Peruvian Altiplano Research Articles

Lower–Middle Ordovician brachiopods from the Eastern Cordillera of Peru: evidence of active faunal dispersal across Rheic and Iapetus oceans

AbstractNew Floian and early middle Darriwilian brachiopod assemblages of the San José Formation of the Eastern Cordillera of Peru are presented. A new genus and species, Apurimella santiagoi, and two new species, Phragmorthis henrylunae and Nocturnellia ashaninka, are described. The assemblages also contain additional characteristic taxa demonstrating links with other proto‐Andean localities (Peruvian Altiplano, Argentinian Eastern Cordillera, Famatina) as well as with some localities of Baltica (Estonia, Ingria, Norway), Ganderia (Anglesey, Tramore, Indian Bay, Summerford, Miramichi), peri‐Laurentia (Mayo, Svalbard) and Laurentia (Klamath Mountains). Those shared genera indicate dynamic faunal exchanges between the Peruvian Eastern Cordillera and these terranes during the Early–Middle Ordovician transition, suggesting active brachiopod dispersal mechanisms across the Rheic and Iapetus oceans. These connections seem to have still been active by the middle Darriwilian, as suggested by the presence of Phragmorthis in the Darriwilian assemblages of Cuyania and Laurentia. Similarly, the new Peruvian Nocturnellia species is of particular interest, given that this genus is likely to have originated in South China during the Floian, but extended its distribution to Avalonia and to high‐latitude peri‐Gondwana by the Dapingian. It thrived there until the middle Darriwilian, but by that time had also reached the proto‐Andean margin either via Avalonia across the Rheic Ocean or along the Gondwanan coast from high‐latitude settings. All of these occurrences improve our knowledge of Early–Middle Ordovician brachiopod faunas of the northern Central Andean Basin and their relationships with contemporaneous faunas worldwide.

Tutoring and Academic Performance in University Students from the Peruvian Altiplano

Objective: University tutoring is crucial to support students' academic, personal and professional success, provides individualized guidance, fosters the development of key skills and promotes student retention, thus contributing to the overall growth of university students. Within this framework, the objective of the research was to determine the relationship between the perception of the tutoring system and the academic performance of students of the National University of the Altiplano of Puno (UNAP). Methods: The research approach is quantitative, non-experimental, with a cross-sectional correlational design. The population consisted of 474 students, obtaining a sample of 213 randomly selected students. A questionnaire was used to measure the first variable, while for the second variable the minutes of evaluation corresponding to the first academic semester of the year 2023 were consulted. Results: The results reveal that students of the UNAP have a regular perception of tutoring services, both academic and personalized. While they recognize the existence of these services, they are not fully familiar with all available services. Some students have also used these services occasionally, do not consider them an essential part of their university experience and do not actively seek this type of support, except when they need it. Conclusion: In conclusion 93.4% of the students assessed the tutoring system as regular, while 6.6% considered it bad or unsatisfactory. In addition, the statistical analysis reveals a strong positive correlation (r=0.795) between the tutoring system and academic performance, supported by a p value lower than the level of significance (0.00 < 0.05) that confirms the statistical validity of this relationship. These findings suggest that as the tutoring system strengthens, there is a considerable and positive association with students' academic performance.

Atmospheric Aerosols and Air Quality in the 2022 Dry Season in Huancayo-Perú

This work presents results of Aerosol Optical Depth (AOD) and Direct Radiative Force (DRF) at the top of the atmosphere (TOA), obtained during monitoring campaigns carried out at the Huancayo Observatory of the Geophysical Institute of Peru (OH-IGP ) in April and August 2022. In these campaigns, a Sun CIMEL photometer was used to measure the microphysical and optical properties of aerosols at wavelengths ranging from 340 to 1020 nm, and a low-cost Purple-air sensor to quantify the concentration of material particulate (PM), in fine and coarse modes. The AOD results indicated values in the range 0.06-0.22. The daily averages of PM2.5 and PM10 did not exceed Peru's current Environmental Quality Standards (50 μg/m3 and 100 μg/m3). The air quality index (AQI) calculated for PM2.5 and PM10 was classified as good. On some days during the campaigns, the air quality was classified as moderate. These results contribute to a better understanding of the current climatic conditions of the Peruvian Altiplano.

