Title: Characteristic repeating earthquake sequences along the Pacific Trench of Mexico

Lecturer: Luis A. Dominguez (ENES Morelia, UNAM)

Date: July 9, 16:00-

Place: Kyoto University Uji Campus Main Building, E-232D

*Abstract:*Evaluation of the spatial and temporal variation using repeating earthquake activities provides a unique tool to estimate the aseismic fault slip and seismic coupling at frequently inaccessible seismogenic depths. Repeating earthquakes are sequences of events that are thought to rupture the same asperity and thus provide nearly identical waveforms. The number of times the earthquake repeated puts constraints on the relative aseismic slip rate surrounding the repeating event asperities. We systematically examine 14 years of seismic data (from 2001 through 2014) to identify repeating earthquakes along the subduction of the Cocos plate. Our goal is to evaluate the slip budget at the interface and the earthquake cycle of repeating events. We find ~50 clusters of repeating earthquake sequences (magnitude ranges from 3.5 to 4.2) located near the edges of the rupture zones for the past M~7 earthquakes (1995, 2012, 2014) in which Mw~7.0 slow slip events occur. We discuss the possible implications and needs for future deployments along the Middle America trench both inland and offshore. Understanding the different components of the aseismic slip budget is a key factor to pinpoint areas where large megathrust earthquakes nucleate and consequently better assess the seismic hazard.