書誌事項
- タイトル別名
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- Coseismic Changes in Water Temperature at Yudani Hot Spring in Tottori Prefecture, Japan
- トットリケン ユダニ オンセン ノ コサイスミック ナ スイオン ヘンカ ニツ
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抄録
We have observed precise groundwater temperature at Yudani hot spring in Tottori Prefecture, Japan since September 1991. The resolution of the temperature measurement is 0.001°C. The same observation was done from May 1983 to July 1984, with lower resolution of 0.01°C. The groundwater temperature has periodic fluctuations mainly induced by the earth tides. The temperature also changes due to atmospheric pressure and sometimes has clear coseismic rises. Such coseismic rise was observed 7 times with very similar patterns. Generally, the felt earthquakes at Yudani hot spring with JMA intensity 3 or greater coincides with the coseismic groundwater temperature changes and unfelt distant large earthquakes sometimes caused the same coseismic changes. These changes might have been caused by volumetric strain changes induced by tides, atmospheric pressure and earthquakes and we calculated respective strain sensitivity of the groundwater temperature. The sensitivity from the response to the atmospheric pressure is nearly equal to that from the tidal response (1.10m°C/10-8 strain). However, the sensitivities estimated from the coseismic temperature changes and the static strain steps which were calculated from the earthquake fault model in a homogeneous elastic half space are more than 1000 times larger than the sensitivity from the tidal response. Therefore, the coseismic static strain steps cannot explain these coseismic changes on the groundwater temperature. We propose that these changes are caused by local strain release induced by the seismic waves which have little effect on the seismic intensity.
収録刊行物
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- 地震 第２輯
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地震 第２輯 48 (3), 315-329, 1995
公益社団法人 日本地震学会
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詳細情報 詳細情報について
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- CRID
- 1390282679283047296
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- NII論文ID
- 10002499808
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- NII書誌ID
- AN00305741
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- ISSN
- 18839029
- 2186599X
- 00371114
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- NDL書誌ID
- 3636692
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- データソース種別
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- JaLC
- NDL
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