SURFACE DISTURBANCES DUE TO A DISLOCATION SOURCE IN A MULTI-LAYERED MEDIUM : DISTURBANCES AT TOKYO DUE TO A HYPOTHETICAL TOKAI EARTHQUAKE

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概要

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• Investigations into the surface disturbance associated with an earthquake have commonly based on the conception of body waves. New formulations are derived to seismograms inclusive of dispersive surface waves due to a dislocation source model in a multi-layered medium. It is known that high-frequency components are excluded from the theoretical seismograms. From the analysis of strong-motion accelerograms, empirical relations are established thereby estimate the maximum amplitudes for the case wherein short waves are included. Upon combining theoretical formualtions with the empirical relations mentioned above, the maximums of surface displacements, velocities and accelerations at Tokyo metropolis are estimated. These magnitudes might probably be realized by us in a Tokai earthquake in the future. As an overall average, the maximums so predicted are um = 38 cm, um = 53 kine and um = 280 gal, which appear in the surface-wave portions of seismograms.

• 日本自然災害学会の論文

著者

• Sato Ryosuke

  Geophysical Institute Faculty Of Science University Of Tokyo

関連論文

• SURFACE DISTURBANCES DUE TO A DISLOCATION SOURCE IN A MULTI-LAYERED MEDIUM : DISTURBANCES AT TOKYO DUE TO A HYPOTHETICAL TOKAI EARTHQUAKE
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