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Brief Report for Saline River fault zone (Class B) No. 1026
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citation for this record: Crone, A.J., compiler, 1998, Fault number 1026, Saline River fault zone, 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 06:26 AM.
| Synopsis | Cox and Van Arsdale describe a northwesterly trending alignment of earthquake epicenters that follow the Saline River in central and southeastern Arkansas and is colinear with the northeastern margin of the Monroe uplift. Geomorphic evidence has been used to suggest that the Monroe uplift is the site of late Quaternary deformation [1025]. The epicenter alignment is cited as evidence that active structures exist in the area of the Saline River lineament. In their search for surficial expression of these active structures, Cox and Van Arsdale describe several small-displacement faults having various strikes that are exposed in several road cuts along a 2.2-km-long section of U.S. Highway 425, south of Monticello, Arkansas. The faults and minor deformation exposed in these road cuts and in nearby trenches that they excavated are small-scale features; the relationship of these features to deeper structures and to the diffuse regional seismicity are not well determined and therefore, these features (collectively named the Saline River fault zone by Cox and Van Arsdale) are classified as Class B features. This classification is further justified because no compelling evidence indicates that the faults visible at the surface are related to a significant seismogenic source that might generate damaging earthquakes. |
| County(s) and State(s) | |
| AMS sheet(s) | Greenwood |
| Physiographic province(s) | |
| Length (km) | 0 km. |
| Average strike | |
| Sense of movement | Normal; Reverse; Dextral; Sinistral |
| Dip Direction | SW; NW; SE; NE |
| Historic earthquake | |
| Most recent prehistoric deformation | Latest Quaternary (<15 ka) |
| Slip-rate category | Less than 0.2 mm/yr |
| Date and Compiler(s) | 1998 Anthony J. Crone, U.S. Geological Survey |
