Evaluation of hypotheses for the cause of the 1886 Charleston earthquake

White, R.; Long, Leland Timothy

doi:10.2172/5557889

Cited by 3 publications

(2 citation statements)

References 65 publications

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“…Many hypotheses are available to explain the causal relations between earthquakes and structures in intraplate seismic zones [Dewey, 1984;White and Long, 1989]. Most contemporary hypotheses suggest that intraplate seismicity results from the reactivation of preexisting faults [e.g., Zoback, 1992] or from local stress perturbations caused by lateral variations in the physical properties of the crust [e.g., Long and Zelt, 1991 ].…”

Section: Introductionmentioning

confidence: 99%

Velocity structure and seismicity of southeastern Tennessee

Kaufmann¹,

Long²

1996

J. Geophys. Res.

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The seismic zone in southeastern Tennessee is at the confluence of major crustal features, which have been interpreted largely from potential data, and their relation to seismicity could help us understand why major earthquakes sometimes occur in the eastern United States. In this paper we solve for the previously unknown velocity structure of the upper crust by an inversion of travel time residuals from relocated earthquakes. The gravity anomalies are included by using a linear relation between average anomalous density and average anomalous velocity. The velocity model demonstrates that the seismicity is concentrated in areas of average to below average velocity and does not appear to be associated with one of the previously identified major crustal features. The high-velocity zones mark areas that are generally lacking in seismicity. The association of earthquake hypocenters with regions of low-velocity crustal rocks is consistent with other intraplate seismic zones, and this association supports the conjecture that intraplate earthquakes occur in crust that may have been weakened. The velocity anomalies at midcrustal depths do not support the New York-Allabama (NY-AL) lineament as a linear feature extending through southeastern Tennessee and parallel to contours in gravity anomalies as originally proposed. A continuation of the (NY-AL) lineament to the southwest requires either a 15 degree southwestward change in direction or a displacement to be consistent with the velocity anomalies. The seismically active areas in southeastern Tennessee do not appear to be constrained by the major crustal features, but instead, the seismicity is characterized by the distribution of hypocenters and their association with low-velocity regions at midcrustal depths.

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Section: Introductionmentioning

confidence: 99%

Velocity structure and seismicity of southeastern Tennessee

Kaufmann¹,

Long²

1996

J. Geophys. Res.

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“…There may also be a drag or push exerted at the base of the lithosphere by mantle convection (Zoback and Zoback, 1980). Average stress orientation in the eastem U.S. is northeasterly (White and Long, 1989) with some variation in the Appalachian orogenic system. Causal mechanisms at this level were not addressed in the work reported on here.…”

Section: Geological Interpretationmentioning

confidence: 99%

Piedmont seismic reflection study: A program integrated with tectonics to probe the cause of eastern seismicity

Glover¹,

Çoruh²,

Costain³

1992

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Although the listing that follows represents the majority of documents cited In NRC publications. It Is not Intended to be exhaustive. Referenced documents available for Inspection and copying for a fee from the NRC Public Document RoomInclude NRC correspondence and Internal NRC memoranda; NRC bulletins, circulars, information notices. Inspection and Investigation notices; licensee event reports; vendor reports and correspondence; Commission papers; and applicant and licensee documents and correspondence.The following documents In the NUREG series are available for purchase from the GPO Sales Program: formal NRC staff and contractor reports, NRC-sponsored conference proceedings, international agreement reports, grant publications, and NRC booklets and brochures. Also available are regulatory guides, NRC regulations In the Code of Federal Regulations, and Nuclear Regulatory Commission Issuances. Documents available from the National Technical Information Service Include NUREG-serles reports and technical reports prepared by other Federal agencies and reports prepared by the Atomic Energy Commission, forerunner agency to the Nuclear Regulatory Commission. Documents available from public and special technical librariesInclude all open literature Items, such as books, journal articles, and transactions. Federal Register notices. Federal and State legislation, and congressional reports can usually be obtained from these libraries. Documents such as theses, dissertations, foreign reports and translations, and non-NRC conference proceedings are available for purchase from the organization sponsoring the publication cited.Single copies of NRC draft reports are available free, to the extent of supply, upon written request to the

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Fault plane solutions and relocations of recent earthquakes in Middleton Place Summerville Seismic Zone near Charleston, South Carolina

Madabhushi

Talwani

1993

Bulletin of the Seismological Society of America

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The Middleton Place Summerville Seismic Zone (MPSSZ), located about 20 km northwest of Charleston is the most active seismic zone in South Carolina. Between 1980 and 1991, 58 events with Md 0.8 to 3.3 were recorded in MPSSZ. They lie in a diffuse area of 11 km by 14 km of which over two-thirds are located in a narrow 5 km by 6-km zone. The hypocentral depths range from 2 to 11 km with over 90% deeper than 4 km. Single fault plane solutions were obtained for 35 events. Based on the focal mechanisms the earthquakes were grouped into five subsets. The mean P-axis of all fault plane solutions is oriented N63°E, in general agreement with the direction of SHmax obtained from in situ stress measurements. Of the 35 events, 18 are associated with reverse faulting on NW - SE striking and SW dipping fault planes. These events were inferred to be associated with the Ashley River fault zone, which is not a planar feature, but is composed of short segments of varying strikes (N20°W to N70°W) and dips (40° to 70°SW). Eleven events were associated with strike-slip motion on NNE - SSW striking vertical faults and with thrust faulting on N - S oriented faults dipping to the west, respectively. These two sets are identified as being parts of the Woodstock fault zone. The concentrated zone of seismicity included events associated with both the ARF and WF zones suggesting that it is at the intersection of these two fault zones.

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Evaluation of hypotheses for the cause of the 1886 Charleston earthquake

Cited by 3 publications

References 65 publications

Velocity structure and seismicity of southeastern Tennessee

Velocity structure and seismicity of southeastern Tennessee

Piedmont seismic reflection study: A program integrated with tectonics to probe the cause of eastern seismicity

Fault plane solutions and relocations of recent earthquakes in Middleton Place Summerville Seismic Zone near Charleston, South Carolina

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