Algorithm for Fast Evaluation of Tsunami Danger for Near Field Event

Abstract

In this paper, we discuss two algorithms designed to reduce the time required for tsunami danger evaluation. The first one makes it possible to provide a realistic approximation of tsunami source parameters provided that the sensors (bottom pressure recorders) are properly located. It is based on minimizing the difference between the actual tsunami record and the linear combination of synthetic mareograms preliminary obtained by numerical modeling of a tsunami generated by so-called unit sources. Only a part of the wave first period is used. This can help to restore the tsunami source a few minutes earlier than using full wave length. Wave propagation through the water area under study is simulated on a personal computer with the hardware acceleration. Specialized printed board with the Field Programmable Gates Array is used. The calculation is accelerated by using a computing pipeline implemented on several calculators available on the mentioned above printed board. Both algorithms require about two minutes to deliver wave heights maxima distribution along the coast.