FISH: Quingyu Wang (U. Grenoble)
Friday, November 30, 2018 at 12:00pm to 1:00pm
Building 54, 54-209
21 AMES ST, Cambridge, MA 02139
Ambient Noise-based Seismic Monitoring of the Evolution of Mechanical Properties of the Crust beneath Japan
The Japanese High Sensitivity Seismograph Network (Hi-net) contains more than 1000 permanent stations, which provide sizeable continuous data sets throughout Japan. We benefit from both short period and tilt meters data downhole recordings to measure the seismic velocity variations, in the objective to follow the mechanical evolution of the crust at different time scales with a temporal resolution from monthly to daily in different period ranges (1 - 50 s).
The short period results help us better understanding the environmental seismology on the subsurface processes under the impacts of some surrounding environmental forcing such as hydrology, thermo-elasticity, and some direct loading effects. We identify the different environmental factors in charge of some local, seasonal effects and show how better understanding these environmentally induced crustal perturbations improves the observations of tectonic-induced seismic property changes.
The long period study focuses on the response of the crust to the Mw 9.0, 2011 Tohoku-oki earthquake. Spatio-temporal evolution of seismic velocity changes in different period bands reveals depth-dependent seismic responses. The result could have implications of both nonelastic response of the crust to large strain changes and/or a complex response of crustal seismic velocities to transient fluid flow.
About the Series
The Friday Informal Seminar Hour [FISH, Earth Resources Laboratory] is a postdoc-run weekly seminar series within the ERL. Topics include research relating to geophysics, and in particular seismology, with applications in Earth resources exploration such as e.g. seismics exploration, microseismicity, earthquake physics, and Earth imaging techniques. The seminars usually take place on Fridays at 12 noon in 54-209 (term-time only).
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