COMPLETION OF GRAVITY DATABASE IN SOUTHWEST JAPAN AND PUBLICATION OF THE RESULTS

日本西南部重力数据库完成并公布结果

• 批准号: 11440130
• 负责人: YAMAZAKI Fumihito
• 金额: $ 7.74万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11440130/
• 关键词: Southwest Japan; Gravity database; Densely ditributed gravity data; Unified processing of gravity data; Overall revision; Precise gravity anomaly map; Data book; CD-ROM; 稠密性・均一性; データ分布の無空白化; 重力異常図

Present project was executed with two purposes(1)to complete a gravity database to cover all over the area of Southwest Japan by developping the achievements of the former three projects(on the same category of Grant-in-Aid for Scientific Research(C) : No.01540331 in 1989-1991, No.04640400 in 1992-1994 and No.07640552 in 1995-1997), and(2)to publish the results obtained through those projects. This goal of our project was successfully achieved.Gravity data in Southwest Japan have been accumulated and carefully compiled at Nagoya University from which we have completed an extensive and accurate gravity database. This database currently containes more than 146,000 of net gravity data collected from thirty nine institutes or otganizations, and it spatially covers whole the area of Southwest Japan with very densely distributed gravity data. There is no more any vacant area of gravity data except for limitted areas such as very high mountaineos zone. Collected data were all processed and ed … More ited by both Nagoya University and Hokkaido University. A unified processing of gravity data was performed on all the field data, and an overall revision was also made on all the data already published. The revisions performed are(1)normalization of the gravity values with an accuracy of about 0.2 mGal refening to the Japan Gravity Standardization Net 1996(JGSN96), (2)keeping the coordinae accuracy by an amount of 0.01 minute of arc for both latitudes and longitudes(less than 20 meters error of horizontal position), (3)keeping the altitude accuracy by an amount within a few meters error, and(4)revisions on the method for terrain correction and related data such as DEM data(KS-110-1)provided by Geografical Survey Institute. After performing those total revisions, we accomplished an overall accuracy of 1 mGal on all the data filed in the gravity database.Completion of this high quality gravity database enables us to utilize it for more better understanding of Japanese Islands not only in geophysical meanings but also in the other fields of geo-sciences. For this aim, we publish the results of the Gravity Database in Southwest Japan we constructed. The list we prepared are(1)large sized precise gravity anomaly tnaps ; 5 sheets, (2)a couple of gravity data books listed coordinates, gravity, and related values in a digital form, and(3)their machine-readable CD-ROM form. Less

本项目主要有两个目的：一是在前三个科研资助项目（1989-1991年第01540331号、1992-1994年第04640400号和1995-1997年第07640552号）的基础上，进一步发展和完善覆盖日本西南地区的重力数据库；二是发表这些项目的成果。我们项目的这个目标成功实现了。名古屋大学对日本西南部的重力数据进行了积累和仔细整理，并据此完成了一个广泛而准确的重力数据库。该数据库目前包含来自39个研究所或组织的14.6万多条净重力数据，在空间上覆盖了整个日本西南部地区，重力数据分布非常密集。除了非常高的山区等有限区域外，没有任何重力数据的空白区域。收集到的数据均经过处理和分析，并由名古屋大学和北海道大学联合使用。对所有野外数据进行了重力数据的统一处理，并对所有已公布的数据进行了全面修订。进行了修正：(1)参照日本重力标准化网1996（JGSN96）对重力值进行归一化，精度约为0.2 mGal;(2)保持经纬度坐标精度0.01分弧度（水平位置误差小于20米）；(3)保持高度精度在几米误差内。(4)地形校正方法及地理调查所提供的DEM数据（KS-110-1）等相关数据的修订。在完成这些总修订后，我们在重力数据库中所有数据字段上实现了1 mGal的总体精度。这个高质量的重力数据库的完成使我们能够利用它更好地了解日本群岛，不仅在地球物理意义上，而且在地球科学的其他领域。为此，我们公布了我们在日本西南部建立的重力数据库的结果。我们编制的清单有：(1)大型精确重力异常图；(2)几本重力数据书以数字形式列出坐标、重力和相关值，(3)它们的机器可读CD-ROM形式。少

项目成果

Yamamoto, A.: "Estimating the optimum reduction density for gravity anomaly : A theoretical overview"J.Fac.Sci., Hokkaido Univ.. 11, No.3. 577-599 (1999)

Yamamoto, A.：“估计重力异常的最佳减少密度：理论概述”J.Fac.Sci.，北海道大学.. 11，第 3 期。

萩原幸男: "震源断層構造のウォルシュ解析"測地学会誌. 44巻・第1号. 33-36 (1998)

Yukio Hagiwara：“震源断层结构的沃尔什分析”，大地测量学会杂志，第 44 卷，第 1. 33-36 期（1998 年）。

Yamamoto, A., M.Saito, Y.Fukao and M.Kono: "Bouguer anomaly and 3-D crustal structure of the Peruvian Andes"J.Gephys.Res.. Vol.106, (submitted). (2001)

Yamamoto, A.、M.Saito、Y.Fukao 和 M.Kono：“秘鲁安第斯山脉的布格异常和 3-D 地壳结构”J.Gephys.Res.. Vol.106，（已提交）。

Hagita, N., M.Adachi, and R.Shichi: "Subsurface structure of the Yoro fault in central Japan as inferred from gravity anomaly"Bull.Nagoya University Museum. No.16. (2001)

Hagita, N.、M.Adachi 和 R.Shichi：“根据重力异常推断日本中部养老断层的地下结构”Bull，名古屋大学博物馆。

Fukao, Y., M.Kono, A.Yamamoto, M.Saito, K.Nawa and C.Perales: "Gravity Measurements and Data Reduction for Bouguer Anomaly Map of Peru"Bull.Earthquake Res.Inst., Univ.Tokyo. 74. 161-266 (1999)

Fukao, Y.、M.Kono、A.Yamamoto、M.Saito、K.Nawa 和 C.Perales：“秘鲁布格异常地图的重力测量和数据缩减”Bull.Earthquake Res.Inst.，东京大学。