Tidal Response of Seismic Wave Velocity at Shallow Crust in Japan
Takano, T. and K. Nishida, 2023, Tidal response of seismic wave velocity at shallow crust in Japan, Geophysical Research Letters, 50(9), e2023GL103011. [PDF]
To systematically evaluate the tidal response to velocity variations, we developed a new method that utilized the flexibility of a state-space model. We extracted the tidal response from hourly stacked noise autocorrelations using a seismic interferometry method throughout Japan. In particular, large tide-induced seismic velocity changes were observed in the low S-wave velocity region of the shallow crust. The tidal responses of velocity variations can provide new insights into the response mechanisms of the shallow crust to applied strain.