The Sosua cluster is named for the beach town of Sosua (Puerto Plata
Province) on the northern coast of the Dominican Republic. The cluster
includes a 6.4 Mw earthquake on September 22, 2003 and several other
events with magnitude greater than 5.0. Prior to 2017 there were few
seismograph stations in the area but events since then are well recorded
at close distances and with good azimuthal coverage. All events have
depth control. The oldest events have depth control from teleseismic
depth phases or waveform modeling; the more recent ones use near-source
and local-distance readings. Most of the earthquakes are recorded to
teleseismic distances but a few that were recorded only to near-regional
distances are retained to improve the location calibration.
