The Ushkan cluster is named for the Ushkan Islands in Lake Baykal,
Russia. Many of the included earthquakes are small and recorded only to
regional distances, but there is a modest amount of teleseismic data
from the larger events (up to 5.3 Mw). The distribution of seismograph
stations provides good azimuthal coverage at local distances for a
robust location calibration. All events have depth control, mainly from
near-source and local-distance readings.
