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      Do slow slip events trigger large and great megathrust earthquakes?

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          Abstract

          A slow slip event in Costa Rica migrated toward the hypocenter of a large megathrust earthquake, possibly triggering the event.

          Abstract

          Slow slip events have been suggested to trigger subduction earthquakes. However, examples to date have been poorly recorded, occurring offshore, where data are sparse. Better understanding of slow slip events and their influence on subsequent earthquakes is critical for hazard forecasts. We analyze a well-recorded event beginning 6 months before the 2012 M w (moment magnitude) 7.6 earthquake in Costa Rica. The event migrates to the eventual megathrust rupture. Peak slip rate reached a maximum of 5 mm/day, 43 days before the earthquake, remaining high until the earthquake. However, changes in Mohr-Coulomb failure stress at the hypocenter were small (0.1 bar). Our data contradict models of earthquake nucleation that involve power law acceleration of slip and foreshocks. Slow slip events may prove useful for short-term earthquake forecasts.

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                Author and article information

                Journal
                Sci Adv
                Sci Adv
                SciAdv
                advances
                Science Advances
                American Association for the Advancement of Science
                2375-2548
                October 2018
                31 October 2018
                : 4
                : 10
                Affiliations
                [1 ]School of Geosciences, University of South Florida, Tampa, FL, USA.
                [2 ]Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
                [3 ]Universidad Nacional, OVSICORI, Heredia, Costa Rica.
                [4 ]Earth and Planetary Sciences, University of California Santa Cruz, Santa Cruz, CA, USA.
                Author notes
                [* ]Corresponding author. Email: nvoss@ 123456mail.usf.edu
                Article
                aat8472
                10.1126/sciadv.aat8472
                6209384
                Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

                This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

                Funding
                Funded by: doi http://dx.doi.org/10.13039/100000001, National Science Foundation;
                Award ID: 1345100
                Categories
                Research Article
                Research Articles
                SciAdv r-articles
                Geology
                Geology
                Custom metadata
                Eunice Ann Alesin

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