artículo
Coseismic slip and afterslip of the 2015 Mw 8.3 Illapel (Chile) earthquake determined from continuous GPS data
Fecha
2016Registro en:
10.1002/2016GL070684
1944-8007
0094-8276
WOS:000388293800049
Autor
Shrivastava, Mahesh N.
González, Gabriel
Moreno, Marcos
Chlieh, Mohamed
Salazar, Pablo
Reddy, C.D.
Báez, Juan Carlos
Yanez Carrizo Gonzalo Alejandro
González, Juan
De La Llera Martin Juan Carlos
Institución
Resumen
We analyzed the coseismic and early postseismic deformation of the 2015, M-w 8.3 Illapel earthquake by inverting 13 continuous GPS time series. The seismic rupture concentrated in a shallow (<20km depth) and 100km long asperity, which slipped up to 8m, releasing a seismic moment of 3.6x10(21)Nm (M-w=8.3). After 43days, postseismic afterslip encompassed the coseismic rupture. Afterslip concentrated in two main patches of 0.50m between 20 and 40km depth along the northern and southern ends of the rupture, partially overlapping the coseismic slip. Afterslip and aftershocks confined to region of positive Coulomb stress change, promoted by the coseismic slip. The early postseismic afterslip was accommodated similar to 53% aseismically and similar to 47% seismically by aftershocks. The Illapel earthquake rupture is confined by two low interseismic coupling zones, which coincide with two major features of the subducting Nazca Plate, the Challenger Fault Zone and Juan Fernandez Ridge.