November 1995 Bordertown Earthquake
The location of the November 15, 1995, M 4.6 earthquake (depth 13.7 km)
near Bordertown, NV, approximately 15 km northwest of Reno. Also shown
are the locations of aftershocks recored on the UNRSL regional seismic
network. The earthquake and several of the larger aftershocks were felt
throughout the Reno Area. The larger white feature in the center of the
image is White Lake. The large circle is the location of the M 4.6 main
event and the three next largest circles are the locations of the M 3+
aftershocks. BRD1 and BRD2 are where portable seismic instruments were
installed by the University of Nevada Seismological Laboratory following the
earthquake. These stations were operated for two weeks and recorded approximately 100 aftershocks. Most of these aftershocks were too small to be felt or recorded on the regional seismic network. The earthquake locations were
determined by Gene Ichinose of the Seismological Laboratory. The north striking blue line is the surface projection of the steeply west dipping fault plane
from the Berkeley full-waveform focal mechanism inversion and the east-west
striking blue line is an estimate of the error for the surface projection
of the fault based on the uncertainties in the depth determination. The image
is an air-photo warped to a UTM projection. Tic marks are a 1 km intervals.
The north striking geomorphic feature on the west side of the image west
of the earthquake locations if the Dog Valley fault zone. Based on the
focal mechanism determined for main earthquake, this is not the operative
fault for the Bordertown earthquake. (Note: the image spans approximately 10 km
east-west and the hypocenter of the earthquake was at a depth of 13.7 km.)
Ken Smith
ken@seismo.unr.edu
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