Technical Report
 

Geotechnical Reconnaissance: The 28 September 2018 M7.5 Palu-Donggala, Indonesia Earthquake

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  • The Mw7.5 Palu-Donggala earthquake occurred on 28 September 2018 at 6:02 PM local time, and was caused by strike-slip faulting along the north-south trending Palu-Koro fault that extends through Palu City and the Central Sulawesi region of Indonesia. The United States Geological Survey (USGS) reports the epicenter was approximately 72 km north of Palu City at a depth of 10 km, and geodetic evidence indicates rupture of the fault over a length of 150 km. The earthquake triggered a series of massive landslides, resulted in the collapse of both unreinforced and reinforced structures, and generated tsunami waves that impacted coastal areas in Palu Bay, devastating Central Sulawesi. This report contains information about the geotechnical reconnaissance performed by the Geotechnical Extreme Events Reconnaissance (GEER) during November 2018 following the damaging earthquake and tsunami. Particular attention is devoted to a series of large liquefaction-induced flowslides that occurred after earthquake shaking ceased.
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  • Mason, H. B., Gallant, A. P, Hutabarat, D., Montgomery, J., Reed, A. N., Wartman, J. et al. (2019). Geotechnical Reconnaissance: The 28 September 2018 M7.5 Palu-Donggala, Indonesia Earthquake. Report No. GEER-061. Geotechnical Extreme Events Reconnaissance Association, Atlanta, Georgia, USA. 10.18118/G63376
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  • Geotechnical Extreme Events Reconnaissance website
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  • The work of the GEER Association is based upon work supported in part by the National Science Foundation through the Geotechnical Engineering Program under Grant No. CMMI-1266418. The GEER Association is made possible by the vision and support of the NSF Geotechnical Engineering Program Directors: Dr. Richard Fragaszy and the late Dr. Cliff Astill. Reconnaissance mission field support was provided by the Natural Hazards Reconnaissance Facility (known as the "RAPID") under NSF grant 1611820. GEER members also donate their time, talent, and resources to collect time-sensitive field observations of the effects of extreme events. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the NSF.
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