ＶＬＦ‐ＭＴ法による火山地域の地質構造探査　（２）　富士山北西麓を例にして

• 河西 秀夫

  山梨学院大学

書誌事項

タイトル別名

• VLF-MT Survey of Geological Structure at Volcano Area. Part 2: A Case Study in the Northwestern Foot of Mt. Fuji.
• VLF MTホウ ニ ヨル カザン チイキ ノ チシツ コウゾウ タンサ 2
• Part 2: A Case Study in the Northwestern Foot of Mt. Fuji
• 富士山北西麓を例にして (2)

抄録

VLF-MT survey was performed over the volcanic ejecta zone in northern foot of Mt. Fuji (Tateishi, Kamiyoshida, Fujiyoshida city, prefecture Yamanashi), and the geological structure is estimated, and the limitationof VLF-MT survey is discussed. This area is characterized by volcanic ejecta (tuff breccia, scoria and so on) resulted from the eruption of Mt. Fuji volcano. The instrument used in this survey is TeraTecnica VL-101equipment.<BR>VLF-MT measurments were made along 14 lines using 50 m station interval, apparent resistivity, phase anglebetween magnetic field and electric field, magnetic field strength and electric field strength are measured ateach station. The value of apparent resistivity of this area ranged in magnitude from 200 ohm-m to 1000 ohm-m.The electric field have considerable variation in value throughout the area, but the magnetic field have little variation.For this reason, the variation of the apparent resistivity has been considered to be due to the variation in theelectric field. When interpreting the structure by two-layer model, evaluation of the resistivity of the top layer pimust to be done. The resistivity of the top layer pi is evaluated by the following manner: value for apparentresistivity at station where has value for phase angle between 43-47 degree is regarded as the value for pi, andthis value is used as pi near the station. The result of the VLF-MT survey is compared with known electrical prospecting data from the same localities.<BR>The result is as follows:<BR>(1) The VLF-MT resistivity profiles are in general agreement with the profiles obtained from the electricalprospecting, <BR>(2) In the VLF-MT survey, multilayer which each layer have similar resistivity value is interpreted as theuniform layer.The result of survey indicate that VLF-MT method is useful for estimating the geological structure in the volcanicarea where no outcrops are present.

収録刊行物

• 応用地質

  応用地質 35 (3), 84-92, 1994

  一般社団法人 日本応用地質学会

キーワード

• VLF-MT法
• 火山
• 現場測定
• 比抵抗

詳細情報

• CRID: 1390001204096419584
• NII論文ID: 110003334729
• NII書誌ID: AN00026635
• DOI: 10.5110/jjseg.35.84
• ISSN: 18840973
• ISSN: 02867737
• NDL書誌ID: 3889412
• Web Site: http://id.ndl.go.jp/bib/3889412
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3889412
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可