Shrivastava M. N., Gonzalez G., Moreno M., Chlieh Mohamed, Salazar P., Reddy C. D., Baez J. C., Yanez G., Gonzalez J., de la Llera J. C. (2016). Coseismic slip and afterslip of the 2015 M-w 8.3 Illapel (Chile) earthquake determined from continuous GPS data. Geophysical Research Letters, 43 (20), p. 10710-10719. ISSN 0094-8276.
Titre du document
Coseismic slip and afterslip of the 2015 M-w 8.3 Illapel (Chile) earthquake determined from continuous GPS data
Shrivastava M. N., Gonzalez G., Moreno M., Chlieh Mohamed, Salazar P., Reddy C. D., Baez J. C., Yanez G., Gonzalez J., de la Llera J. C.
Source
Geophysical Research Letters, 2016,
43 (20), p. 10710-10719 ISSN 0094-8276
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.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020]
;
Géophysique interne [066]
