Coastal landslides in Palu Bay during 2018 Sulawesi earthquake and tsunami
| Autor: | Pablo Higuera, Semeidi Husrin, Philip L.-F. Liu, Joko Prihantono, H. Diastomo, Gegar Prasetya, H. Susmoro, Dino Gunawan Pryambodo |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
021110 strategic
defence & security studies geography geography.geographical_feature_category Tsunami wave 0211 other engineering and technologies Landslide 02 engineering and technology Fault (geology) Geotechnical Engineering and Engineering Geology Tectonics Natural hazard Kondratiev wave Bathymetry Bay Geology Seismology 021101 geological & geomatics engineering |
| Zdroj: | Landslides. 17:2085-2098 |
| ISSN: | 1612-5118 1612-510X |
| Popis: | In this paper, we investigate the sources for Palu Bay tsunamis, which occurred in September 2018 after a Mw 7.5 earthquake struck on a strike-slip fault. Previous land-based field studies have identified numerous coastal landslides as possible sources for tsunami generation. Here, we present new post-earthquake bathymetry survey data in the bay. We compare the new very detailed nearshore bathymetry with the pre-earthquake data so as to quantify the magnitudes and configurations of coastal landslides and the characteristics of landslide-generated waves. We perform numerical simulations of tsunami propagation, isolating the coastal landslides as the only sources. The results show that, although the landslide-generated waves characteristically have shorter periods than the observed tsunami waves, the combination of the waves is able to produce long waves comparable with those observed, due to the ringing effects of the trapped waves inside the bay. Therefore, we conclude that landslide-generated waves played a significant role in the tsunamis in Palu Bay. Nevertheless, it is likely that the tsunamis were caused by a combination of tectonic and landslide sources. |
| Databáze: | OpenAIRE |
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