The Sumbing cluster is named for Mount Sumbing, a strato-volcano in
central Java, Indonesia. The cluster includes shallow earthquakes on
land and also earthquakes in the subduction zone, up to ~100 km offshore
and to a depth of ~160 km. It includes three M6 earthquakes: on June 9,
1992 (6.1 Mw), May 26, 2006 (6.3 Mw) and January 25, 2014 (6.3 Mw). Most
events are recorded to teleseismic distances but a few smaller,
locally-recorded earthquakes are retained for improved statistics for
direct calibration. All events have depth constraint from near-source
and local distance readings, as well as teleseismic depth phases in many
instances. The distribution of stations for the events on land is very
good and the location calibration is robust, but like most subduction
zone clusters, offshore events tend to be less stable.
