Recent Slow Slip Events in Costa Rica Detected by GPS
Date: 4/25/2019
Time: 11:15 AM
Room: Puget Sound
Slow Slip Events (SSE) are an important part of the seismic cycle in many subduction zones, releasing some portion of accumulated strain and perhaps triggering large earthquakes by loading nearby segments of the fault. We analyzed available GPS data to study SSEs in the Nicoya Peninsula of northwest of Costa Rica and the Osa Peninsula of southwestern Costa Rica. Available GPS data from 2016 to 2018 were processed, generating daily precise point positions. The resulting displacement time series are used to identify slow slip events and to evaluate their plate interface slip characteristics. The SSE in 2017 in Nicoya appears to have been accelerated by the magnitude 6.5 Esterillos earthquake which occurred in November. Slow slip occurs before and after the earthquake, but post-seismic displacements are almost 2 times the co-seismic displacements. We model the event as three stages (preseismic, coseismic, and accelerated SSE following the earthquake). We will discuss how stress along the subduction zone changed following the M 6.5 earthquake, perhaps leading to accelerated SSE behavior.
Presenting Author: Mahsa Afra
Authors
Mahsa Afra mahsaafra@mail.usf.edu University of South Florida, Tampa, Florida, United States Presenting Author
Corresponding Author
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Cyril Muller cyril.muller21@gmail.com OVSICORI, Universidad Nacional, Heredia, , Costa Rica |
Nicholas Voss nvoss28814@gmail.com University of South Florida, Tampa, Florida, United States |
Marino Protti marino.protti.quesada@una.cr OVSICORI, Universidad Nacional, Heredia, , Costa Rica |
Rocco Malservisi rocco@usf.edu University of South Florida, Tampa, Florida, United States |
Timothy H Dixon thd@usf.edu University of South Florida, Tampa, Florida, United States |
Mitchell Hastings mshastings18@gmail.com University of South Florida, Tampa, Florida, United States |
Recent Slow Slip Events in Costa Rica Detected by GPS
Category
Advances in Tectonic Geodesy