Seasonal Crustal Seismic Velocity Changes Throughout Japan

Journal of Geophysical Research: Solid Earth - Tập 122 Số 10 - Trang 7987-8002 - 2017
Qing‐Yu Wang1, Florent Brenguier1, Michel Campillo1, Albanne Lecointre1, Tetsuya Takeda2,3, Yosuke Aoki4
1University Grenoble Alpes & CNRS, ISTerre, Grenoble, France
2Ministry of Education, Culture, Sports, Science and Technology, Tokyo, Japan
3National Research Institute for Earth Science and Disaster Prevention, Tsukuba, Japan
4Earthquake Research Institute, University of Tokyo, Tokyo, Japan

Tóm tắt

AbstractNoise‐based crustal seismic velocity changes are known to be affected by environmental perturbations, such as rainfall, atmospheric pressure loading, and temperature changes. Similar to geodetic observations, these external perturbations can mask the effects of tectonic and volcanic processes. In this study, we benefit from the dense Hi‐net short‐period seismic network that covers the entire Japan to measure continuous changes in seismic velocities over a few years, using noise‐based seismic monitoring. Some strong seasonal seismic velocity changes are observed in both southern Japan (Kyushu Island) and northern Japan (Hokkaido Island). Decreasing of seismic velocities in summer in southern Japan can be clearly explained by a model of increased crustal fluid pore pressure associated with high rainfall. In northern Japan, it is necessary to adopt a more complex model to explain the observed seismic velocity variations, which takes into account precipitation, snow depth, and sea level changes. Moreover, western and eastern Hokkaido Island show very different responses to these different external perturbations. The models developed are used to remove the seasonal components of the seismic velocity changes. The minimum remaining detectable seismic velocity change reduces to 10−5, which allows detection of crustal responses to small earthquakes that are previously hidden in the strong seasonal perturbations.

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Thông tin
Thông tin xuất bản

Journal of Geophysical Research: Solid Earth

Tập 122 Số 10

7987-8002

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