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Does a Damaged-Fault Zone Mitigate the Near-Field Impact of Supershear Earthquakes?—Application to the 2018 M_w 7.5 Palu, Indonesia, Earthquake

Oral, Elif and Weng, Huihui and Ampuero, Jean-Paul (2020) Does a Damaged-Fault Zone Mitigate the Near-Field Impact of Supershear Earthquakes?—Application to the 2018 M_w 7.5 Palu, Indonesia, Earthquake. Geophysical Research Letters, 47 (1). Art. No. e2019GL085649. ISSN 0094-8276. https://resolver.caltech.edu/CaltechAUTHORS:20191223-135553258

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Abstract

The impact of earthquakes can be severely aggravated by cascading secondary hazards. The 2018 M_w 7.5 Palu, Indonesia, earthquake led to devastating tsunamis and landslides, while triggered submarine landslides possibly contributed substantially to generate the tsunami. The rupture was supershear over most of its length, but its speed was unexpectedly slow for a supershear event, between the wave velocity V_s and Eshelby's speed √2V_s, an unstable speed range in conventional theory. Here, we investigate whether dynamic rupture models including a low‐velocity fault zone can reproduce such a steady supershear rupture with a relatively low speed. We then examine numerically how this peculiar feature of the Palu earthquake could have affected the near‐field ground motion and thus the secondary hazards. Our findings suggest that the presence of a low‐velocity fault zone can explain the unexpected rupture speed and may have mitigated the near‐field ground motion and the induced landslides in Palu.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1029/2019GL085649DOIArticle
https://doi.org/10.31223/osf.io/5nugqDOIDiscussion Paper
https://github.com/jpampuero/sem2dpackRelated Item2D Wave Propagation Modeling Tools
https://github.com/geodynamics/specfem3dRelated Item3D Wave Propagation Modeling Tools
ORCID:
AuthorORCID
Oral, Elif0000-0003-1081-5580
Weng, Huihui0000-0002-2936-2342
Ampuero, Jean-Paul0000-0002-4827-7987
Alternate Title:Does a damaged fault zone mitigate the near-field landslide risk during supershear earthquakes?—Application to the 2018 magnitude 7.5 Palu earthquake
Additional Information:© 2020 American Geophysical Union. Received 2 OCT 2019; Accepted 23 DEC 2019; Accepted article online 3 JAN 2020. This work was supported by the French National Research Agency (ANR) through project FAULTS_R_GEMS (Grant ANR‐17‐CE31‐0008) and Investments‐in‐the‐Future project UCAJEDI (Grant ANR‐15‐IDEX‐01). We acknowledge Luis A. Dalguer for helpful comments that improved the content of this manuscript. All data needed to reproduce this work are available online: 2‐D and 3‐D wave propagation modeling tools can be found at the websites (https://github.com/jpampuero/sem2dpack and https://github.com/geodynamics/specfem3d).
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
Agence Nationale pour la Recherche (ANR)ANR-17-CE31-0008
Agence Nationale pour la Recherche (ANR)ANR-15-IDEX-01
Subject Keywords:supershear rupture; seismic wave propagation; dynamic rupture modeling; earthquake‐induced landslides; damaged‐fault zones
Issue or Number:1
Record Number:CaltechAUTHORS:20191223-135553258
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20191223-135553258
Official Citation:Oral, E., Weng, H., & Ampuero, J. P. (2020). Does a damaged‐fault zone mitigate the near‐field impact of supershear earthquakes?—Application to the 2018 Mw 7.5 Palu, Indonesia, earthquake. Geophysical Research Letters, 47, e2019GL085649. https://doi.org/10.1029/2019GL085649
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100416
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:23 Dec 2019 22:27
Last Modified:03 Aug 2020 19:02

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