Abstract
Abstract. An earthquake with a magnitude of Mw=7.5 that occurred in Sulawesi, Indonesia, on 28 September 2018 triggered liquefaction and tsunamis that caused severe damage and many casualties. This paper reports the results of a post-tsunami field survey conducted by a team with members from Indonesia and Taiwan that began 13 d after the earthquake. The main purpose of this survey was to measure the run-up of tsunami waves and inundation and observe the damage caused by the tsunami. Measurements were made in 18 selected sites, most in Palu Bay. The survey results show that the run-up height and inundation distance reached 10.7 m in Tondo and 488 m in Layana. Inundation depths of 2 to 4 m were common at most sites and the highest was 8.4 m in Taipa. The arrival times of the tsunami waves were quite short and different for each site, typically about 3–8 min from the time of the main earthquake event. This study also describes the damage to buildings and infrastructure and coastal landslides.
Highlights
On Friday, 28 September 2018, at 18:02:44 central Indonesia time (UTC + 8), Palu Bay was hit by a strong earthquake with a magnitude of Mw = 7.5
Low-amplitude tsunami waves were detected in Mamuju, a city overlooking the Makassar Strait and outside Palu Bay
The field survey reported in the present study focuses on hydrodynamic data that include measurements of run-up height and inundation distance
Summary
Sigi Regency did not suffer damage from the tsunami, but large-scale liquefaction led to a significant number of deaths and disappearances in this area This disaster in Central Sulawesi surprised the scientific community. Yalciner et al (2001) conducted a field survey and modeled the 1999 Izmit tsunami, which is similar in terms of geographical features, earthquake magnitude, and tsunami mechanism compared with the recent Sulawesi tsunami These data can be used to help formulate disaster risk management strategies and rebuild the areas affected by the 2018 Sulawesi tsunami. Arikawa et al (2018), Sassa and Takagawa (2018), and Takagi et al (2019) each conducted a survey related to coastal subsidence, coastal liquefaction, or submarine landslides detected in Palu Bay. Putra et al (2019) focused on tsunami deposits. We provide data of run-up height, inundation distance, flow depth/inundation depth, and damage at different points and coordinates
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