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AGU: Geophysical Research Letters

 

Index Terms

  • Physical Properties of Rocks: Acoustic properties
  • Seismology: Body wave propagation
  • Tectonophysics: Stresses—crust and lithosphere

Abstract

Seismic wave velocity changes and stress build‐up in the crust of the Kanto‐Tokai Region

Muneyoshi Furumoto

Department of Earth Sciences, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920‐1192, Japan

Yuko Ichimori

Department of Earth Sciences, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920‐1192, Japan

Nobuhiko Hayashi

Department of Earth Sciences, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920‐1192, Japan

Yoshihiro Hiramatsu

Department of Earth Sciences, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920‐1192, Japan

Takashi Satoh

Geological Survey of Japan, Tsukuba, Ibaraki 305‐8567, Japan

We show there are large temporal P‐wave velocity changes in the crust of the Kanto‐Tokai region in Japan from repeated observations of explosions. We find that the variation is the response of the crustal rocks to two components of stress change, the tidal stress and the secular stress accumulation. The inferred annual rate of fractional velocity change (Δν/ν/year) caused by the stress accumulation in the upper crust is of the order of 10−3/year. The results indicate that the build‐up of stress in the crust can be monitored by precise observations of seismic wave velocities.

Received 12 March 2001; accepted 31 July 2001; .

Citation: Furumoto, M., Y. Ichimori, N. Hayashi, Y. Hiramatsu, and T. Satoh (2001), Seismic wave velocity changes and stress build‐up in the crust of the Kanto‐Tokai Region, Geophys. Res. Lett., 28(19), 3737–3740.

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