Automatic detection,location and quantification of earthquakes: Application to tsunami warning |
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| Authors: | D Reymond O Hyvernaud J Talandier |
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| Institution: | (1) Laboratoire de Détection et Géophysique, Commissariat à l'Energie Atomique et Centre Polynésien de Prévention de Tsunamis, Boîte Postale 640, Papeete, Tahiti, French Polynesia |
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| Abstract: | We describe a fully automated seismic event detection and location system, providing for real-time estimates of the epicentral parameters of both local and distant earthquakes. The system uses 12 telemetered short-period stations, with a regional aperture of 350 km, as well as two 3-component broad-band stations. Detection and location of teleseismic events is achieved independently and concurrently on the short-period and long-period channels. The long-period data is then used to obtain an estimate of the seismic momentM
0 of the earthquake through the mantle magnitudeM
m, as introduced byOkal andTalandier (1989). In turn, this estimate ofM
0 is used to infer the expected tsunami amplitude at Papeete, within 15 minutes of the recording of Rayleigh waves. The performance of the method is discussed in terms of the accuracy of the epicentral parameters and seismic moment obtained in real time, as compared to the values later published by the reporting agencies. Our estimates are usually within 3 degrees of the reported epicenter, and the standard deviation on the seismic moment only 0.19 unit of magnitude for a population of 154 teleseismic events. |
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| Keywords: | Earthquake detection automatic location tsunami warning French Polynesia |
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