HR: 1340h
AN: S43A-1059    [Abstracts]
TI: The Enhancement of the Stations ALMAR and ERMAR for Signal Detection and Seismic Phase Identification at Regional and Teleseismic Monitoring
AU: * Tundev, D
EM: dugarmaa@rcag.url.mn
AF: Research Center of Astronomy and Geophysics of Mongolian Academy of Sciences, RCAG, MAS P.O.Box-152, Ulaanbaatar-51, Mongolia, Ulaanbaatar, 210351, Mongolia
AU: Chimed, O
EM: odon@rcag.url.mn
AF: Research Center of Astronomy and Geophysics of Mongolian Academy of Sciences, RCAG, MAS P.O.Box-152, Ulaanbaatar-51, Mongolia, Ulaanbaatar, 210351, Mongolia
AU: Munkhuu, U
EM: ulzibat@rcag.url.mn
AF: Research Center of Astronomy and Geophysics of Mongolian Academy of Sciences, RCAG, MAS P.O.Box-152, Ulaanbaatar-51, Mongolia, Ulaanbaatar, 210351, Mongolia
AU: Dorjsuren, A
EM: d_ankhaa@rcag.url.mn
AF: Research Center of Astronomy and Geophysics of Mongolian Academy of Sciences, RCAG, MAS P.O.Box-152, Ulaanbaatar-51, Mongolia, Ulaanbaatar, 210351, Mongolia
AU: Adiya, M
EM: moogii@rcag.url.mn
AF: Research Center of Astronomy and Geophysics of Mongolian Academy of Sciences, RCAG, MAS P.O.Box-152, Ulaanbaatar-51, Mongolia, Ulaanbaatar, 210351, Mongolia
AU: Dashdondog, M
EM: mongon@rcag.url.mn
AF: Research Center of Astronomy and Geophysics of Mongolian Academy of Sciences, RCAG, MAS P.O.Box-152, Ulaanbaatar-51, Mongolia, Ulaanbaatar, 210351, Mongolia
AU: Tsagaan, B
EM: bsb@rcag.url.mn
AF: Research Center of Astronomy and Geophysics of Mongolian Academy of Sciences, RCAG, MAS P.O.Box-152, Ulaanbaatar-51, Mongolia, Ulaanbaatar, 210351, Mongolia
AB: This study is focused enhancement of the Mongolian borehole seismic array stations ALMAR and ERMAR. We determined most effective filter range for detection processing of signals for regional and teleseismic events and systematic deviation of azimuth and slowness values from theoretical ones for various regional and teleseismic phases for several seismic zones. In addition, we construct attenuation parameter this stations using amplitude and period measurements. In this study, we selected several regional and teleseismic events from IDC and seismic catalogue of RCAG, which are detected both ALMAR and ERMAR stations. We specially choose events large enough to be well located, so that we can expect to measure the errors in azimuth and slowness associated with the array analysis.
In order to determine most effective filters for regional and teleseismic detection, we manually tune F-K analysis F-statistic parameter and noise, event spectrum comparison. For all events, we applied different filters for each phases and determine most suitable filters for each phases. Then we made several statistical analyses given results to be determining average applicable filter ranges.
To be determining theoretical azimuth and slowness we used IASPEI model and TAUP software in MATLAB. To determine deviation of azimuth from theoretical ones for various teleseismic and regional phases, first, we calculate Delta azimuth for all events and plotted in geographical map, then we determine seismic zones, which are give azimuth deviation greater than 2 degrees. For example in case of ALMAR station: We found most effective filter range of teleseismic events for P phase is 0.3-1.5hz and regional events Pn, Pg and Lg phases 0.9-0.4hz, 0.8-3.5hz and 0.5-4.0hz respectively. For the biggest azimuth deviation found 280°-20° degree with value 6.1±4.6, 6.08±3.7 and 5.95±3.8 for Pn, Pg and Lg phases respectively.
DE: 7200 SEISMOLOGY
DE: 7219 Seismic monitoring and test-ban treaty verification
SC: Seismology [S]
MN: 2007 Fall Meeting