Courtship behavior and breeding phenology of Andean Lapwing (Vanellus resplendens) in the Peruvian altiplano

Courtship behavior and breeding phenology of Andean Lapwing (Vanellus resplendens) in the Peruvian altiplano

Evaluating the Yields of the Rainfed Potato Crop under Climate Change Scenarios Using the AquaCrop Model in the Peruvian Altiplano

Ensuring global food security and adapting to the challenges posed by climate change, particularly in rainfed agriculture, are paramount concerns. This research investigates the impacts of climate change on the yield of the potato crop variety Imilla Negra (Solanum tuberosum spp.) under the extreme climatic conditions of the Peruvian Altiplano. From the experimentation in six crop plots under a rainfed agricultural system, periodic crop growth parameter measurements were obtained from 2017 to 2018. The results showed a good performance of the AquaCrop model in the calibration and validation, successfully simulating crop growth and yield parameters. Climate projections showed precipitation decreases and temperature and evapotranspiration increases for the representative concentration pathway (RCP), RCP 4.5, and RCP 8.5 scenarios in 2023–2050. A comparison of crop yields between the base period (2006–2021) and the period 2023–2037 showed no significant changes, whereas a more considerable decrease was observed for the period 2038–2050. It is concluded that climate change generates moderate impacts on potato crop yields under the rainfed agricultural system in the Peruvian Altiplano due to the average reduction in precipitation.

La despensa nacional: Quinoa and the Spatial Contradictions of Peru’s Gastronomic Revolution

AbstractThis article explores the spatial politics of Peru’s gastronomic revolution and corresponding efforts to territorialize Peruvian agricultural products by tracing the spatial dynamics of quinoa’s trajectory from highland dietary staple to coveted national food. Efforts to codify Peru’s national cuisine have involved mapping ingredients and dishes onto specific regions while dramatically reshaping agricultural production geographies and culinary topographies. Because of quinoa’s success as a high-value export crop, the Peruvian altiplano is no longer perceived as a landscape useful exclusively for livestock pasture and mining. Instead, it is imagined as agriculturally productive: the country’s quinoa heartland. At the same time, quinoa’s trajectory illuminates spatial contradictions in the gastronomic boom’s purported objectives and its tangible effects. The revalorization of quinoa led to a geographical expansion of its production outside the high Andes, undermining the spatially bound concepts of authenticity promoted by gastronomic leaders in Peru. Broadly, efforts to commercialize marginalized food products and their corresponding regions can at once reconfigure territorial discourses in important ways, reinforce long-standing geographical inequalities, and generate contestations of the geographic imaginaries of food and nation.

Knowledge Management: The Siku, an Aboriginal Aymara Ethnic Group and Cultural Heritage of the Andean Highlands

Objective: The study aims to apply the models proposed in Knowledge Management (KM) for the rescue of the cultural heritage of the Siku instrument, with the Peruvian Altiplano as a scenario. Theoretical Framework: The siku originates from the Aymara people and is a cultural manifestation rooted in the Andean highlands. It is considered a gift from Mother Earth and symbolizes the connection between the human being and the sounds it emanates. Method: The methodological approach was approached from a qualitative perspective, using the ethnomethodological method through an inductive approach. We worked with two groups of participants, the first one composed of four members of the Conjunto de Arte y Folklore Sicuris "Juventud Obrera", who are considered heirs of the Aymara tradition; and the second one was constituted by six young people from the urbanization El Progreso, who reflected on the meaning of the cultural heritage of the native peoples in the Andes. Results: The results are presented in two categories: a) diagnosis, b) final assessment, where a real socio-critical transformation mediated by adequate QA can be observed. Conclusions: It highlights on a large scale the role of the Siku as an aboriginal Aymara ethnic group and cultural heritage of the Andean Altiplano; likewise, by way of projection, three essential questions stand out, which are: what measures can the State take to rescue Peru's ancestral traditions? What programs can be developed through education so that society appropriates the millenary cultural heritage? Could this experience be replicated in other aboriginal communities with other thematic approaches?

