| Abstract: | 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 their
geophysical 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
fit to the data.
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
indicating brittle behavior within the overlying sediments. The gravity data also detected
a significant horst and graben structure within Cottonwood Canyon. The aeromagnetic
data did not provide any insight into the response of the minor faults but rather served to
verify the regional response of the whole profile. |
| Genre: | USGS Numbered Series |
| ProdID: | 50470 |
| Citation Author: | Baldyga, Christopher A. |
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| Citation Edition: | Version 1.0 |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | 113 p. |
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| Citation Series: | Open-File Report |
| Citation Series Code: | OFR |
| Citation Series Number: | 2001-502 |
| Citation Search Results Text: | Relationship of faults in basin sediments to the gravity and magnetic expression of their underlying fault systems; 2001; OFR; 2001-502; Baldyga, Christopher A. |
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| Citation Year: | 2001 |
| Type: | citation/reference |
| Text: | Relationship of faults in basin sediments to the gravity and magnetic expression of their underlying fault systems; 2001; OFR; 2001-502; Baldyga, Christopher A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| URL (INDEX PAGE): | http://geopubs.wr.usgs.gov/open-file/of01-502/ |
| Date Other: | Sun, 1 Jun 2003 00:00 -0500 |
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