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Triggered crustal earthquake swarm across subduction segment boundary after the 2016 Pedernales, Ecuador megathrust earthquake

Hoskins, M. C.; Meltzer, A.; Font, Y.; Agurto-Detzel, H.; Vaca, S.; Rolandone, F.; Nocquet, J.-M.; Soto-Cordero, L.; Stachnik, J. C.; Beck, S.; Lynner, C.; Ruiz, M.; Alvarado, A.; Hernandez, S.; Charvis, P.; Regnier, M.; Leon-Rios, Sergio; Rietbrock, Andreas

Megathrust ruptures and the ensuing postseismic deformation cause stress changes that may induce seismicity on upper plate crustal faults far from the coseismic rupture area. In this study, we analyze seismic swarms that occurred in the north Ecuador area of Esmeraldas, beginning two months after the 2016 M$_{w}$ 7.8 Pedernales, Ecuador megathrust earthquake. The Esmeraldas region is 70 km from the Pedernales rupture area in a separate segment of the subduction zone. We characterize the Esmeraldas sequence, relocating the events using manual arrival time picks and a local a-priori 3D velocity model. The earthquake locations from the Esmeraldas sequence outline an upper plate fault or shear zone. The sequence contains one major swarm and several smaller swarms. Moment tensor solutions of several events include normal and strike-slip motion and non-double-couple components. During the main swarm, earthquake hypocenters increase in distance from the first event over time, at a rate of a few hundred meters per day, consistent with fluid diffusion. Events with similar waveforms occur within the sequence, and a transient is seen in time series of nearby GPS stations concurrent with the seismicity. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000125457
Veröffentlicht am 03.11.2020
DOI: 10.1016/j.epsl.2020.116620
Cover der Publikation
Zugehörige Institution(en) am KIT Geophysikalisches Institut (GPI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 0012-821X, 1385-013X
KITopen-ID: 1000125457
Erschienen in Earth and planetary science letters
Band 553
Seiten Art.-Nr.: 116620
Schlagwörter triggered seismicity; upper plate deformation; postseismic deformation; megathrust rupture; earthquake swarm; aftershocks
Nachgewiesen in Scopus
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