Muhsiung Chang, - and Ren-Chung Huang, - and Togani C. Upomo, - and Galih A. Prayitno, - and Rini Kusumawardani, FT Teknik Sipil and Muhammad H. Fansuri, - (2021) Site Reconnaissance of Liquefaction-Induced Petobo Landslide during 2018.9.28 Palu-Donggala Indonesia Earthquake (I). 地工技術 (16).

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Abstract

The incident of Mw7.5 Palu-Donggala earthquake, occurred on September 28 of 2018 in Sulawesi island of Indonesia, has resulted in significant tsunami along the bay of Palu City, and several large-scale liquefaction-induced landslides inlands. This paper discusses the most severe landslide during this earthquake, located in Petobo area to the south-eastern suburb of the city. The sliding area in Petobo was the second largest (1.64 Km2), next to Jono Oge, among all of the landslides in this earthquake. However, the sliding distance in Petobo was very long (>800m) and the consequence of damage was most serious (estimated >3300 houses collapsed and ~2000 fatalities). Some common aspects are noticed in these liquefaction-induced slides, including low-reliefs of the ground (<3ºor <5%) prior to failure and close proximities to an irrigation cannel along crest boundaries of slide, etc. So far, speculations on possible causes of the long-distance slides still remain and no conclusion is available. In a way to clarify the causes and mechanism of slide, the authors conducted an onsite reconnaissance as well as subsurface explorations and testing at the Petobo site. The following paper addresses the first part of our preliminary results on the surface observations and variations before and after the sliding. Results of witness interviews and characterization of morphologic zones of the site will be discussed subsequently in the associated (Part-II) paper

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