[M-TT38] Brand-new scope of coupling geophysics being established by infrasound and associated waves

[MTT38-08] Effects of selection of observation points for Tsunami source estimation method using infrasound-based inversion

*Masami Tokuda¹, Yoshiki Saito¹, Kan Okubo¹ (1.Tokyo Metropolitan University)

Keywords:Infrasound, Atmospheric pressure wave, Tsunami, Tsunami source estimation, Inversion

A new tsunami detection method using infrasound waves (atmospheric pressure waves) generated by tsunamis has been proposed. The atmospheric pressure change at the time of a tsunami has long been observed and reported. These infrasound fluctuations propagate through the atmosphere at nearly the speed of sound; in many cases, they reach the land before the tsunami. Therefore, the possibility of early tsunami detection is discussed by estimating the tsunami source from the observed infrasound fluctuations. In this method, barometers for observing infrasound fluctuations can be relatively easily installed on land, which may be useful in terms of maintenance cost and flexibility of deployment.
This proposal for tsunami source estimation by infrasound-based inversion has been examined using an actual tsunami as a model.
However, quantitative evaluation of the validity of this method is not sufficient. In particular, there is no detailed study on the relationship between the arrangement of observation points (number, location, etc.) and the results of source estimation.
Therefore, this study investigates and reports the relationship between the placement of observation points and the results of source estimation using a simple numerical model and the checkerboard test.