The Sumba cluster is named for the island of Sumba in the Lesser Sunda
Islands of eastern Indonesia. The cluster is restricted to events with
constrained focal depths of 40 km or less since 2008. Earlier events
lack station coverage to adequately link them to the more recent
earthquakes. The largest earthquake has magnitude 5.8 Mw, on February
21, 2022. With one exception (depth constrained by teleseismic depth
phases) all events have depth constraint from near-source or
local-distance readings. Many small events that were recorded only to
near-regional distances are retained to improve the statistical power of
the location calibration.
