[HDS13-P06] Can we detect tsunami magnetic signals at on-land observatories prior to tsunami arrivals? : From the perspective of numerical experiments
Keywords:tsunami, electromagnetic, simulation
We conduct three-dimensional simulations of TGM signals to investigate feasibility of using on-land magnetic data for tsunami early warning, with the aid of the finite element simulation code by Minami et al. (2017). This study focuses on three devastating tsunami events in the past, the 1960 Chilean tsunami (Mw 9.5), the 2011 Tohoku tsunami (Mw 9.0), and the 1707 Hoei tsunami (Mw 8.7). For the three tsunamis, we adopt the source models of Ho et al. (2019), Satake et al. (2013), and Furumura et al. (2010), respectively. Although all the three large tsunamis did extensive damage, features of their topographies are distinct from each other. One of the features of coastlines in Tohoku is ria coast, while Nankai area of Japan includes capes and bays. As for Chilean coast for the 1960 event, a straight long coastline is present in the vicinity of Santiago, Chile. We set many virtual magnetic observatories and tide stations along the coastlines and investigate arrival times of tsunamis and TGM signals. In the presentation, we compare the arrival times of tsunamis and TGM signals at each virtual observatory and to discuss feasibility of using on-land TGM signals for tsunami hazard mitigation.