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Structural Control on Megathrust Rupture and Slip Behavior: Insights From the 2016 Mw 7.8 Pedernales Ecuador Earthquake

Soto‐Cordero, Lillian; Meltzer, Anne; Bergman, Eric; Hoskins, Mariah; Stachnik, Joshua C.; Agurto‐Detzel, Hans; Alvarado, Alexandra; Beck, Susan; Charvis, Philippe; Font, Yvonne; Hayes, Gavin P.; Hernandez, Stephen; Lynner, Colton; Leon‐Rios, Sergio; Nocquet, Jean‐Mathieu; Regnier, Marc; Rietbrock, Andreas; Rolandone, Frederique; Ruiz, Mario

Abstract:
The heterogeneous seafloor topography of the Nazca Plate as it enters the Ecuador subduction zone provides an opportunity to document the influence of seafloor roughness on slip behavior and megathrust rupture. The 2016 M$_{w}$ 7.8 Pedernales Ecuador earthquake was followed by a rich and active postseismic sequence. An internationally coordinated rapid response effort installed a temporary seismic network to densify coastal stations of the permanent Ecuadorian national seismic network. A combination of 82 onshore short and intermediate period and broadband seismic stations and six ocean bottom seismometers recorded the postseismic Pedernales sequence for over a year after the mainshock. A robust earthquake catalog combined with calibrated relocations for a subset of magnitude ≥4 earthquakes shows pronounced spatial and temporal clustering. A range of slip behavior accommodates postseismic deformation including earthquakes, slow slip events, and earthquake swarms. Models of plate coupling and the consistency of earthquake clustering and slip behavior through multiple seismic cycles reveal a segmented subduction zone primarily controlled by subducted seafloor topography, accreted terranes, and inherited structure. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000120166
Veröffentlicht am 13.06.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Geophysikalisches Institut (GPI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2169-9313, 2169-9356
KITopen-ID: 1000120166
Erschienen in Journal of geophysical research / Solid earth
Band 125
Heft 2
Seiten e2019JB018001
Vorab online veröffentlicht am 17.02.2020
Nachgewiesen in Web of Science
Scopus
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