高松南部の新発見クレータ構造の研究

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Author: 河野, 芳輝ほか

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Publication date: 1996-04-14

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Note (General)：: 金沢大学理学部A crater-like structure was found in the south of Takamatsu city, Kagawa prefecture, western Japan. This may be the first finding of an impact ...

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Material Type: 文書・図像類
Title: 高松南部の新発見クレータ構造の研究
Author/Editor: 河野, 芳輝
Kono, Yoshiteru
Author Heading: 河野, 芳輝
Kono, Yoshiteru
Publication Date: 1996-04-14
Publication Date (W3CDTF): 1996-04-14
Alternative Title: Study of a Crater Structure found in the south of Takamatsu City, Kagawa Prefecture, Japan Professor
Periodical title: 平成6(1994)年度科学研究費補助金一般研究(B) 研究成果報告書概要 = 1994 Fiscal Year Final Research Report Summary
No. or year of volume/issue: 1992-1994
Volume: 1992-1994
Pages: 2p.-
Text Language Code: jpn
Subject Heading: クレータ
高松クレータ
隕石衝突孔
重力異常
地震波反射法
地磁気異常
impact crater
gravity anomaly
Takamatsu crater
geomagnetic anomaly
caldera
crater structure
Target Audience: 一般
Note (General): 金沢大学理学部
A crater-like structure was found in the south of Takamatsu city, Kagawa prefecture, western Japan. This may be the first finding of an impact crater in Japan.The structure was firstly detected by a abnormal value of gravity which is obtained in a course of regional gravity measurements over the Japanese Islands by us. After several tens of gravity measurements around the anomalous data point, depression of gravity anomaly appeared clearly. This crater was named as the Takamatsu crater. Topography around the crater is nearly flat and no geographical manifestation to indicate a crater-like structure beneath the earth's surface.More than 500 gravity measurements, geomagnetic anomaly measurements at more than 100 points and 2 sections of reflecting seismic wave measurements were carried out over and around the crater.Gravity and seismological analysis revealed that the crater is 4 km in diameter and 1.5 km in depth. The structure presumably buried by about 100 m thick Quaternary sediments.There are two hypothesis about origin of the Takamatsu crater. One is meteorite impact origin, i.e., impact crater. The other is volcanic eruption origin, i.e., caldera.Already some characteristic minerals are found from the crater area suggesting meteoritic impact origin.This crater also contains great amount of underground water. Since the crater has not only scientific values but also economical values, we hope that deep drillings undertaken in this crater.
本研究は,我が国で初めての隕石衝突孔(Impact Crater)の発見と考えられる「高松クレータ」の地下構造調査に関するものである.これまで科学研究費の助成を受けて重力異常(500点)以外の方法でも地下構造を確認すべく,地磁気異常(110点),地震波反射法(2測線)などの地球物理学的探査を行ない,クレータの構造をかなり明確に描くことに成功した.すなわちこのクレータの直系は4km,深さ1.5kmであることが明らかになった.本年度はこれまでの観測資料の整理・解析を進めると共に,地質学,鉱物学の情報を総合し,このクレータの成因に関して研究を深めた.この成因説としては隕石衝突説と火山カルデラ説とが考えられた.しかし,予想よりも早く隕石衝突を裏付ける鉱物がこの研究の途中から生じた共同研究者によって発見され,隕石衝突孔である可能性が極めて高くなった.火山活動が無い安定大陸ではこれらの鉱物が発見されただけで隕石衝突孔と認定されるほどの証拠能力をもっている.このように各分野の研究者の関心も高まり,この研究が一層発展する素地ができた.地元高松市周辺でも市民の関心が高い.それと言うのも日本で初めての隕石孔というだけでなく,膨大な水資源としての現実的価値も有するからである.成因を明らかにする学術的目的だけでなく経済的価値を検討するためにも今後1000m級の深層ボーリングの実施を含めて多方面からの研究が切に求められる.
研究課題/領域番号:04452063, 研究期間(年度):1992-1994
出典：研究課題「高松南部の新発見クレータ構造の研究」課題番号04452063（KAKEN：科学研究費助成事業データベース（国立情報学研究所））（https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-04452063/044520631994kenkyu_seika_hokoku_gaiyo/）を加工して作成
DOI: 10.24517/00057262
Access Restrictions: 限定公開
Related Material: https://kaken.nii.ac.jp/search/?qm=80019489
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-04452063/
https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-04452063/044520631994kenkyu_seika_hokoku_gaiyo/
Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
https://irdb.nii.ac.jp
Original Data Provider (Database): 金沢大学 : 金沢大学学術情報リポジトリKURA