The Ferron cluster is named for the town of Ferron in central Utah. The
cluster is based on a pair of moderate magnitude events: 5.9 mb on
August 14, 1988 (known as the San Rafael Swell event) and 5.0 mb on
January 30, 1989 (Southern Wasatch Plateau event). The region is
moderately active seismically with small events associated with the
western margin of the Colorado Plateau. The cluster retains a large
number of those smaller events to improved statical power for the
location calibration. Regional distance observations are abundant and
the cluster carries a modest number of teleseismic observations.
Azimuthal coverage is excellent. Except for one event (the Southern
Wasatch Plateau event on January 30, 1989) whose depth is constrained by
teleseismic depth phases, all events have depth control from near-source
or local-distance readings.
