07 Apr 2020
07 Apr 2020
Discrete element modeling of a subduction zone with a seafloor irregularity and its impact on the seismic cycle
- 1Institut de Physique du Globe de Paris, CNRS, Paris, France
- 2Université de Paris, Paris, France
- 3Department of Earth Science, National Central University, Taiwan
- 4Earth Observatory of Singapore, Nanyang Technological University, Singapore
- 5Université de Lorraine, CNRS, Laboratoire GeoRessources, Nancy, France
- 6Université de Liege, Department de Geography, Liege, Belgium
- 7Université Grenoble Alpes, Institut des Sciences de la Terre, Grenoble, France
- 8Institute of Crustal Dynamics, China Earthquake Administration, Beijing, China
- 1Institut de Physique du Globe de Paris, CNRS, Paris, France
- 2Université de Paris, Paris, France
- 3Department of Earth Science, National Central University, Taiwan
- 4Earth Observatory of Singapore, Nanyang Technological University, Singapore
- 5Université de Lorraine, CNRS, Laboratoire GeoRessources, Nancy, France
- 6Université de Liege, Department de Geography, Liege, Belgium
- 7Université Grenoble Alpes, Institut des Sciences de la Terre, Grenoble, France
- 8Institute of Crustal Dynamics, China Earthquake Administration, Beijing, China
Abstract. Seafloor irregularities influence rupture behavior along the subducting slab and in the overriding plate, thus affecting earthquake cycles. Whether seafloor irregularities increase the likelihood of large earthquakes in a subduction zone remains contested, partially due to focus put either on fault development or on rupture pattern. Here, we simulate a subducting slab with a seafloor irregularity and the resulting deformation pattern of the overriding plate using the discrete element method. Our simulations illustrate the rupture along three major fault systems: megathrust, splay and backthrust faults. Our results show different rupture dimensions of earthquake events varying from tens to ca. 140 km. Our results suggest that the recurrence interval of megathrust events with rupture length of ca. 100 km is ca. 140 years, which is overall comparable to the paleoseismic records at the Mentawai area of the Sumatran zone. We further propose the coseismic slip amounts decrease and interseismic slip amounts increase from the surface downwards gradually. We conclude that the presence of seafloor irregularities significantly affects rupture events along the slab as well as fault patterns in the overriding plate.
Liqing Jiao et al.


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RC1: 'Review of Manuscript se-2020-41', Anonymous Referee #1, 08 May 2020
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AC1: 'Reply to Referee #1', Chung-Han Chan, 11 Aug 2020
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AC1: 'Reply to Referee #1', Chung-Han Chan, 11 Aug 2020
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RC2: 'Comments', Anonymous Referee #2, 03 Jun 2020
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AC2: 'Reply to Referee #2', Chung-Han Chan, 11 Aug 2020
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AC2: 'Reply to Referee #2', Chung-Han Chan, 11 Aug 2020
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RC3: 'Review Jiao et al.', Anonymous Referee #3, 12 Jun 2020
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AC3: 'Reply to Referee #3', Chung-Han Chan, 11 Aug 2020
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AC3: 'Reply to Referee #3', Chung-Han Chan, 11 Aug 2020


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RC1: 'Review of Manuscript se-2020-41', Anonymous Referee #1, 08 May 2020
-
AC1: 'Reply to Referee #1', Chung-Han Chan, 11 Aug 2020
-
AC1: 'Reply to Referee #1', Chung-Han Chan, 11 Aug 2020
-
RC2: 'Comments', Anonymous Referee #2, 03 Jun 2020
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AC2: 'Reply to Referee #2', Chung-Han Chan, 11 Aug 2020
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AC2: 'Reply to Referee #2', Chung-Han Chan, 11 Aug 2020
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RC3: 'Review Jiao et al.', Anonymous Referee #3, 12 Jun 2020
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AC3: 'Reply to Referee #3', Chung-Han Chan, 11 Aug 2020
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AC3: 'Reply to Referee #3', Chung-Han Chan, 11 Aug 2020
Liqing Jiao et al.
Liqing Jiao et al.
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