Relocation of Gulf of Aqaba earthquakes using the JSOP Bulletin

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Ground truth information (i.e. precise information about the hypocenter and origin time of aseismic event) is difficult to obtain in the Middle East and North Africa region. One source of ground truth we are attempting to exploit is data from local seismic networks. An electronic bulletin from the second phase of the Joint Seismic Observation Period (JSOP), with participating countries in the eastern Mediterranean region, provides a source of local network data not ordinarily available. I have used JSOP bulletin data for the period January 1996 through June 1996 to relocate over 100 earthquakes occurring in and around the Gulf ... continued below

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13 p.

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Sweeney, J.J. July 3, 1997.

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Description

Ground truth information (i.e. precise information about the hypocenter and origin time of aseismic event) is difficult to obtain in the Middle East and North Africa region. One source of ground truth we are attempting to exploit is data from local seismic networks. An electronic bulletin from the second phase of the Joint Seismic Observation Period (JSOP), with participating countries in the eastern Mediterranean region, provides a source of local network data not ordinarily available. I have used JSOP bulletin data for the period January 1996 through June 1996 to relocate over 100 earthquakes occurring in and around the Gulf of Aqaba. Fourteen of these earthquakes have picks in the bulletin for stations surrounding the Gulf (Egypt Saudi Arabia, Israel,and Jordan). The rest of the data involves picks for stations either in Israel, Jordan, and Saudi Arabia (east side and north of the Gulf) or for stations in Israel, Jordan, and Egypt (west side and north of the Gulf). The VELEST code (Joint Hypocenter Determination method) was used to calculate improved locations (over what can be obtained from single event determinations--SED with poor station configurations) for the all the earthquakes in the data set. Location differences between the JHD solution and SED are discussed, along with determination of the minimum 1-Velocity model. Waveform correlation was used to validate observed event clusters in the VELEST solutions. This provided evidence that some of the VELEST solutions are more accurate than NEIC solutions. The subset of 14 events with good station coverage provides a good set of ground truth (location uncertainty {lt}5 km). The rest of the events are probably located more accurately with local data than is available from NEIC determinations, but such a conclusion needs to be supported by further study.

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13 p.

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OSTI as DE98052179

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: DE98052179
  • Report No.: UCRL-JC--127882
  • Report No.: CONF-970967--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 589720
  • Archival Resource Key: ark:/67531/metadc689574

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  • July 3, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • April 10, 2017, 1:30 p.m.

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Sweeney, J.J. Relocation of Gulf of Aqaba earthquakes using the JSOP Bulletin, article, July 3, 1997; California. (digital.library.unt.edu/ark:/67531/metadc689574/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.