U.S. Geological
Survey
Open-File Report 01-502
Relationship of Faults in Basin Sediments to the Gravity and Magnetic Expression of their Underlying Fault Systems
By
Christopher A. Baldyga
Gravity and
magnetic surveys were performed along the western flanks of the Santa
Rita Mountain range located in southeastern Arizona to develop an understanding
of the relationship between surface fault scarps within the basin fill
sediments and theirgeophysical response of the faults at depth within
the bedrock. Data were acquired for three profiles, one of them along
the northern terrace of Montosa Canyon, and the other two along the northern
and southern terraces of Cottonwood Canyon. A total of 122 gravity stations
were established as well as numerous magnetic data collected by a truckmounted
cesium-vapor magnetometer. In addition, aeromagnetic data previously acquired
were interpreted to obtain a geologically sound model, which produced
a good Gravity anomalies
associated with faults exhibiting surface rupture were more pronounced
than the respective magnetic anomalies. More credence was given to the
gravity data when determining fault structures and it was found in all
three profiles that faults at depth projected through alluvium at a steeper
dip than the bedrock fault |
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Created: 6-11-01
Last modified: 6-11-01 (cad)
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