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

本项目旨在揭示千岛岛与东北弧交界处的地壳运动特征，了解北海道与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重复运动的区域GPS观测网，并在东北地区进行了连续测量。对大气路径延迟的校正也进行了研究。在北海道建立了基线长度为100 ~ 300 km的区域GPS网。还建立了地震和火山喷发预报研究局地网络。对区域网络进行了GPS测量的重复运动，获得了小于0.3ppm的短期重复性。区域网络探测到与1993年北海道南sei- oki地震有关的地壳变形。在地震发生后安装的2个新地点进行的现场记录的连续测量显示了地震后的变形。利用在东北地区建立的监测网进行连续测量。结果表明，连续GPS阵列能够以较高的临时分辨率检测到基线的变化，并能有效地获取板内变形。提出了一种基于数值预报资料的大气路径延迟校正新方法。研究表明，GPS网获取的可观测水汽和温度数据集有助于提高数值预报模式的精度。通过估算大气路径延迟，将数值预报与GPS气象学相结合。

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.