Rainfall Effect on the Tilt Observations at Usami, the Izu Peninsula

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  • 宇佐美臨時観測点における降水量と傾斜観測の関係
  • ウサミ リンジ カンソクテン ニ オケル コウスイリョウ ト ケイシャ カンソ

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The purpose of the present study is to clarify the precipitation effects on crustal tilt at the Usami observation site, the northern part of the Izu Peninsula. The measure ments have been carried out by using two sets of TEM-tiltmeter since July 1979. There is a small fault across the observation vault, and the tiltmeters are established on both the sides of the fault. The observed results of tilt are so much affected by rainfall, that the method using a linear transfer function is applied to the observed results to cancel out the rainfall effects. It is proved that the transfer function is well consistent with the tank model procedure. The transfer function method is applied to the tilt data obtained before and after an earthquake of M 6.7 occurred nearby the observation site. The pre- and coseismic tilt changes are clarified by the prediction using the transfer function.

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