Extreme Droughts and Their Relationship with the Interdecadal Pacific Oscillation in the Peruvian Altiplano Region over the Last 100 Years

The Peruvian Altiplano Region (RAP) is a high plateau area surrounded by the Western and Eastern Andes mountain ranges. This study examines the relationship between extreme droughts in the region and the interdecadal Pacific Oscillation (IPO) over the past century. Previous research has shown that precipitation patterns in the region follow a decreasing trend, with systematic increases in precipitation on the western slope and decreases in the eastern, southern, and central parts. The temporal and spatial variability of precipitation in the Altiplano region is influenced by the easterly moisture flux and the interaction between the El Niño Southern Oscillation (ENSO) and below-average values. The study utilizes water level data for Lake Titicaca and IPO data from 1914 to 2015. The analysis employs wavelet transform and empirical orthogonal function (EOF) techniques to identify the relationship between water levels and IPO. The results indicate multidecadal variability in water levels associated with El Niño/La Niña events and the IPO. The negative phase of the IPO aligns with extreme drought periods, suggesting a connection between the IPO climate index and drought events. The EOF analysis shows a moderate positive correlation between water levels and IPO. The findings highlight the importance of considering IPO and its interaction with ENSO in understanding drought patterns in the Altiplano region. However, other atmospheric conditions also influence precipitation in the region. The study contributes to a better understanding of the factors affecting water levels and droughts in the Peruvian Altiplano, with implications for water resource management in the region.

Gender of language contact

This article considers how language contact is gendered through an analysis of how inter-Indigenous Quechua–Aymara boundary maintenance practices and ideologies are feminised in the Peruvian altiplano. The analysis focuses on the semiotic regimentation of Indigenous ethnolinguistic boundaries, concentrating on the role of four Indigenous female figures: the Indigenous wife; the Indigenous female market vendor; the reimagined mythic Indigenous founding mother; and the Indigenous beauty pageant contestant. An ethnographically grounded, scalar analysis of Quechua–Aymara contact in the region shows how each of the female figures is ideologically linked to a specific aspect of inter-Indigenous language contact and boundary maintenance. Furthermore, the discussion shows the interconnectedness of these female figures and their associated ideologised practices and discourses, which lead to the feminisation of inter-Indigenous language contact in the region.

Improvement of Hargreaves–Samani Reference Evapotranspiration Estimates in the Peruvian Altiplano

The FAO 56 Penman–Monteith equation (PM) is considered the most accurate method for estimating reference evapotranspiration (ETo). However, PM requires a large amount of data that is not always available. Thus, the objective of this study is to improve the Hargreaves–Samani (HS) reference evapotranspiration estimates in the Peruvian Altiplano (PA) by calibrating the radiation coefficient KRS. The results show modified HS (HSM) ETo estimates at validation after KRS calibration, revealing evident improvements in accuracy with Nash–Sutcliffe efficiency (NSE) between 0.58 and 0.93, percentage bias (PBIAS) between −0.58 and 1.34%, mean absolute error (MAE) between −0.02 and 0.05 mm/d, and root mean square error (RMSE) between 0.14 and 0.25 mm/d. Consequently, the multiple linear regression (MLR) model was used to regionalize the KRS for the PA. It is concluded that, in the absence of meteorological data, the HSM equation can be used with the new values of KRS instead of HS for the PA.

Uniformity of water distribution in sprinkler irrigation mini-cannons in a high Andean community in Peru

The objective of the present work was to determine the uniformity of water distribution through mini-irrigation cannons in conditions of the Peruvian altiplano, applying the formulas for the Christiansen Uniformity Coefficient (CUC) and the Distribution Coefficient (DU) and to interpret the incidence of wind on water distribution at three different times during the day (5:30-7:30, 12-14 and 16-18 hours). Necessary climatological information, field rainfall tests, emitter pressure, and flow, wind speed were collected to evaluate their influence on water application. Variable CUC and distribution uniformity results were obtained at the level of four demonstration plots, the maximum and minimum CUC was 87.42% and 55.34%, while the DU resulted with a maximum of 80.79% and 26. 88% minimum; it is worth mentioning that in the last two schedules, results were obtained that show a poor water distribution; while winds less than 2 m/s favored the uniform distribution of water applied through the sprinklers, affirming that it was possible to obtain an acceptable water distribution uniformity at the plot level considering the irrigation schedule.

