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Repeating Earthquakes at the Edge of the Afterslip of the 2016 Ecuadorian M$_{W}$ 7.8 Pedernales Earthquake

Chalumeau, C.; Agurto-Detzel, H.; De Barros, L.; Charvis, P.; Galve, A.; Rietbrock, A. 1; Alvarado, A.; Hernandez, S.; Beck, S.; Font, Y.; Hoskins, M. C.; León-Ríos, S. 1; Meltzer, A.; Lynner, C.; Rolandone, F.; Nocquet, J.-M.; Régnier, M.; Ruiz, M.; Soto-Cordero, L.; ... mehr

Abstract:
Repeating earthquakes repeatedly rupture the same seismic asperity and are strongly linked to aseismic slip. Here, we study the repeating aftershocks of the April 16, 2016 MW 7.8 Pedernales earthquake in Ecuador, which generated a large amount of afterslip. Using temporary and permanent stations, we correlate waveforms from a one-year catalog of aftershocks. We sort events with a minimum correlation coefficient of 0.95 into preliminary families, which are then expanded using template-matching to include events from April 2015 to June 2017. In total, 376 repeaters are classified into 62 families of 4–15 events. They are relocated, first using manual picks, and then using a double difference method. We find repeating earthquakes during the whole period, occurring primarily within large aftershock clusters on the edges of the areas of largest afterslip release. Their recurrence times, shortened by the mainshock, subsequently increase following an Omori-type law, providing a timeframe for the afterslip's deceleration. Although they are linked temporally to the afterslip, repeater-derived estimates of slip differ significantly from GPS-based models. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000133849
Veröffentlicht am 01.07.2022
Originalveröffentlichung
DOI: 10.1029/2021JB021746
Scopus
Zitationen: 2
Web of Science
Zitationen: 3
Dimensions
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Geophysikalisches Institut (GPI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2169-9313, 0148-0227, 2156-2202, 2169-9356
KITopen-ID: 1000133849
Erschienen in Journal of Geophysical Research: Solid Earth
Verlag John Wiley and Sons
Band 126
Heft 5
Seiten e2021JB021746
Nachgewiesen in Dimensions
Scopus
Web of Science
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