Event location in the Middle East and North Africa

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The Lawrence Livermore National Laboratory (LLNL) CTBT R{ampersand}D program has made significant progress towards improving the ability of the IMS seismic network to locate small-magnitude events in the Middle East and North Africa (MIYNA). Given that high-grade ground truth (such as known explosions) has been difficult to obtain in these regions, we have placed a significant effort towards the development of a teleseismically constrained seismic database that provides event locations good to within 20m km. This data set is used to make an initial evaluation of the effectiveness of calibration on the proposed seismic IMS network in the MWNA. Utilizing ... continued below

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13 p.

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Schultz, C. A.; Myers, S. C. & Ruppert, S. D. July 1, 1997.

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Description

The Lawrence Livermore National Laboratory (LLNL) CTBT R{ampersand}D program has made significant progress towards improving the ability of the IMS seismic network to locate small-magnitude events in the Middle East and North Africa (MIYNA). Given that high-grade ground truth (such as known explosions) has been difficult to obtain in these regions, we have placed a significant effort towards the development of a teleseismically constrained seismic database that provides event locations good to within 20m km. This data set is used to make an initial evaluation of the effectiveness of calibration on the proposed seismic IMS network in the MWNA. Utilizing a surrogate IMS regional network in the Middle East we find that when a seismic event lies within the footprint of the recording network the uncalibrated event locations are good to within about 25 km of the teleseismically constrained (TC) location. Using region-specific static station corrections further reduces this difference to about 20 km. To obtain further improvement in location accuracy we have used the modified kriging technique developed by SNL to interpolate new travel-time corrections. We compare this technique withe other robust linear interpolation techniques with the goal of enhancing the estimation of travel-time corrections. This is important to TC events which we find can have large uncorrelated uncertainties. Finally, we are making a large effort to incorporate LLNL analyst picks on primary and secondary phases and develop azimuth and slownsess estimates horn current IMS arrays to improve/supplement the NEIC picks.

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13 p.

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OSTI as DE98057439

Other: FDE: PDF; PL:

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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: DE98057439
  • Report No.: UCRL-JC--127895
  • Report No.: CONF-970967--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 649235
  • Archival Resource Key: ark:/67531/metadc712379

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  • July 1, 1997

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 10, 2017, 1:28 p.m.

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Schultz, C. A.; Myers, S. C. & Ruppert, S. D. Event location in the Middle East and North Africa, article, July 1, 1997; California. (digital.library.unt.edu/ark:/67531/metadc712379/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.