Repeating Earthquakes at the Edge of the Afterslip of the 2016 Ecuadorian M _W 7.8 Pedernales Earthquake

Repeating earthquakes repeatedly rupture the same seismic asperity and are strongly linked to aseismic slip. Here, we study repeating aftershocks of April 16, 2016 MW 7.8 Pedernales earthquake in Ecuador, which generated a large amount afterslip. Using temporary permanent stations, correlate waveforms from one-year catalog aftershocks. We sort events with minimum correlation coefficient 0.95 into preliminary families, then expanded using template-matching include 2015 June 2017. In total, 376 repeaters classified 62 families 4–15 events. They relocated, first manual picks, double difference method. find during whole period, occurring primarily within aftershock clusters on edges areas largest afterslip release. Their recurrence times, shortened by mainshock, subsequently increase following an Omori-type law, providing timeframe for afterslip's deceleration. Although they temporally afterslip, repeater-derived estimates slip differ significantly GPS-based models. Combined fact that appear more spatially correlated gradient than maxima, suggest stress accumulation at edge may guide repeater behavior.