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Unraveling scaling properties of slow-slip events

Dal Zilio, Luca and Lapusta, Nadia and Avouac, Jean‐Philippe (2020) Unraveling scaling properties of slow-slip events. Geophysical Research Letters, 47 (10). Art. No. e2020GL087477. ISSN 0094-8276.

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A major debate in geophysics is whether earthquakes and slow‐slip events (SSEs) arise from similar failure mechanisms. Recent observations from different subduction zones suggest that SSEs follow the same moment‐duration scaling as earthquakes, unlike qualitatively different scaling proposed by earlier studies. Here, we examine the scaling properties using dynamic simulations of frictional sliding. The resulting sequences of SSEs match observations from the Cascadia subduction zone, including the earthquake‐like cubic moment‐duration scaling. In contrast to conventional and widely used assumptions of magnitude‐invariant rupture velocities and stress drops, both simulated and natural SSEs have rupture velocities and stress drops that increase with event magnitudes. These findings support the same frictional origin for both earthquakes and SSEs while suggesting a new explanation for the observed SSEs scaling.

Item Type:Article
Related URLs:
URLURL TypeDescription
Dal Zilio, Luca0000-0002-5642-0894
Lapusta, Nadia0000-0001-6558-0323
Avouac, Jean‐Philippe0000-0002-3060-8442
Additional Information:© 2020 American Geophysical Union. Received 11 FEB 2020; Accepted 9 MAY 2020; Accepted article online 12 MAY 2020. L. D. Z. was supported by the Swiss National Science Foundation (SNSF) P2EZP2_184307 Early Postdoc.Mobility fellowship and the Cecil and Sally Drinkward fellowship at Caltech. We thank V. Lambert, H. Kanamori, A. Gualandi, S. Michel, and Z. Ross for constructive comments and discussions. We thank the Editor and two anonymous reviewers for providing insightful comments that helped to improve the quality of this paper. Data Availability Statement: Data related to this paper can be downloaded from the following link ( Author Contributions: Conceptualization: Luca Dal Zilio, Nadia Lapusta, Jean-Philippe Avouac Methodology: Luca Dal Zilio, Nadia Lapusta, Jean-Philippe Avouac Writing - Original Draft: Luca Dal Zilio, Nadia Lapusta, Jean-Philippe Avouac Formal Analysis: Luca Dal Zilio, Nadia Lapusta, Jean-Philippe Avouac.
Group:Center for Geomechanics and Mitigation of Geohazards (GMG), Division of Geological and Planetary Sciences, Seismological Laboratory
Funding AgencyGrant Number
Swiss National Science Foundation (SNSF)P2EZP2_184307
Cecil and Sally Drinkward FellowshipUNSPECIFIED
Subject Keywords:Slow‐slip events; Moment‐duration scaling; Cascadia; Modeling; Subduction zones; rupture velocity
Issue or Number:10
Record Number:CaltechAUTHORS:20200513-130033224
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Official Citation:Dal Zilio, L., Lapusta, N., & Avouac, J.‐P. (2020). Unraveling scaling properties of slow‐slip events. Geophysical Research Letters, 47, e2020GL087477.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103177
Deposited By: Tony Diaz
Deposited On:13 May 2020 20:17
Last Modified:15 Nov 2022 19:16

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