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Title: Southern Appalachian Regional Seismic Network

The seismic activity in the southern Appalachian area was monitored by the Southern Appalachian Regional Seismic Network (SARSN) since late 1979 by the Center for Earthquake Research and Information (CERI) at Memphis State University. This network provides good spatial coverage for earthquake locations especially in east Tennessee. The level of activity concentrates more heavily in the Valley and Ridge province of eastern Tennessee, as opposed to the Blue Ridge or Inner Piedmont. The large majority of these events lie between New York - Alabama lineament and the Clingman/Ocoee lineament, magnetic anomalies produced by deep-seated basement structures. Therefore SARSN, even with its wide station spacing, has been able to define the essential first-order seismological characteristics of the Southern Appalachian seismic zone. The focal depths of the southeastern U.S. earthquakes concentrate between 8 and 16 km, occurring principally beneath the Appalachian overthrust. In cross-sectional views, the average seismicity is shallower to the east beneath the Blue Ridge and Piedmont provinces and deeper to the west beneath the Valley and Ridge and the North American craton. Results of recent focal mechanism studies by using the CERI digital earthquake catalog between October, 1986 and December, 1991, indicate that the basement of the Valley andmore » Ridge province is under a horizontal, NE-SW compressive stress. Right-lateral strike-slip faulting on nearly north-south fault planes is preferred because it agrees with the trend of the regional magnetic anomaly pattern.« less
Authors:
; ;  [1]
  1. Memphis State Univ., TN (United States). Center for Earthquake Research and Information
Publication Date:
OSTI Identifier:
10183221
Report Number(s):
NUREG/CR--6254
ON: TI94018626; TRN: 94:018951
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Aug 1994
Research Org:
Nuclear Regulatory Commission, Washington, DC (United States). Div. of Engineering; Memphis State Univ., TN (United States). Center for Earthquake Research and Information
Sponsoring Org:
Nuclear Regulatory Commission, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 54 ENVIRONMENTAL SCIENCES; APPALACHIAN MOUNTAINS; SEISMICITY; EARTHQUAKES; COMPILED DATA; SEISMIC ARRAYS; SEISMIC DETECTION; GEOLOGIC STRUCTURES; EARTHQUAKE MAGNITUDE; GEOLOGIC FAULTS; US NRC; HYPOCENTERS 580000; 540250; GEOSCIENCES; SITE RESOURCE AND USE STUDIES