SPREADING OF GRAVIMETRIC RESULTS IN SOUTHWEST JAPAN AND GRAVITY DATABASE CONSTRUCTION OF WHOLE JAPANESE ISLANDS

本项目是根据这两个目标来规划和推进的。一是发布在日本西南部建立的重力数据库，并传播其重力测量结果。二是启动覆盖整个日本岛屿的重力数据库建设，使所有原始重力数据能够向公众开放。日本西南重力数据库的主体框架是在发展前4个科研资助项目（1989-1991年度科研资助项目（01540331）、04640400）成果的基础上建立起来的。编号：07640552（1995-1997）、11440130（1999-2000）。通过整理收集到的所有数据，我们完成了日本西南部重力数据库，并于2001年作为《名古屋大学博物馆公报》的专题报告发表（gravity Research Group in Southwest Japan, 2001；代表：R.Shichi and a.a yamamoto）。此外，日本地质调查局（现为国家先进工业科学技术研究所）于2000年出版了名为“日本重力（CD-ROM）”的重力数据库。通过合并这两个数据库，我们编译了一个新的覆盖整个日本岛屿的重力数据库（JGDB）。关于该数据库JGDB的数据覆盖范围，日本东北地区仍有部分空白区域。然而，日本西南部几乎完全被均匀分布的密集重力数据覆盖，精度非常高，小于1mgal。利用日本西南部的这一有利条件，我们计划出版一份重力地图集，命名为“日本群岛重力地图集——日本西南部和日本中部”。这只是本项目第一个目标的具体计划，我们已经完成了手稿的准备。至于第二个目标，我们开始收集和编辑现有的尚未发表的数据。此时，我们主要收集了数万个重力数据，分布在北海道和关东地区。它们现在正在再版中。少

Present project was planned and promoted with the two objectives. One is to issue gravity database constructed in Southwest Japan and to spread its gravimetric results. The other is to start gravity database construction to cover whole Japanese islands and to make all the original gravity data possible for public use.Main frame of our gravity database in Southwest Japan was well founded by developing the achievements of former four projects (the same category of Grant-in-Aid for Scientific Research : No.01540331 in 1989-1991, No.04640400. in 1992-1994, No.07640552 in 1995-1997 and No.11440130 in 1999-2000). By compiling all the data thus collected, we completed the gravity database in Southwest Japan which was published as a special roport of the Bulletin of the Nagoya University Museum in 2001 (Gravity Research Group in Southwest Japan, 2001; Representatives: R.Shichi and A.Yamamoto). Besides this, the gravity database called "Gravity (CD-ROM) of Japan" had been published in 2000 from … More the Geological Survey of Japan (present: National Institute of Advanced Industrial Science and Technology). By merging these two databases, we compiled a new gravity database to cover whole Japanese islands (JGDB). As concerned to the data coverage of this database JGDB, there still remains some parts of blank area in Northeast Japan. However, Southwest Japan is almost completely coverd with evenly distributed dense gravity data with very high precision of less than 1 mgal.By utilizing this desirable condition in Southwest Japan, we planned to publish a gravity atlas under a name "Gravity Atlas of Japanese Islands --Southwest Japan and Central Japan--". This is nothing but the concrete plan for the first objective of present project, and we have already finished preparation of the manusclipts.As for the second objective, we started working to collect and edit the existing data still remained unpublished. At this moment, we collected several tens of thousands gravity data mainly, distributed in Hokkaido and Kanto districts. They are now under edition. Less