Establishment of archeomagnetic secular variation curve in pre-historic age

史前时代古地磁长期变化曲线的建立

基本信息

批准号：
10680173
负责人：
HIROOKA Kimio
金额：
$ 1.92万
依托单位：
Toyama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10680173/
关键词：
Archeomagnetism geomagnetic secular variation Pre-historic time Jomon period Yayoi period Kofun period Southwest Japan Korea 熱残留磁化交流消磁古代

项目摘要

As the accumuliation of archeomagnetic data, precise archeomagnetic secular variation curves of the Hokuriku and Tokai Districts are established for the historic age. On the contrary, for the Japanese pre-historic age before Kofun Period, we have very insufficient amount of archeomaghetic data to trace back the variation of the geomagnetic field precisely.The main aim of the present research project is to collect archeomagnetic data of pre-historic age as many as possible. Another fact, which makes difficult in establishing the pre-historic secular variation curve, is the regional anomaly of the geomagnetic field in and around Japanese Islands. Archeomagnetic data, therefore, should be obtained from sites of widely spreading all over the islands and the vicinity.To cover the wide area and long period, archeomagnetic data are obtained from Aomori prefecture (Sannaimaruyama Site, Shinmachino Site) , Tochigi prefecture (Shitomaki Site) , Shizuoka prefecture (Surugayama Site), Toyama prefecture (Hanakiri Site), and Korea (Chunshan-dong Site, Wau-ri Site, Dujeong-dong Site, Daepyeong-ri Site, Paldal-dong Site, , Neuk-do Site). Ages of those sites are ranging from Jomon Period to Early Kofun Period.As the results of above-mentioned sampling and measurements, the outline of archeo-secular variation in Korea is obtained for the period from the 2nd century to 18th century A.D. The most conspicuous aspect obtained from this study is that the Korean geomagnetic declination between the 2nd and 4th century deviates more than 10 degree eastward as compared with that of Japanese one of same age. The regional gradient of the geomagnetic -field at the time seems to be much grater than that of the present.

随着考古磁数据的积累，Hokuriku和Tokai地区的精确考古磁性世俗变化曲线是为历史时代建立的。相反，对于Kofun时期之前的日本史前时代，我们的考古积极数据数量不足以准确追溯地磁领域的变化。本研究项目的主要目的是收集尽可能多的赫斯特里之前的考古磁数据。在建立史前世俗变化曲线方面很难的另一个事实是日本群岛及其周围地磁领域的区域异常。因此，应从群岛和附近广泛传播的地点获得考古磁数据。要涵盖较大范围和长时间，考古磁数据是从Aomori县（Sannaimaruyama Site，Shinmachino Site，Shinmachino Site），Tochigi Prefector（Shitomaki site），Shizuoka Prectun（Shizuoka prectun）（Shizuoka prectun），shizuoka prectuniane prectunion（shizuoka prectun）（Hanakiri站点）和韩国（尚山顿站地点，Wau-Ri站点，Dujeong-Dong站点，Daepyeong-Ri站点，Neuk-do-do站点，帕尔达尔 - 北站地点）。这些站点的年龄范围从乔蒙（Jomon）期到库福（Kofun）早期。随着上述取样和测量结果的结果，从公元2世纪到18世纪，韩国的考古密度变化的概述是获得了公元2世纪至18世纪的最明显方面，这是从这项研究中获得的，这是10个程度的偏离，而不是伊斯兰教范围的差异，而与2n相比，与2n相比，2n easter deprient and 4 Conereant and Becoratient and 4 Conereant and Becoratient and Bequomagnity and Becomagnectiat and 2n。日本同龄人的年龄。当时的地磁 - 磁场的区域梯度似乎比目前的刨丝器要多得多。