Geophysical confirmation of low-angle normal slip on the historically active Dixie Valley fault, Nevada
- Abbott, Robert E.
- Louie, John N.
- Caskey, John S.
- Pullammanappallil, Satish K.
DOIAbstract
The December 16, 1954, Dixie Valley earthquake (Ms = 6.8) followed the nearby Fairview Peak earthquake (Ms = 7.2) by 4 min, 20 s. Waveforms from the Fairview Peak event contaminate those from the Dixie Valley event, making accurate fault plane solutions impossible. A recent geologic study of surface rupture characteristics in southern Dixie Valley suggests that the Dixie Valley fault is low angle (<30°) along a significant portion of the 1954 rupture. To extend these observations into the subsurface, we conducted a seismic reflection and gravity experiment. Our results show that a portion of the Dixie Valley ruptures occurred along a fault dipping 25° to 30°. As such, the Dixie Valley event may represent the first large, low-angle normal ea...
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