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CONSTRUCTION OF A PRECISE GRAVITY ANOMALY MAP OVER THE EASTERN PART OF SOUTHWEST JAPAN,AND FORMATION OF GRAVITY DATABASE.

日本西南部东部地区精密重力异常图的构建及重力数据库的形成。

基本信息

批准号：
04640400
负责人：
SHICHI Ryuichi
金额：
$ 1.22万
依托单位：
NAGOYA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

项目摘要

Present study was executed to develop the achievement of the former work of gravity study in Southwest Japan (Grant-in-Aid for Scientific Research (C), No.01540331,1989-1991). Two objects aimed ; (1) to create a gravity database with high precision and (2) to construct a prcise gravity anomaly map to cover Southwest Japan were completely performed.We created a gravity database consisted of 85,000 by collecting data from more than 20 institutions and organizations. 29,000 among them are of our original. 9,600 data were newly measured to fill up blank area of data. By performing total revisions both for gravity reductions and coordinates readings, a high resolution of 1-0.5 mgal was obtained.A large sized precise Bouguer anomaly map was constructed and published in the area ranged from 132ﾟ E to Fossa-Magna where covered with densely distributed data. A couple of stereographic relief maps drawn in 1 and 2 million scales were issued from Geographical Survey Institute.Very characteristic gravity profiles are delineated on those maps.Factors recognized are : 1) Distinct linearments are delineated along major geological tectonic lines such as Median-tectonic line, and active faults such as Atera Fault. 2) A very large scale of steep gradient belt of gravity is running from Suruga Bay to north-eastern Shikoku through Chita Pneninsula by forming two large arcs. 3) Very strong steep gradient belts of gravity of middle to smale scale are found in various places. In many cases, they are associated with active faults. 4) There are founed many linearmaents not known so far by other geophysical or geological means. They are delineated only on the gravity anomaly maps very characteristically.

本研究是为了发展日本西南部重力研究的成果（科学研究资助（C），No.01540331，1989 -1991）而进行的。两个目标;（1）建立高精度的重力数据库;（2）建立覆盖日本西南部的高精度重力异常图。我们收集了20多个机构和组织的数据，建立了一个由85，000个数据组成的重力数据库。其中29，000人是我们的祖先。新增测量数据9,600条，填补数据空白。通过对重力折减和坐标读数的全面订正，获得了1 ~ 0. 5 mgal的高分辨率，编制并出版了132 ° E至Fossa-Magna的大面积精密布格异常图，数据分布密集。本文介绍了中国地质调查院100万和200万比例尺的赤平地形图，在这些地形图上描绘出了非常有特色的重力剖面，其特点是：（1）沿着主要地质构造线（如中构造线）和活动断层（如Atera断层）描绘出了明显的线性; 2)从骏河湾经赤塔平原到四国东北部，形成两条大弧，形成一条规模巨大的重力陡降带。3)在许多地方都发现了中、小型的重力陡梯度带。在许多情况下，它们与活动断层有关。4)发现了许多迄今为止用其他地球物理或地质方法所不知道的线性体。它们只在重力异常图上描绘得很有特色。