深部ボアホール観測のための地殻活動総合観測装置および地殻応力測定装置の開発と興味ある成果の例

• 山内 常生

  名古屋大学大学院環境学研究科地震火山・防災研究センター

• 石井 紘

  財団法人地震予知総合研究振興会 東濃地震科学研究所

• 浅井 康広

  財団法人地震予知総合研究振興会 東濃地震科学研究所

• 大久保 慎人

  財団法人地震予知総合研究振興会 東濃地震科学研究所

• 松本 滋夫

  東京大学地震研究所

• 吾妻 瞬一

  名古屋大学大学院環境学研究科地震火山・防災研究センター 現所属: 応用地質株式会社中部支社

書誌事項

タイトル別名

• Development of Deep Borehole Instruments for Both Multi-Component Observation and <i>in situ</i> Stress Measurement, and Some Interesting Results Obtained
• シンブ ボアホール カンソク ノ タメ ノ チカク カツドウ ソウゴウ カンソク ソウチ オヨビ チカク オウリョク ソクテイ ソウチ ノ カイハツ ト キョウミ アル セイカ ノ レイ

抄録

We have developed multi-component borehole instruments for borehole stations deeper than 1000m. The instruments are composed of 7 strainmeter components (4 horizontal, 2 inclined, and 1 vertical), 2 tiltmeters, 3 seismometers, 4 magnetometers, and a high-resolution thermometer. The instruments are also equipped with new systems for data transmission and data monitoring, even during installation, and for determining the instrument direction at the bottom of the borehole. We have also developed an intelligent-type strainmeter based on the Ishii-type strainmeter for measuring in situ stresses. It is equipped with strain sensors, an A/D converter, a CPU, a memory, and a battery, and it has no outside cable. It is cemented into a deep borehole with expansion grout and then taken out by overcoring after it has coupled with the basement rock. By this procedure we can estimate in situ rock stresses. Observation in deep boreholes can avoid the problems of both artificial noise and meteorological disturbance. It enables the performance of high S/N ratio observations for detecting very small signals. The results obtained from deep borehole observations on the Izu Peninsula and in the Tono area of Gifu Prefecture have shown some interesting variations of strains and tilts related to the precursory phenomena of earthquakes. An example of in situ stress determination has also been demonstrated. In the case of deep borehole observation, we first measure the in situ stresses and then install a multi-component borehole instrument to monitor crustal activity. By this process we can continuously monitor stress variation. This kind of stress monitoring is very important in earthquake prediction research.

収録刊行物

• 地震　第２輯

  地震　第２輯 58 (1), 1-14, 2005

  公益社団法人 日本地震学会

キーワード

• Multi-component borehole instrument
• Cableless intelligent type strain meter
• Monitoring of crustal activities
• <i>In situ</i> stress measurement
• Precursory phenomena of earthquake

詳細情報

• CRID: 1390282679282262912
• NII論文ID: 10016161261
• NII論文ID: 10019540984
• NII書誌ID: AN00305741
• DOI: 10.4294/zisin1948.58.1_1
• ISSN: 18839029
• ISSN: 2186599X
• ISSN: 00371114
• ISSN: http://id.crossref.org/issn/00371114
• NDL書誌ID: 7699242
• Web Site: http://id.ndl.go.jp/bib/7699242
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7699242
• Web Site: https://www.jstage.jst.go.jp/article/zisin1948/58/1/58_1_1/_pdf
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
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