The Acapulco cluster is named for the city of Acapulco on the coast of
Guerrero State, Mexico. This series replaces the acapulco5 cluster
previously published in GCCEL. The cluster includes a 7.0 Mw earthquake
on September 8, 2021 and four earthquakes with magniude 6.0 or greater
(6.8 Mw on 4/25/1989, 6.0 Mw on 4/13/2007, 6.2 Mw on 8/21/2013 and 6.5
Mw on 1/2/2026). Earthquakes located more than ~15 km off-shore or
deeper than ~60 km were not included, to avoid location bias. The
distribution of seismograph stations for direct calibration is quite
good. All events have depth control, mainly from near-source and
local-distance readings.