Antianemic activity of quinoa (Chenopodium quinoa Willd) Collana Negra variety and kanihua (Chenopodium pallidicaule Aellen) Ramis variety seed flour in anemic rats

The Andean grains from the Peruvian Altiplano, quinoa (Chenopodium quinoa Willd) and kanihua (Chenopodium pallidicaule Aellen) have high protein content and an optimal balance of essential amino acids and minerals such as iron (19.8 mg/100 g y 17.6 mg/100 g, respectively). The objective of this research was to evaluate the antianemic activity of extruded flour from quinoa seeds variety Negra Collana and kanihua variety Ramis in anemic Holtzman strain rats. The results of the proximal analysis showed high protein content in quinoa at 22% and kanihua at 16.2%, and the acute toxicity test showed harmlessness up to the dose of 15000 mg/Kg in both flours confirmed with the anatomopathological observation of organs such as liver, stomach, lung, kidneys, and brain. In the evaluation of the antianemic activity, a basal average of 29.3 ± 0.2% of hematocrit was observed in the group of anemic rats treated with quinoa flour, and in twelve weeks, it increased to 53.8 ± 0.3% of hematocrit (p ≤ 0.05). A group of anemic rats treated with kanihua flour had a basal average of 29.5 ± 0.3%, and in twelve weeks, it increased to 51.7 ± 0.3% (p ≤ 0.05). A group of rats without anemia treated with quinoa and kanihua flour showed a basal average of 50.2 ± 0.2% and 49.3 ± 0.3%; in twelve weeks, it increased to 55.2 ± 0.2% and 54.8 ± 0.1%, respectively. It was concluded that oral administration of 360 mg/Kg every 24 h of quinoa flour and kanihua flour increased hematocrit levels by 24.5 ± 0.5% and 22.2 ± 0.3%; weight 65.8 ± 0.3 g and 59.2 ± 0.1 g; height 6.8 ± 0.1 cm and 5.7 ± 0.5 cm, respectively (p ≤ 0.05). In rats without anemia increased hematocrit levels by 5.3 ± 0.0% and 5.5 ± 0.0%; weight 37.7 ± 0.1 g and 21.7 ± 0.05 g; height 4 ± 0.0 cm and 3.9 ± 0.0 cm, respectively (p ≤ 0.05).

Cultivos de cobertura asociados a quinua (Chenopodium quinoa Willd) en el Altiplano peruano: Reducción de la erosión, mejora de la salud del suelo y rendimiento agrícola

The Peruvian Altiplano presents increasing fertility losses, being susceptible to natural erosion. For many years, conventional agricultural management has generated losses of the topsoil and deterioration of soil properties, impacting in crop yields and deepening the degradation of this vulnerable ecosystem. The aim of this research was to determine the benefits of cover crops against erosion, soil health and quinoa yield. The trial was carried out in Huancarani and Cahualla towns, Mañazo district, Puno; with a randomized complete block design (RCBD) with four treatments: without cover and with clover (Medicago hispida G.), vetch (Vicia villosa) and mulch covers. We evaluated the physical, chemical, and biological characteristics of soil, the biomass of the cover crops and the quinoa yield. The results showed that the treatments with clover, mulch and vetch covers reduced soil erosion by 59.61%, 51.87% and 49.50%, respectively. Likewise, the use of clover and vetch covers increased organic carbon (29.71% and 31.16%), nitrogen (36.94% and 48.65%), and available phosphorus with clover cover (26.11%). Finally, clover cover associated with quinoa increased the yield of quinoa grain by 17% and reduced soil erosion significantly. These results show that cover crops have great potential for restoring soil health and improving yield.

Assessment of the hydrological response to precipitation and temperature changes in the Peruvian Altiplano

Assessment of the hydrological response to precipitation and temperature changes in the Peruvian Altiplano

Classification, technical efficiency, and economic performance of producers in the main productive region of quinoa in Peru

Classifying small agricultural producers based on their technical efficiency and economic performance allows us to gauge the potential to improve yield in the quinoa crop, promote local food security, and improve rural incomes. Consequently, the objective of this study was to characterize and classify quinoa producers at the Peruvian Altiplano based on their productive, economic, and social attributes, so the technical efficiency and economic performance of the identified groups can be analyzed. Hence, 409 surveys conducted among quinoa producers in the Puno region were used to run the statistical analysis using two-stage cluster techniques, stochastic frontier, linear regression, and ANOVA tests. The results revealed that three groups of producers exhibited discriminating variables in the use of fertilizers, organic fertilizers, weed control, application of fungicides, production of quinoa, the total area of all crops, and achievement of economic benefits. It was evidenced that the use of seeds and fertilizers, in optimal quantities, increased yield, and in combination with quinoa sales, were the significant variables to differentiate technical efficiency. The high Andes are characterized by smallholdings, subsistence agriculture and, agrobiodiversity conservation and, although cultivation practices are predominantly low technical efficient, it would be possible to rapidly increase agricultural performance with a better allocation of external inputs. However, this could be done to regional limits, for this reason, the role of public policy is very important so that producers can get broader access to production inputs and technical services.

