A Case Study in Coastal Area of Subang District, West Java, Indonesia

Deforestation and degradation of mangrove forests can be categorized as key environmental problems in Indonesia. These problems are majorly driven by overexploitation and the conversion of mangroves into brackish water aquaculture areas. One of the most common aquaculture systems traditionally developed in the coastal areas is the mangrove-fish pond system that combines fish production with existing trees. This study aims to analyze the environmental and economic aspects of mangrove-fish pond aquaculture in different levels of mangrove cover in the coastal area of Subang District, West Java, Indonesia. The spatial analysis method was used to analyze mangrove distribution and identify the current coverage in the aquaculture area. The economic aspect was analyzed, based on the costs and revenue from fish production, while the environmental aspect was represented by carbon storage, which is among the crucial mangrove ecosystem services. This study estimated carbon storage in the four-carbon pools: above- and below-ground biomass, deadwood, and litterfall. Based on the combination of visual interpretation of Sentinel 2A satellite images and field observations, approximately 667 ha of mangrove-fish pond was identified. This study found that there were no significant differences in fish production and net income from mangrove-fish pond aquaculture at various levels of mangrove cover. Meanwhile, the ponds with high mangrove cover stored higher carbon than those with medium and low mangrove covers. This indicates that maintaining carbon storage does not reduce fish production from mangrove-fish pond aquaculture.

Distribution and Mobility of Coseismic Landslides Triggered by the 2018 Hokkaido Earthquake in Japan

At 3:08 on 6 September 2018 (UTC +9), massive landslides were triggered by an earthquake of Mw 6.6 that occurred in Hokkaido, Japan. In this paper, a coseismic landslide inventory that covers 388 km2 of the earthquake-impacted area and includes 5828 coseismic landslides with a total landslide area of 23.66 km2 was compiled by using visual interpretations of various high-resolution satellite images. To analyze the spatial distribution and characteristics of coseismic landslides, five factors were considered: the peak ground acceleration (PGA), elevation, slope gradient, slope aspect, and lithology. Results show more than 87% of the landslides occurred at 100 to 200 m elevations. Slopes in the range of 10~20°are the most susceptible to failure. The landslide density of the places with peak ground acceleration (PGA) greater than 0.16 g is obviously larger than those with PGA less than 0.02 g. Compared with the number and scale of coseismic landslides caused by other strong earthquakes and the mobility of the coseismic landslides caused by the Haiyan and Wenchuan earthquakes, it was found that the distribution of coseismic landslides was extremely dense and that the mobility of the Hokkaido earthquake was greater than that of the Wenchuan earthquake and weaker than that of the Haiyuan earthquake, and is described by the following relationship: L = 18.454 ∗ H0.612. Comparative analysis of coseismic landslides with similar magnitude has important guiding significance for disaster prevention and reduction and reconstruction planning of landslides in affected areas.

Kajian Tingkat Kesesuaian Penggunaan Lahan Terhadap Rencana Tata Ruang Wilayah dalam Upaya Mitigasi Bencana di Kecamatan Baturraden Kabupaten Banyumas

Land use suitability aims to align land use with the development planned by the government as stated in the Regional Spatial Plan. Baturraden District has an area of 4550.76 Ha. This study aims to determine the level of suitability of land use to RTRW in disaster mitigation efforts in Baturraden District, Banyumas Regency. This research is a descriptive research using field survey methods (field research) and geospatial analysis approaches to conduct spatial analysis of land use suitability to RTRW. The population in this study is in the form of land use forms. The sampling technique for land use forms in this study was to use the total sampling technique. The types of data used in this study are secondary data in the form of Landsat Imagery, RBI Map scale 1:25,000 and Banyumas Regency RTRW Map scale 1:40,000. The data collection used is in the form of field observations, interpretation of satellite images, and documentation. Secondary data processing is carried out by overlaying between the Baturraden District Land Use Map and the Banyumas Regency RTRW Map. Data analysis uses qualitative descriptive to explain the degree of suitability of land use to RTRW. The results of this study show that the level of land use suitability of Baturraden District in 2021 is divided into 2 classifications, namely the appropriate and non-appropriate levels. The area in accordance with the RTRW is 2813.18 Ha (61.81%), while the area is not in accordance with the RTRW which is 1737.57 Ha (38.18%). The value of land use suitability in Baturraden District is in the appropriate category (51-100%). Land use suitability is included in the pre-disaster stage, the level of land use suitability is included in the appropriate classification, it is more effective to realize the resilience of the territory from disasters.