|Region: Caborn, 10 miles West of Evansville, Indiana|
|Time (gmt): 17:37:17.5|
|Magnitude: M 5.0 (PEPP/IU), Mw=4.6, ML=5.0 (LDEO)|
|Depth: 18 km|
Seismograms recorded by LCSN Station PAL (Palisades, NY)
Focal Mechanism by Waveform Moment Tensor Inversion
Source mechanism of the Caborn, Indiana, earthquake determined by using
seismic signals recorded at regional distance (from 123 to 581 km).
Waveform data are used to determine focal depth and source mechanism
parameters using moment tensor inversion method. This is a preliminary
results. Source mechanism indicates predominantly strike-slip motion
along steeply dipping fault planes striking due Northeast or Northwest
(298 degree). Source depth of 18 km fits the observed records best.
Focal depth has been constrained by comparing solutions for various
focal depths and finding the best fit synthetic seismograms that yield
smallest fitting errors between observed and synthetic traces.
June 18, 2002 earthquake and the Wabash Valley seismic zone
Location of the June 18, 2002 Caborn, Indiana earthquake. It occurred in the Wabash Valley seismic zone and perhaps along northeast trending compound Caborn fault.
Major Earthquakes in the Eastern United States