Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Shortcut Faults and Lateral Spreading Activated in a Pull-Apart Basin by the 2018 Palu Earthquake, Central Sulawesi, Indonesia

Version 1 : Received: 16 June 2021 / Approved: 18 June 2021 / Online: 18 June 2021 (15:08:26 CEST)

A peer-reviewed article of this Preprint also exists.

Komura, K.; Sugimoto, J. Shortcut Faults and Lateral Spreading Activated in a Pull-Apart Basin by the 2018 Palu Earthquake, Central Sulawesi, Indonesia. Remote Sens. 2021, 13, 2939. Komura, K.; Sugimoto, J. Shortcut Faults and Lateral Spreading Activated in a Pull-Apart Basin by the 2018 Palu Earthquake, Central Sulawesi, Indonesia. Remote Sens. 2021, 13, 2939.

Journal reference: Remote Sens. 2021, 13, 2939
DOI: 10.3390/rs13152939

Abstract

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.

Subject Areas

2018 Palu earthquake, pull-apart basin, basin-shortcut fault, lateral spreading, optical correlation

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