Memphis Area Regional Seismic Network. Final report, October 1986--September 1992
- Memphis State Univ., TN (United States). Center for Earthquake Research and Information
The Memphis Area Regional Seismic Network (MARSN) has provided important southern coverage of the New Madrid seismic zone (NMSZ). One of the most important contributions of MARSN is to provide essential data for the successful identification of the Crittenden County fault zone which is located to the east and parallel to the south-west segment of the NMSZ. In addition to felt reports and earthquake locations, MARSN data has also been added into database obtained by the PANDA (Portable Array for Numerical Data Acquisition) experiment for a comprehensive seismological study of the NMSZ. Results from the PANDA experiment combined with regional seismic network data clearly demonstrate that the seismogenic zone in the NMSZ is mainly confined within depths ranging from 3 to 15 km. The SW, NW, and NE segments of the NMSZ are characterized by narrow vertical strike-slip faults. The central NMSZ is, however, very complicated. The northcentral NMSZ is characterized by a well-defined planar feature dipping {approximately} 31{degree} SW which shows dominantly normal faulting. The southcentral NMSZ is characterized by a {approximately} 48{degree} SW dipping fault which shows dominantly reverse faulting. Although the east-west compressional regional stress may play an important role in fault movements in the NMSZ, the complication in focal mechanism along each segment may suggest that other factors including postseismic relaxation by one or more of the 1811--1812 earthquakes, or the interactions between adjacent fault segments, or other tectonic features such as the right-lateral strike-slip Crittenden County Fault can not be overlooked in future tectonic studies of the NMSZ.
- Research Organization:
- Nuclear Regulatory Commission, Washington, DC (United States). Div. of Engineering; Memphis State Univ., TN (United States). Center for Earthquake Research and Information
- Sponsoring Organization:
- Nuclear Regulatory Commission, Washington, DC (United States)
- OSTI ID:
- 10140675
- Report Number(s):
- NUREG/CR-6209; ON: TI94009553; CNN: Contract NRC-04-86-120; TRN: AHC29408%%9
- Resource Relation:
- Other Information: PBD: Mar 1994
- Country of Publication:
- United States
- Language:
- English
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