Shortcut Faults and Lateral Spreading Activated in a Pull-Apart Basin by the 2018 Palu Earthquake, Central Sulawesi, Indonesia
| Autor: | Jun Sugimoto, Keitaro Komura |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
geography
geography.geographical_feature_category 010504 meteorology & atmospheric sciences optical correlation Science Alluvial fan Pull apart basin Active fault Structural basin Fault (geology) 2018 Palu earthquake basin-shortcut fault 010502 geochemistry & geophysics 01 natural sciences atmospheric_science pull-apart basin General Earth and Planetary Sciences lateral spreading Optical correlation Digital elevation model Seismology Geology 0105 earth and related environmental sciences |
| Zdroj: | Remote Sensing, Vol 13, Iss 2939, p 2939 (2021) Remote Sensing Volume 13 Issue 15 |
| ISSN: | 2072-4292 |
| Popis: | Our understanding of pull-apart basins and their fault systems has been enhanced by analog experiments and simulations. However, there has been no opportunity to compare the faults that constitute pull-apart basins with surface ruptures during earthquakes. In this study, we investigated the effects of a 2018 earthquake (Mw 7.5) on a pull-apart basin in the Palu-Koro fault system, Sulawesi Island, Indonesia, using geomorphic observations in digital elevation models, optical correlation with pre- and post-earthquake satellite images. A comparison of active fault traces determined by geomorphology with the locations of surface ruptures from the 2018 earthquake shows that some of the boundary faults of the basin are inactive and that active faulting has shifted to basin-shortcut faults and relay ramps. We also report evidence of lateral spreading, in which alluvial fan materials moved around the end of the alluvial fan. These phenomena may provide insights for anticipating the location of future surface ruptures in pull-apart basins. |
| Databáze: | OpenAIRE |
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