HR: 1340h
AN: S43B-1302    [Abstracts]
TI: Accurate earthquake location using automatically determined later phases
AU: Gischig, V
EM: gischigv@gmail.com
AF: ETH Zurich, ETH-Hoenggerberg, Zurich, 8093, Switzerland
AU: * Leonard, M
EM: Mark.Leonard@ga.gov.au
AF: Geoscience Australia, Cnr Jerrabomberra Ave & Hindmarsh Drive, Canberra, 2609, Australia
AU: Gorbatov, A
EM: Alexei.Gorbatov@ga.gov.au
AF: Geoscience Australia, Cnr Jerrabomberra Ave & Hindmarsh Drive, Canberra, 2609, Australia
AB: Within the development of the Australian Tsunami Warning System at Geoscience Australia attempts are being made to automatically detect the later phases pP, sP and S and to use them for more accurate locations. Therefore, the autoregressive method described in GSE/JAPAN/40 (1992) is included in the automatic earthquake location algorithm provided within the real-time system Antelope (developed by BRTT, Boulder, Colorado). This algorithm was applied to a database of waveforms recorded between January and February 2006. The arrival times determined with this method are compared with the results provided by the International Seismological Centre, ISC. For a mb=6.5 event it is shown, that it is possible to detect arrival times of later phases with this method. However, the onset times of the P-waves, mostly classified as emergent, are on average 0.2±0.4s later then reported by the ISC catalogue. For the S-arrivals the deviation is on average 1±1.8s.
DE: 7219 Seismic monitoring and test-ban treaty verification
DE: 7299 General or miscellaneous
SC: Seismology [S]
MN: 2007 Fall Meeting