The Ambon cluster is named for the island of Ambon in the Maluku Islands
of Indonesia. The cluster consists of earthquakes with depths to a
little over 50 km. It contains three M6 earthquakes, a 6.0 Mw event on
December 30, 1996, a 6.5 event on March 19, 2001, and a 6.5 Mw event
(the so-called Ambon earthquake) on September 25, 2019. All earthquakes
are recorded to teleseismic distances. All events have depth conrol from
near-source and local-distance arrivals or teleseismic depth phases. The
number of local distance seismograph stations is small but they are well
distributed and provide a robust location calibration.
