The Bandung cluster is named for the city of Bandung on the island of
Java, Indonesia. Earthquakes prior to about 2010 could not be included
in the relocation because of a lack of local network observations. Some
constraint on location and depth for these earlier events could be
obtained from regional and teleseismic observations but not enough for
stable calibrated relocation. The cluster consists mainly of shallow
earthquakes (to ~20 km) on the island, but the cluster includes about a
dozen events offshore to the south, which are generally associated with
the subduction zone at depths of 30-50 km. Most off-shore events proved
to be unstable in the relocation analysis. Location calibration is
completely controlled by the on-shore events, many of which are small
and recorded only locally. The largest on-shore event, on November 21,
2022, has magnitude 5.6 mb. All events have depth control from
near-source and local distance arrivals, and some also have consistent
depth estimates from teleseismic depth phases.
