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A Study on the crustal movement around the junction of the Kurile and the Northeastern arc.

千岛与东北弧交界处地壳运动研究.

基本信息

批准号：
03452054
负责人：
KASAHARA Minoru
金额：
$ 2.37万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

项目摘要

The aim of this project is to reveal the feature of the crustal movement around the junction of the Kurile and the Northeastern arc, and to understand the difference of tectonics between Hokkaido and Northeastern Japan. In order to achieve the purpose, We established a regional GPS observation network for repeated campaign in Hokkaido, and performed the continuous measurements in Tohoku district. The correction of atmospheric path delay is also studied.The regional GPS network of which baseline's length ranges from 100 to 300 km is established in Hokkaido. Some local network for research on prediction of earthquakes and volcanic eruption is also founded. Repeated campaigns of GPS measurements for the regional network are performed, and Short term repeatabilities are obtained less than 0.3ppm. The regional network detected the crustal deformation associated with the 1993 Hokkaido Nansei-Oki earthquake. Continuous measurements with on site recording at 2 new sites installed just after this event reveals post-seismic deformation.The Continuous measurements carried out by using the network established in Tohoku district. It is confirmed that the continuous GPS array allows to detect variation of baseline with high temporary resolution and is effective to obtain the intraplate deformations.A new correction method of atmospheric path delay based on the numerical weather prediction data have been developed. This study reveals that the data set of perceptible water vapor and temperature obtained by the GPS networks are useful to improve the accuracy of numerical prediction model. A new system combined the numerical prediction with the GPS meteorology through the estimation of atmospheric path delay.

该项目的目的是揭示千岛群岛和东北弧交界处的地壳运动特征，并了解北海道和日本东北部的构造差异。为了实现这一目的，我们在北海道建立了区域GPS观测网络以进行重复活动，并在东北地区进行连续测量。对大气路径延迟的修正也进行了研究。北海道建立了基线长度为100～300km的区域GPS网络。还建立了一些地震和火山喷发预测研究的地方网络。对区域网络进行重复的 GPS 测量，短期重复性小于 0.3ppm。该区域网络检测到了与 1993 年北海道 Nansei-Oki 地震相关的地壳变形。在事件发生后不久安装的两个新站点进行的现场记录连续测量揭示了震后变形。利用东北地区建立的网络进行了连续测量。实践证明，连续GPS阵列能够以高临时分辨率探测基线变化，并能有效获取板内形变。提出了一种基于数值天气预报数据的大气路径延迟修正新方法。本研究表明，GPS网络获得的可感知水汽和温度数据集有助于提高数值预测模型的准确性。新系统通过估计大气路径延迟将数值预测与 GPS 气象相结合。