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Title: Structural controls on rupture extent of recent Sumatran Fault Zone earthquakes, Indonesia
Authors: Salman, Rino
Lindsey, Eric O.
Feng, Lujia
Bradley, Kyle
Wei, Shengji
Wang, Teng
Daryono, Mudrik R.
Hill, Emma M.
Keywords: Science::Geology::Volcanoes and earthquakes
Issue Date: 2020
Source: Salman, R., Lindsey, E. O., Feng, L., Bradley, K., Wei, S., Wang, T., ... Hill, E. M. (2020). Structural controls on rupture extent of recent Sumatran Fault Zone earthquakes, Indonesia. Journal of Geophysical Research: Solid Earth, 125(2). doi:10.1029/2019JB018101
Journal: Journal of Geophysical Research: Solid Earth
Abstract: We present geodetically derived coseismic slip models for four Mw ~6 strike-slip earthquakes that struck the mainland island of Sumatra, Indonesia, between 2007 and 2016. Three of these earthquakes ruptured segments of the Sumatran Fault Zone: the 2007 Mw 6.3 and 6.4 Lake Singkarak doublet, and the 2009 Mw 6.6 Dikit event. The fourth earthquake, the 2016 Mw 6.6 Pidie Jaya event, ruptured an unmapped active fault in a region of historically low seismicity near the northern coast of Aceh. Our results suggest that (1) the estimated rupture extents of the 2007 Lake Singkarak doublet and 2009 Dikit event were limited by geological structures such as step overs that define segment boundaries, (2) the 2016 Pidie Jaya event did not produce surface rupture despite the fact that it produced large shallow slip of more than 2.5 m, and (3) the remaining seismic gaps on the Sumatran Fault Zone are primarily located between the equator and northern Sumatra. We strongly recommend that seismic hazard assessment for densely populated areas in Sumatra include threats not only from the Sumatran Fault Zone but also from additional potentially active faults outside of the main Sumatran Fault Zone.
ISSN: 2169-9356
DOI: 10.1029/2019JB018101
DOI (Related Dataset):
Rights: © 2020 The Authors. This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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