Comprehensive study of the seismotectonics of the eastern Aleutian arc and associated volcanic systems. Annual progress report, March 1, 1979-February 29, 1980

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Description

The modern and historic seismicity of the eastern Aleutian arc was thoroughly researched and shows clear evidence that the Shumagin Islands region of the arc has been ruptured at least partly by previous large or great earthquakes; has recurrence times for large earthquakes between 50 and 115 years; has presently the properties of a seismic gap, i.e., was not ruptured by a large or great earthquake for at least 76 years; shows a donut configuration of modest seismicity including high-stress-drop events around the rim of the expected rupture zone of a future large earthquake. From this combined evidence it is ... continued below

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Pages: 111

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Jacob, K.H.; Davies, J.N. & Sykes, L.R. January 1, 1979.

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Description

The modern and historic seismicity of the eastern Aleutian arc was thoroughly researched and shows clear evidence that the Shumagin Islands region of the arc has been ruptured at least partly by previous large or great earthquakes; has recurrence times for large earthquakes between 50 and 115 years; has presently the properties of a seismic gap, i.e., was not ruptured by a large or great earthquake for at least 76 years; shows a donut configuration of modest seismicity including high-stress-drop events around the rim of the expected rupture zone of a future large earthquake. From this combined evidence it is concluded that the likelihood for a large or great earthquake to occur within the Shumagin Island gap is high (about 50% probability) within the next decade and very high (about 80% to 90% probability) within the next three decades. This study includes detailed determinations of stress, stress-drop, and other source parameters of moderate earthquakes in the Shumagin islands gap, and similar results for the St. Elias earthquake near the Yakataga gap in the eastern Gulf of Alaska. Volcano seismicity, crustal deformantion, and P-residuals continue to be monitored and analyzed in the eastern Aleutian arc segment. 36 figures, 3 tables.

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Pages: 111

Notes

Dep. NTIS, PC A06/MF A01.

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  • Report No.: COO-3134-20
  • Grant Number: EY-76-S-02-3134
  • DOI: 10.2172/5731791 | External Link
  • Office of Scientific & Technical Information Report Number: 5731791
  • Archival Resource Key: ark:/67531/metadc1093810

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 1, 1979

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

Description Last Updated

  • March 22, 2018, 3:53 p.m.

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Jacob, K.H.; Davies, J.N. & Sykes, L.R. Comprehensive study of the seismotectonics of the eastern Aleutian arc and associated volcanic systems. Annual progress report, March 1, 1979-February 29, 1980, report, January 1, 1979; United States. (digital.library.unt.edu/ark:/67531/metadc1093810/: accessed April 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.