The Aysen cluster is named for the Aysén Fjord in southern Chile. The
region has a very low rate of seismicity despite the presence of the
Liquiñe-Ofqui Fault System, a long strike-slip fault that accommodates
some of the relative motion between Nazca and South American plates. In
April 2007 the area experienced two M6 events and a strong aftershock
sequence from which this cluster is assembled. Location calibration is
dependent on arrival time data from two temporary network deployments,
kindly provided by Hans Agurto Detzel and Denis Legrand. Only seven of
the 32 events are recorded at teleseismic distances. All events have
depth constraint from free-depth relocation.
