Anomalous wave propagation across the South Caspian Basin

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The Caspian basin blocks the propagation of the regional seismic phase Lg and this has importance consequences for seismic discrimination in the Middle East. Intermediate period surface waves propagating across the basin are also severely affected. In a separate study we have developed a crustal model of the south Caspian basin and the surrounding region. The crust of the basin consists of 15-25 km of low velocity, highly attenuating sediments lying on high velocity crystalline crust. The Moho beneath the basin is at a depth of about 30 km as compared to about 50 km in the surrounding region. In ... continued below

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12 p.

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Priestly, K.; Patton, H.J. & Schultz, C. October 1, 1997.

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The Caspian basin blocks the propagation of the regional seismic phase Lg and this has importance consequences for seismic discrimination in the Middle East. Intermediate period surface waves propagating across the basin are also severely affected. In a separate study we have developed a crustal model of the south Caspian basin and the surrounding region. The crust of the basin consists of 15-25 km of low velocity, highly attenuating sediments lying on high velocity crystalline crust. The Moho beneath the basin is at a depth of about 30 km as compared to about 50 km in the surrounding region. In this study we used an idealized rendition of this crustal model to compute hybrid normal mode finite difference synthetic seismograms to identify the features of the Caspian basin which lead to the seismic blockage. Of the various features of the basin, the thickness and attenuation of the sediments appear to be the dominant blocking mechanism.

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12 p.

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OSTI as DE98000828

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  • Research symposium on monitoring a comprehensive test ban treaty, Orlando, FL (United States), 23-25 Sep 1997

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  • Other: DE98000828
  • Report No.: LA-UR--97-2777
  • Report No.: CONF-970967--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 626467
  • Archival Resource Key: ark:/67531/metadc693295

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  • October 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 29, 2016, 8:25 p.m.

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Priestly, K.; Patton, H.J. & Schultz, C. Anomalous wave propagation across the South Caspian Basin, article, October 1, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc693295/: accessed May 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.