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CONSTRUCTION OF GRAVITY DATA-BASE IN SOUTHWEST JAPAN

日本西南部重力数据库建设

基本信息

批准号：
07640552
负责人：
SHICHI Ryuichi
金额：
$ 1.54万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07640552/
关键词：
Southwest Japan Gravity database Vanishing the blank area Dense gravity measurements Total revision of data accuracy Precise gravity anomaly map Steep gravity gradient belt Active fault 制度改定データベース空白解消重力急変帯活断層地質構造線

项目摘要

The purpose of present project is to create a gravity database to cover all over the southwest Japan by developping the achievement of the former two projects of gravity study in the area (Grant-in Aid for Scientific Research (C), No.01540331,1989-1991 ; and Grant-in Aid for Scientific Research (C), No.04640400,1992-1994).During the last three years of present project, Nagoya University and Shimane University made gravity measurements extensively and stored 13,517 and 2,795 points of new data, respectively. Through this work, large parts of the blank area still remaind in the southwest Japan that distributed in western Chugoku, Hokuriku, central Kyushu districts were vanished and changed to the area densely filled up with precise gravity data. Besides this, very dense gravity measurements were made at the areas tectoniccaly important such as (1) surrounding area of seismic sourse region of the 1995 southern Hyogo-Ken Earthquake, (2) Tokai district ranged from Yoro mountains to Ooigawa … More through Nobi Plain, (3) central Hokuriku district surrounding the Toyama Bay, and so on. On the other hand, we collected a large number of gravity data from more than 20 institutions and organizations, and performed total revision of accuracy on all of the collected data to keep a high precision. The gravity database thus we constructed containes now more than 11,1000 points of net data, and covers uniformly and very densely almost all southwest Japan, west of Fossa Magna. All of the gravity data are registered in the gravity database with very high precision of 1 magal or better.By utilizing this high precision gravity database, we are able to draw precise gravity anomaly maps at any portion, in any scale size, as we wish. Form those, we can recognize following factors : 1) Distinct linearments are delineated along major geological tectonic lines, such as Median tectonic line, Akaishi tectonic line, Atera fault and so on. 2) Steep garvty gradient belts are deliniated very sharply along the major active faults and geological faults such as the Rokko fault system, the Yoro fault, the Isurugi fault, and so on. 3) A new geological fault ; Himi fault was found out from the densely measured gravity data. As the result of geological survey, it is considered to be not an active fault. 4) Many linearments deliniated only on the gravity maps are found out at anywhere. They are not known so far by other geophysical or geological means. Less

本项目的目的是通过发展前两个项目在该地区的重力研究成果，建立一个覆盖整个日本西南部的重力数据库（科研资助（C），第01540331号，1989 -1991 ;在本项目的最后三年中，名古屋大学和岛根大学进行了广泛的重力测量，储存了13,517和2,795个新的数据点，分别通过这项工作，日本西南部分布在中国西部、北陆、九州中部地区的大部分空白区消失了，变成了精密重力数据密集区。除此之外，在构造重要的地区，如（1）1995年兵库县南部地震震源区的周边地区，（2）东海地区从四郎山到大井川，进行了非常密集的重力测量 ...更多信息（3）北陆中部地区围绕富山湾等。另一方面，我们收集了20多个机构和组织的大量重力数据，并对所有收集的数据进行了全面的精度修正，以保持较高的精度。这样，我们建立的重力数据库现在包含超过11，1000个点的净数据，并均匀和非常密集地覆盖了几乎整个日本西南部，大窝以西。所有重力数据都以1马加尔或更好的极高精度登记在重力数据库中。通过利用这个高精度重力数据库，我们可以根据需要绘制任何部分、任何比例尺大小的精确重力异常图。从中我们可以认识到以下因素：（1）沿中央构造线、赤石构造线、Atera断层等主要地质构造线沿着划分出明显的线性构造，（2）沿六甲断层系、与罗断层、矶木断层等主要活动断层和地质断层沿着划分出非常陡的重力梯度带，（3）一条新的地质断层;根据密集的重力测量资料，发现了Himi断层。根据地质调查结果，它被认为不是活动断层。4)许多只在重力图上画出的线性线在任何地方都能找到。迄今为止，还没有通过其他地球物理或地质手段了解它们。少