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.
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