Characterization of expansive soils for the foundation of an irrigation canal in the Peruvian Andes, Cabana-Mañazo case

Alterations in water content in swelling soils cause volume variation, which implies constructive, socioeconomic and environmental damage. This paper characterizes the swelling soil located in an irrigation canal of the Peruvian Altiplano and its behavior of the properties by addition of lime in 5, 10, 15 and 20% of the total weight. Finding that the sample of the station 6+575 has combined presence of montmorillonite clays in a percentage of 13.52% together with the group of kaolinites in a percentage of 1.31%, consequently, it makes expandable clay of high plasticity. The soils of the station 6+250 have the characteristics of kaolinite clay, which distinguishes it as having low plasticity. In the swelling tests the high expansiveness was found, in the station 6+575, which has decreased with the addition of lime. Considering that concrete canals are generally of small thickness it would be important to consider the slightly dangerous effects on irrigation infrastructure.

The upper Oligocene San Rafael intrusive complex (Eastern Cordillera, southeast Peru), host of the largest-known high-grade tin deposit

The upper Oligocene San Rafael intrusive complex (SRIC), located at the southwest margin of the Eastern Cordillera of southeast Peru, is an exceptional case study to investigate the petrogenesis of a large composite granitic pluton associated with the largest known high-grade Sn deposit (>1 Mt. Sn). The granitic rocks are quasi-continuously exposed over more than 1.4 km vertically, from the cupola at surface to deeper levels in the underground mine workings, thus providing access to the upper part of a large pluton. We describe new field relationships and petrographic observations of the main granite varieties of the SRIC, and we report quantitative mineral analyses, whole rock geochemistry (major and trace elements, radiogenic Sr, Nd, and Pb isotopes), and in situ UPb dating and trace element analysis of zircons. The SRIC is dominantly composed of a biotite-cordierite -bearing K-feldspar megacrystic granite, which contains comagmatic enclaves and dismembered dikes of fine-grained and medium-grained granites, and subordinate lamprophyres. While the granitic rocks are widely affected by variable degrees of pervasive hydrothermal alteration, the least altered samples are characterized by moderately fractionated peraluminous S-type compositions, with similar enrichments in incompatible elements (Li, B, Ga, Rb, Sn, Cs, Th, and U), relatively high Zr/Hf and Nb/Ta ratios, and strongly crustal Sr, Nd, and Pb isotopic signatures. In situ UPb dating and trace element analysis of zircons indicate that the granitic magmas crystallized contemporaneously within age uncertainty at 24.02 ± 0.25 Ma (megacrystic granite), 24.17 ± 0.28 Ma (fine-grained granite), and 24.26 ± 0.26 Ma (medium-grained granite) at Ti-in-zircon temperatures from 638° to 840 °C (avg = 759 ± 49 °C). The lamprophyres have high contents of lithophile elements (Li, Rb, Cs, Sn, W) while showing more primitive SrNd isotopic compositions, indicating a metasomatized subcontinental lithospheric mantle source contaminated by crustal assimilation and/or mixing with granitic magmas. Tin contents of the main San Rafael granites are moderate (3–40 ppm; avg. = 13 ppm Sn) and fall in the same range of values as reported for “tin granites” from the Central Andean tin belt. Based on our petrological and geochemical data, we conclude that the SRIC results from multiple injection and mingling/mixing of several types of coexisting felsic and mafic magmas in a shallow-crustal reservoir. The granitic magmas were largely derived from partial melting of metasedimentary protoliths and hybridization with mantle-derived mafic melts, in a regional geodynamic setting dominated by anomalous asthenospheric heat flow beneath the southern Peruvian Altiplano during the Oligocene to Miocene. Based on the moderately fractionated peraluminous character of the SRIC, we conclude that the granitic pluton was a passive host for Sn mineralization and only provided the structural focusing for metal-rich magmatic fluids derived from a deeper part of the granitic magma reservoir. We propose a model in which the injection of high-temperature mafic melts into a more reduced, fractionated granitic magma reservoir triggered late-magmatic oxidation, crystal mush reactivation, and exsolution (second boiling) of metal-rich magmatic fluids. The latter ascended toward the upper part of the crystallized granitic pluton and were focused along subvertical dilational structures, where they cooled down and mixed with downwelling meteoric waters, thus generating the world-class San Rafael Sn (Cu) deposit.

