NUREG/CR-4502, Forwards Camera Ready Copy of NUREG/CR-4502, Virginia Regional Seismic Network, Final Rept for 1977 - 1985,for Publication.Completed NRC Forms 335 & 426A Encl.Inclusion of Contract Number on Title Page Requested.W/O NUREG

Forwards Camera Ready Copy of NUREG/CR-4502, Virginia Regional Seismic Network, Final Rept for 1977 - 1985,for Publication.Completed NRC Forms 335 & 426A Encl.Inclusion of Contract Number on Title Page Requested.W/O NUREG

ML20137N334
Person / Time
Issue date:	01/14/1986
From:	Beratan L NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES)
To:	Larkins P NRC OFFICE OF ADMINISTRATION (ADM)
References
CON-FIN-B-6249, CON-NRC-04-77-134, CON-NRC-4-77-134, RTR-NUREG-CR-4502 NUDOCS 8602030030
Download: ML20137N334 (6)

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yn 131986 MEMORANDUM FOR: Patricia Larkins Division of Technical Information and Document Control, ADM FROM: Leon L. Beratan, Chief Earth Sciences Branch Division of Radiation Programs and Earth Sciences, RES

SUBJECT:

TRANSMITTAL OF NUREG/CR-4502, " VIRGINIA REGIONAL SEISMIC NETWORK" FINAL REPORT (1977-1985)

Transmitted herewith is the camera ready copy of the subject report for publication as a NUREG document. Also enclosed are completed NRC forms 335 and 426A. Please include the contract number, NRC-04-77-134, on the title page.

Leon L. Beratan, Chief Earth Sciences Branch DRPES/RES

Enclosures:

3, as stated

Contact:

A. Murphy 42-74078 '_ -

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,2 SuPFLEvt%T.m. NOf t S Eight years of monitoring with a 20-station regional network has produced epicenters (M < 4), focal depths and mechanisms of adequate number and quality to reveal consider-able differences between the two seismically active portions of Virginia. Those two areas (southwestern (Giles County) and central parts of the state) are separated by only some 200 km. Despite their proximity, the two zones exhibit remarkable differences in geometrical / mechanical characteristics. In Giles County, seismic energy is released by predominately strike-slip faulting in a near vertical, tabular zone (' 40 km long) that is below the Appalachian decollement. In central Virginia, the seismicity is derived from mixed dip-slip and strike-slip faulting in a large, coin shaped volume

(' 100 km diameter; ' 10 km vertical thickness), above the major detachment faulting.

Stress estimates, as derived from single- and composite-focal mechanism solutions P-axes ,

are NE to ENE in Giles County and NW to NE in central Virginia.

The causes for the observed variability are unknown. The two zones are in different tectonostratigraphic (suspect) terranes and that difference could be relevant. The recently proposed Hydroseismicity model (Costain and Bollinger,1985) ascribes the observed seismicity variations in Virginia and throughout the Southeast to different drainage basin hydrologic characteristics plus differences in upper crustal fracturing.

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s MEMORANDUM FOR: Patricia Larkins Division of Technical Information and Document Control, ADM FROM: Leon L. Beratan, Chief Earth Sciences Branch Division of Radiation Programs and Earth Sciences, RES

SUBJECT:

TRANSMITTAL 0F NUREG/CR-4502, " VIRGINIA REGIONAL SEISMIC NETWORK" FINAL REPORT (1977-1985)

Transmitted herewith is the camera ready copy of the subject report for publication as a NUREG document. Also enclosed are completed NRC forms 335 and 426A. Please include the contract number, NRC-04-77-134, on the title page.

A/h Leon L. Beratan, Chief Earth Sciences Branch DRPES/RES

Enclosures:

3, as stated

Contact:

A. Murphy 42-74078 9

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Washington, D.C. 20555 1977-1985 12 SUPPLEYE%Taav NOTES 13 at$Yaac1 d200 wores or esas Eight years of monitoring with a 20-station regional network has produced epicenters (M < 4), focal depths and mechanisms of adequate number and quality to reveal consider-able differences between the two seismically active portions of Virginia. Those two areas (southwestern (Giles County) and central parts of the state) are separated by only some 200 km. Despite their proximity, the two zones exhibit remarkable differences in geometrical / mechanical characteristics. In Giles County, seismic energy is released by predominately strike-slip faulting in a near vertical, tabular zone (' 40 km long) that is below the Appalachian decollement. In central Virginia, the seismicity is derived from mixed dip-slip and strike-slip faulting in a large, coin shaped volume

(~ 100 km diameter; ' 10 km vertical thickness), above the major detachment faulting.

Stress estimates, as derived from single- and composite-focal mechanism solutions P-axes ,

are NE to ENE in Giles County and NW to NE in central Virginia.

The causes for the observed variability are unknown. The two zones are in different tectonostratigraphic (suspect) terranes and that difference could be relevant. The recently proposed Hydroseismicity model (Costain and Bollinger,1985) ascribes the observed seismicity variations in Virginia and throughout the Southeast to different drainage basin hydrologic characteristics plus differences in upper crustal fracturing.

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