Dynamic inversion of the 2015 Jujuy earthquake and similarity with other intraslab events

Abstract

We study the seismic source of the 2015 (M-w 6.7) Jujuy, Argentina intermediate depth earthquake. We first constrain the fault plane by using a teleseismic inversion and by determining the aftershock distribution. Then, we perform kinematic and dynamic inversions to retrieve the parameters that control the rupture process, using data at regional distances, and modelling the source as an elliptical patch. Best models suggest a subshear rupture propagation with a duration of similar to 5 s. Results from the dynamic modelling suggest a stress drop of 11.87 MPa and a fracture energy rate of 2.95 MJ m(-2), which are slightly less but of the same order as those of other events of similar size. Finally, we perform a Monte-Carlo inversion to explore the behaviour of the frictional parameters in the solution space, and then we compare our results with other intraslab events. We find that the. parameter (ratio between strain energy and fracture energy) and the relation between seismic moment and stress drop are similar for all the considered events.