Development of "Atlas of reverse faults in terms of gravity anomaly" using precise gravity anomaly data

2016 Fiscal Year Final Research Report

• Project/Area Number: 26400450
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Solid earth and planetary physics
• Research Institution: Kanazawa University
• Principal Investigator: Hiramatsu Yoshihiro 金沢大学, 自然システム学系, 教授 (80283092)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 重力異常 / 活断層 / 密度構造 / 断層構造 / セグメンテーション / 重力勾配テンソル

Outline of Final Research Achievements

(1) We made a precise gravity anomaly dataset from the compilation of previously reported datasets and the utilization of a high density digital elevation data, (2) performed gravity observations and two-dimensional density structure analyses in/around 43 major reverse fault zones in northeastern Japan to elucidate subsurface fault structures, and (3) conducted structural parameters analyses using gravity gradient tensor for those faults zones and the fault zones around the source area of the 2016 Kumamoto earthquake. From these analyses, we have evaluated the continuity and the segmentation of the subsurface fault structure of the major reverse fault zones.

Free Research Field

固体地球物理学