Abstract
The Sulawesi earthquake with a moment magnitude of Mw 7.5 struck the Central Sulawesi region of the Sulawesi Island, Indonesia, on September 28, 2018. The epicenter of the earthquake was located in the mountainous region of Donggala Regency, in the neck of the Minahasa Peninsula in the Central Sulawesi Province of Indonesia. Although the epicenter was located in Donggala Regency, the greatest devastating effects were observed about 70 km south of the epicenter in the Palu Valley. The event was the first of its kind to cause large-scale flowslides simultaneously at four key locations such as Balaroa, Petobo, Jono Oge, and Sibalaya with extensive ground displacements ranging from several hundred meters to more than 1 km. This article reviews the field observations of geotechnical failures and infrastructure damage caused by liquefaction resulting from the shallow strike-slip earthquake at Palu City, Donggala Regency, and Sigi Regency. A geo-spatial analysis was performed on data collected from aerial drone imagery, along with portable dynamic cone penetration testing (PDCPT) in the field. The investigation revealed a highly stratified ground with alternating soil layers of varying permeability and very low bearing resistance at shallow depths. The investigation also helped in assessing the extent of damage caused by geotechnical failure to the residential infrastructures, irrigation structures, and roads.Graphical
Highlights
Located along the Ring of Fire, Indonesia constantly experiences turbulent tectonic activities such as earthquakes, volcanoes, and tsunami
The soil profile of the failed areas was thoroughly examined using the trenches excavated on site, and soil samples were collected from various elevations in the trenches
3 Conclusions This paper provides an insight into the outcomes of the forensic geotechnical survey conducted aftermath of the 2018 Sulawesi earthquake
Summary
Located along the Ring of Fire, Indonesia constantly experiences turbulent tectonic activities such as earthquakes, volcanoes, and tsunami. The Sulawesi earthquake triggered large-scale landslides and liquefaction at several locations in the Palu Valley, namely Balaroa, Petobo, Jono Oge, Lolu, and Sibalaya (Mason et al 2019; Hazarika et al 2021a, b). In all these locations, the landslides occurred rapidly, with ground movement in massive blocks along with debris flow; these can be classified as flowslides according to the Varnes classification (Hungr et al 2014). The earthquake triggered the extensive flowslides about 70 km from the epicenter, in several locations in the Palu Valley Areas such as Balaroa, Petobo, Jono Oge, and Sibalaya were the worst affected by the extensive flowslides (Fig. 2). NDVI is a graphical index that is a measure of green vegetation, with values defined from − 1 to 1 in the index, with values (a)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
