Validation of tectonic models for an intraplate seismic zone, Charleston, South Carolina, with GPS geodetic data

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Although the average strain rate in intraplate settings is 2--3 orders of magnitude lower than at plate boundaries, there are pockets of high strain rates within intraplate regions. The results of a Global Positioning System survey near the location of current seismicity (and the inferred location of the destructive 1886 Charleston, South Carolina earthquake) suggest that there is anomalous strain build-up occurring there. By reoccupying 1930 triangulation and 1980 GPS sites with six Trimble SST dual frequency receivers, a strain rate of 0.4 {times} 10{sup {minus}7} yr{sup {minus}1} was observed. At the 95% confidence level, this value is not significant; ... continued below

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53 p.

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Talwani, P.; Kellogg, J.N. & Trenkamp, R. February 1, 1997.

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Description

Although the average strain rate in intraplate settings is 2--3 orders of magnitude lower than at plate boundaries, there are pockets of high strain rates within intraplate regions. The results of a Global Positioning System survey near the location of current seismicity (and the inferred location of the destructive 1886 Charleston, South Carolina earthquake) suggest that there is anomalous strain build-up occurring there. By reoccupying 1930 triangulation and 1980 GPS sites with six Trimble SST dual frequency receivers, a strain rate of 0.4 {times} 10{sup {minus}7} yr{sup {minus}1} was observed. At the 95% confidence level, this value is not significant; however, at a lower level of confidence ({approximately} 85%) it is about two orders of magnitude greater than the background of 10{sup {minus}9} to 10{sup {minus}10} yr{sup {minus}1}. The direction of contraction inferred from the GPS survey 66{degree} {+-} 11{degree} is in excellent agreement with the direction of the maximum horizontal stress (N 60{degree} E) in the area, suggesting that the observed strain rate is also real. 66 refs.

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53 p.

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INIS; OSTI as TI97004342

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  • Other Information: PBD: Feb 1997

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  • Other: TI97004342
  • Report No.: NUREG/CR--6529
  • DOI: 10.2172/446309 | External Link
  • Office of Scientific & Technical Information Report Number: 446309
  • Archival Resource Key: ark:/67531/metadc674278

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  • February 1, 1997

Added to The UNT Digital Library

  • July 25, 2015, 2:21 a.m.

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  • April 8, 2016, 8:23 p.m.

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Talwani, P.; Kellogg, J.N. & Trenkamp, R. Validation of tectonic models for an intraplate seismic zone, Charleston, South Carolina, with GPS geodetic data, report, February 1, 1997; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc674278/: accessed August 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.