Antimicrobial peptides purified from hydrolysates of kanihua (Chenopodium pallidicaule Aellen) seed protein fractions

The kanihua (Chenopodium pallidicaule Aellen) Andean grain from the Peruvian Altiplano presents proteins of 15% to 19%. The objective was to obtain purified bioactive antimicrobial peptides (AMPs), hydrolyzed with Alcalase and Pepsin-pancreatin sequential system of protein fractions of kanihua varieties Ramis (KR) and Cupi-Sayhua (KS), and hydrolysates with different degrees of hydrolysis (DH) and percentage inhibition (IP) of the growth of E. coli, S. aureus, and C. albicans. To obtain AMPs, nutraceuticals, bio-preservatives, and novel ingredients in food design. The results showed 216 hydrolysates (1%, w/v), only 28 presented significant difference compared to controls (IP ≥ 45%, p ≤ 0.05), 4 AMPs were purified by chromatography, glutelins KS 4 h (1:10) stood out with DH 40% and IP 52% and 70% of S. aureus and C. albicans, respectively (p ≤ 0.05), showed minimum inhibitory concentration (MIC) of 95% for E. coli (p ≤ 0.05), and presented an anionic charge. In conclusion, the simulated digestion in vitro showed higher DH (7%–67%) than Alcalase (13%–54%); the majority were extensive; of 28 hydrolysates with IP ≥ 45% 4 AMPs with important IPs were obtained, and one was anionic.

Valuing meteorological services in resource-constrained settings: Application to smallholder farmers in the Peruvian Altiplano

Changing climate and weather patterns have resulted in reduced agricultural productivity in some parts of the world and put pressure on global food security. Availability and improved quality of meteorological information is seen as a potentially propitious means of adaptation to changing climate conditions. Forecasts of extreme weather events are especially valuable in resource-poor settings where climate-related vulnerability is high, such as for smallholder farmers in low-income countries. In this paper we provide estimates of frost warnings valuation in the context of small-scale quinoa production in the Peruvian Altiplano using a cross-disciplinary approach. We first present a detailed contextual assessment of quinoa production in the study region based on agrometeorological and socio-economic data that was obtained through a representative farm household survey conducted in December 2016. Building on this assessment, we propose a stochastic life-cycle model, replicating the lifetime cycle of a quinoa-producing household, in order to derive a theoretical valuation of frost warnings. Calibrating the model to our data we provide estimates of frost-warning valuation which are in the range of $30–50 per household per year, depending on the forecast accuracy and agents’ risk aversion. In a last step, using the observational data from the farm household survey, we show that access to existing meteorological services is empirically associated with avoided losses in agricultural production that amount to $18 per average household and per year. Our findings point to high climate vulnerabilities of smallholders in the Peruvian Altiplano and potentially large welfare gains from incorporating improved meteorological services into their decision-making process. At the same time, we highlight that attention must also be paid to complementary non-meteorological interventions that bear the potential to leverage these welfare gains.

Earthquake surface ruptures on the altiplano and geomorphological evidence of normal faulting in the December 2016 (Mw 6.1) Parina earthquake, Peru

The 2016 Mw 6.1 Parina earthquake ruptured a shallow-crustal normal fault within the high Andes of south Peru. We use high-resolution DEMs and field mapping of the surface ruptures generated by the earthquake, in combination with co-seismic and post-seismic InSAR measurements, to investigate how different features of the geomorphology at Parina are generated by the earthquake cycle on the Parina Fault. We systematically mapped 12 km of NW-SE trending surface ruptures with up to ~27 cm vertical displacement and ~25 cm tensional opening along strike, separated by a gap with no observable surface ruptures. Co- and post-seismic InSAR measurements require slip below this gap in surface ruptures, implying that surface offsets observed in paleoseismic trenches may not necessarily be representative of slip at seismogenic depths, and will typically yield an underestimate of paleo-earthquake magnitudes. The surface ruptures developed along 10–20 m high cumulative scarps cutting through late Quaternary fluvio-glacial deposits and bedrock. The 2016 Parina earthquake did not rupture the full length of the late Quaternary scarps, implying that the Parina Fault does not slip in characteristic, repeat earthquakes. At Parina, and across most of the Peruvian Altiplano, normal faults are most-easily identified from recent scarps cutting late Quaternary moraine crests. In regions where there are no recently-deposited moraines, faults are difficult to identify and lack time constraints to quantify rates of fault slip. For this reason, current fault maps may underestimate the seismic hazard in the Altiplano.