Abstract
We have developed an integrated system to estimate tsunami risk quantitatively. It relies merely on a broad-band long-period three components seismic station linked to a personnal computer. The algorithm includes automatic detection of P,S, Rayleigh and Love waves and location of the epicenter. The latter is estimated exclusively from long period data: epicentral distance is obtained from S — P delay times and source azimuth from the polarity of P waves in the horizontal plane. The seismic moment is calculated through the mantle magnitude Mm computed from spectral amplitudes of Rayleigh and Love waves over a broad range of periods (50 to 300 s.). The seismic moment is then used to compute an expected tsunami height, taking into account corrections due to epicentral distance. It can also be ultimately corrected after previous study for site effects such as run-up, resonance of bays, etc.
Both the mantle magnitude Mm and the relationship between seismic moment and tsunami amplitude on the high seas are fully justified on theoretical bases, and have been verified experimentally on extensive datasets. This system has been fully operational and running satisfactorily since 1987 at the Polynesian Tsunami Warning center (CPPT). It can be used either in far-field or in near-field, at distances as small as 1.5°.
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© 1993 Springer Science+Business Media Dordrecht
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Reymond, D., Hyvernaud, O., Talandier, J. (1993). An Integrated System for Real Time Estimation of Seismic Source Parameters and Its Application to Tsunami Warning. In: Tinti, S. (eds) Tsunamis in the World. Advances in Natural and Technological Hazards Research, vol 1. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-3620-6_14
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DOI: https://doi.org/10.1007/978-94-017-3620-6_14
Publisher Name: Springer, Dordrecht
Print ISBN: 978-90-481-4283-5
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