2:15 PM - 2:30 PM
[HDS11-08] Feasibility Study of Tsunami Wave Source Estimation by Joint Inversion Using Tsunami-generated Infrasound Waves
Keywords:Joint Inversion, tsunami source estimation, infrasound, atmospheric pressure wave, tsunami, large-scale numerical simulation
Atmospheric pressure changes associated with the generation of tsunamis during large earthquakes have long been observed with tsunami generation have been observed, and which has been subject to various research efforts.
During the Tohoku-Pacific Ocean Earthquake, our research group succeeded in observing the infrasound waves induced by the tsunami.
Since infrasound propagates through the atmosphere at a faster speed than tsunami, it is expected to be applied to early tsunami detection.
We believe that the use of infrasound as one of the targets of tsunami detection will further improve the robustness and stability of tsunami detection.
We have implemented a large-scale numerical simulation of the propagation of infrasound by tsunamis, considering wave source and atmospheric models, and proposed a time-domain numerical method to numerically reproduce the propagation phenomena of infrasound caused by tsunamis.
Furthermore, we proposed a method to estimate the tsunami source by inversion using the developed numerical simulation model of infrasound.
In this study, we propose a new method of wave source estimation by joint inversion, which combines infrasound and tsunami wave signals. The wave source of infrasound is the sea surface uplift caused by tsunamis, and therefore, it is very similar to the tsunami wave source. We expect that the tsunami source estimation using the proposed inversion method is promising as a more robust early tsunami detection method.
During the Tohoku-Pacific Ocean Earthquake, our research group succeeded in observing the infrasound waves induced by the tsunami.
Since infrasound propagates through the atmosphere at a faster speed than tsunami, it is expected to be applied to early tsunami detection.
We believe that the use of infrasound as one of the targets of tsunami detection will further improve the robustness and stability of tsunami detection.
We have implemented a large-scale numerical simulation of the propagation of infrasound by tsunamis, considering wave source and atmospheric models, and proposed a time-domain numerical method to numerically reproduce the propagation phenomena of infrasound caused by tsunamis.
Furthermore, we proposed a method to estimate the tsunami source by inversion using the developed numerical simulation model of infrasound.
In this study, we propose a new method of wave source estimation by joint inversion, which combines infrasound and tsunami wave signals. The wave source of infrasound is the sea surface uplift caused by tsunamis, and therefore, it is very similar to the tsunami wave source. We expect that the tsunami source estimation using the proposed inversion method is promising as a more robust early tsunami detection method.