Can T phases be used to map blockage?

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The placement of stations in a CTBT hydroacoustic monitoring network is controlled, in large part, by the presence of bathymetric features or land masses that block propagation. In the absence of blocking features, propagation is very efficient in the SOFAR channel, allowing surveillance over large basins with hydrophone networks that are sparse compared to seismic networks. Blockage can be estimated from theoretical calculations of acoustic attenuation. While calibration of attenuation with controlled sources is best, it is also prohibitively expensive. The T phases generated by undersea earthquakes are known to be sensitive to interruptions of the SOFAR channel. Earthquakes along ... continued below

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16 p.

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Harris, D. & Hauk, T. May 1, 1995.

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The placement of stations in a CTBT hydroacoustic monitoring network is controlled, in large part, by the presence of bathymetric features or land masses that block propagation. In the absence of blocking features, propagation is very efficient in the SOFAR channel, allowing surveillance over large basins with hydrophone networks that are sparse compared to seismic networks. Blockage can be estimated from theoretical calculations of acoustic attenuation. While calibration of attenuation with controlled sources is best, it is also prohibitively expensive. The T phases generated by undersea earthquakes are known to be sensitive to interruptions of the SOFAR channel. Earthquakes along ridges may illuminate regions of interest to define blockage areas. Our initial examination of T phase amplitudes suggests that T phases can be used to map blockage or other strong path attenuation. The principal difficulty to be surmounted is the ambiguity between source coupling and path attenuation. We are attempting to quantify coupling with a probabilistic model, which would permit us to estimate attenuation and to quantify the reliability of the estimate.

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16 p.

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OSTI as DE95013309

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  • 1995 monitoring technologies conference, Chantilly, VA (United States), 15-18 May 1995

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  • Other: DE95013309
  • Report No.: UCRL-JC--120952
  • Report No.: CONF-9505222--1
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 79755
  • Archival Resource Key: ark:/67531/metadc738392

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  • May 1, 1995

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  • Oct. 19, 2015, 7:39 p.m.

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  • Feb. 16, 2016, 2:37 p.m.

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Harris, D. & Hauk, T. Can T phases be used to map blockage?, article, May 1, 1995; California. (digital.library.unt.edu/ark:/67531/metadc738392/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.