Repeating Earthquakes at the Edge of the Afterslip of the 2016 Ecuadorian M W 7.8 Pedernales Earthquake - Observatoire de la Cote d'Azur Accéder directement au contenu
Article Dans Une Revue Journal of Geophysical Research : Solid Earth Année : 2021

Repeating Earthquakes at the Edge of the Afterslip of the 2016 Ecuadorian M W 7.8 Pedernales Earthquake

Caroline Chalumeau
Hans Agurto‐detzel
  • Fonction : Auteur
Louis de Barros
Philippe Charvis
Audrey Galve
Andreas Rietbrock
  • Fonction : Auteur
Stephen Hernandez
  • Fonction : Auteur
Yvonne Font
Mariah Hoskins
  • Fonction : Auteur
Sergio León‐ríos
  • Fonction : Auteur
Anne Meltzer
  • Fonction : Auteur
Colton Lynner
  • Fonction : Auteur
Frederique Rolandone
  • Fonction : Auteur
Jean‐mathieu Nocquet
Marc Régnier
  • Fonction : Auteur
Mario Ruiz
  • Fonction : Auteur
Lillian Soto‐cordero
  • Fonction : Auteur
Sandro Vaca
  • Fonction : Auteur
Mónica Segovia
  • Fonction : Auteur

Résumé

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. Combined with the fact that repeaters appear more spatially correlated with the afterslip gradient than with the afterslip maxima, we suggest that stress accumulation at the edge of the afterslip may guide repeater behavior.
Fichier principal
Vignette du fichier
2021JB021746.pdf (3.13 Mo) Télécharger le fichier
Origine : Publication financée par une institution

Dates et versions

hal-03221093 , version 1 (11-06-2021)

Licence

Paternité

Identifiants

Citer

Caroline Chalumeau, Hans Agurto‐detzel, Louis de Barros, Philippe Charvis, Audrey Galve, et al.. Repeating Earthquakes at the Edge of the Afterslip of the 2016 Ecuadorian M W 7.8 Pedernales Earthquake. Journal of Geophysical Research : Solid Earth, 2021, 126 (5), pp.e2021JB021746. ⟨10.1029/2021JB021746⟩. ⟨hal-03221093⟩
87 Consultations
46 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More