Caldera structure inferred from gravity anomalies west of Nagamachi-Rifu Fault, Northeast Japan.

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概要

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• A gravity survey was conducted in and around the Nagamachi-Rifu Fault. The density for both terrain and Bouguer corrections was chosen to be 2, 300 kg/m<SUP>3</SUP>, because volcanic rocks are dominant over the whole measurement area and the surface layer density is estimated to be low from geological considerations. The Bouguer anomalies are characterized by a low anomaly similar to those of a caldera and the basement structure inferred from two and three-dimensional analysis shows that the depth is often more than 1 km in the caldera region and that there is a circular structure. The gradient of basement is steepest at the southern margin, and it resembles to rim of funnel-shaped caldera.

• 公益社団法人 日本地震学会、地球電磁気・地球惑星圏学会 、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会の論文

著者

• Mishina Masaaki

  Tohoku University

• KOMAZAWA Masao

  National Institute of Advanced Industrial Science and Technology

関連論文

• Caldera structure inferred from gravity anomalies west of Nagamachi-Rifu Fault, Northeast Japan
• Density structure inferred from gravity anomalies in the eastern area of the Itoigawa-Shizuoka Tectonic Line, central Japan
• Caldera structure inferred from gravity anomalies west of Nagamachi-Rifu Fault, Northeast Japan.

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