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Brief Report for Gulf-margin normal faults, Alabama and Florida (Class B) No. 2654
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citation for this record: Wheeler, R.L., compiler, 1998, Fault number 2654, Gulf-margin normal faults, Alabama and Florida, in Quaternary fault and fold database of the United States: U.S. Geological Survey website, http://earthquakes.usgs.gov/regional/qfaults, accessed 11/24/2009 06:07 AM.
| Synopsis | A belt of mostly seaward-facing normal faults borders the northern Gulf of Mexico in westernmost Florida, southwestern Alabama, southern Mississippi, all of Louisiana and southernmost Arkansas, and eastern and southern Texas (Ewing and Lopez, 1991 #2032). For the purposes of his compilation, the Gulf Coast faults are divided in four large groups because they number in the hundreds. To reflect regional differences in the characteristics of the faults, those in Florida and Alabama (described here) are evaluated together in a single group, as are those in Mississippi, those in Louisiana and Arkansas, and those in Texas.
Because numerous individual faults are combined into a single group for this compilation, it is not possible to provide to provide digital information about the azimuth, length, and dip of each individual fault.
The gulf-margin normal faults in Alabama and Florida are assigned as Class B structures because their low seismicity and because they may be decoupled from underlying crust, making it unclear if they can generate significant seismic ruptures that could cause damaging ground motion. |
| County(s) and State(s) | |
| AMS sheet(s) | Andalusia Mobile |
| Physiographic province(s) | |
| Length (km) | 0 km. |
| Average strike | |
| Sense of movement | Normal |
| Dip Direction | SW; NE |
| Historic earthquake | |
| Most recent prehistoric deformation | Quaternary (<1.6 Ma) |
| Slip-rate category | Less than 0.2 mm/yr |
| Date and Compiler(s) | 1998 Russell L. Wheeler, U.S. Geological Survey |
