HR: 15:25h
AN: S53C-08    [Abstracts]
TI: Real-time event location of California arrival data using a 2-station subarray
AU: Rydelek, P
EM: par@ceri.memphis.edu
AF: Center for Earthquake Research, The University of Memphis, 3890 Central Ave., Memphis, TN 38152 United States
AU: * Pujol, J
EM: jpujol@memphis.edu
AF: Department of Earth Sciences, The University of Memphis, Memphis, TN 38152 United States
AU: Horiuchi, S
EM: horiuchi@bosai.go.jp
AF: National Research Institute for Earth Science and Disaster Prevention, 3-1 Tennodai, Tsukuba, 305-0006 Japan
AB: A fundamental problem in seismology is earthquake location. It is especially important in real-time earthquake warning systems to locate a potentially hazardous earthquake as rapidly as possible in order to sound an alarm in the least amount of time. We have developed a method that uses only the two earliest p-wave arrival times in a seismic array. Assuming a simple velocity model in a region, which can be estimated from prior travel-time analysis, these first arrivals are used to construct a hyperbolic curve on which the approximate epicenter of the earthquake will lie. The information that p-waves have not yet arrived at the other stations in the seismic array is then used to further constrain the epicentral location along a segment of this hyperbola. For larger events, the inherent uncertainty in location along this segment may be acceptable in view of the time saved in not waiting for a more accurate location as other stations record their p-wave arrivals. We have begun to analyze larger events in the last several years recorded by California seismic networks and we will compare our results against locations of the same events determined by the real-time warning system presently in use in Japan.
DE: 7212 Earthquake ground motions and engineering seismology
DE: 7290 Computational seismology
DE: 7294 Seismic instruments and networks (0935, 3025)
DE: 7299 General or miscellaneous
SC: Seismology [S]
MN: Fall Meeting 2005