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Shortcut Faults and Lateral Spreading Activated in a Pull-Apart Basin by the 2018 Palu Earthquake, Central Sulawesi, Indonesia
Remote Sensing ( IF 5 ) Pub Date : 2021-07-27 , DOI: 10.3390/rs13152939
Keitaro Komura , Jun Sugimoto

Our understanding of pull-apart basins and their fault systems has been enhanced by analog experiments and simulations. However, there has been scarce interest to compare the faults that bound 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 on digital elevation models and 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.

中文翻译:

印度尼西亚中苏拉威西岛 2018 年帕卢地震在拉开盆地中激活的捷径断层和横向扩展

模拟实验和模拟增强了我们对拉断盆地及其断层系统的理解。然而,人们几乎没有兴趣比较地震期间将拉开盆地与地表破裂相结合的断层。在这项研究中,我们使用数字高程模型的地貌观测以及与前后的光学相关性,研究了 2018 年地震 (Mw 7.5) 对印度尼西亚苏拉威西岛帕卢-科罗断层系统中拉开盆地的影响。 -地震卫星图像。由地貌确定的活动断层痕迹与 2018 年地震的地表破裂位置的比较表明,盆地的一些边界断层是不活动的,活动断层已转移到盆地捷径断层和中继斜坡。我们还报告了横向传播的证据,其中冲积扇材料围绕冲积扇末端移动。这些现象可能为预测拉开盆地中未来地表破裂的位置提供见解。
更新日期:2021-07-27
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