权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Study of great earthquakes by means of satellite altimetry and Synthetic aperture radar.

利用卫星测高和合成孔径雷达研究大地震。

基本信息

批准号：
10440126
负责人：
OKUBO Shuhei
金额：
$ 7.23万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10440126/
关键词：
Geoid Fault motion Viscoelasticity Satellite Altimetry Synthetic Aperture Radar 人工衛星

项目摘要

1. We carried out a research to eliminate the meteorological disturbance on the differential interferometry of SAR data by using a JMA regional numerical model. The technique enables us to detect long wavelength undulated fringes at western coast of Korean Peninsula by ERS-1 satellite radar interferometry. Though the amplitude in the derived interferogram is larger than that of prediction, the spatial pattern is similar to the theoretical computation of inland flexural response to the ocean tide in the Yellow Sea.2. We developed a recipe to compute gravity/geoid height change and vertical displacement caused by a point dislocation in a spherical, viscoelastic and self-gravitating earth. It enables us to trace the crustal deformation excited by a great earthquake. Time evolutions for a point source located in the elastic lithosphere is distinctively different from that when a source is in the viscoelastic asthenosphere.3. As a first step toward a numerical modeling of global internal tide field, the distribution of the M2 internal tide in the North Pacific is examined using a three-dimensional primitive equation numerical model. The numerical simulation shows that energetic internal tides are generated over the prominent bottom topographies in the Indonesian Archipelago, the Solomon Archipelago, the Aleutian Archipelago as well as over the continental shelf slope in the East China Sea, the Izu-Ogasawara Ridge and the Hawaiian Ridge. In particular, the calculated spatial distribution of the M2 internal tide around the Hawaiian Ridge agrees very well with that obtained from the Topex/Poseidon altimetry.

1.利用日本气象厅（JMA）区域数值模式，对SAR差分干涉测量中气象干扰的消除进行了研究。该技术使我们能够检测长波长波动条纹在朝鲜半岛西部海岸的ERS-1卫星雷达干涉测量半岛。虽然推导出的干涉图的振幅比预测值大，但空间模式与黄海内陆弯曲响应的理论计算结果相似.我们开发了一个配方来计算重力/大地水准面高度变化和垂直位移所造成的一个点位错在一个球形，粘弹性和自引力地球。它使我们能够追踪大地震激发的地壳形变。弹性岩石圈中点源的时间演化与粘弹性软流圈点源的时间演化有明显的不同.作为数值模拟全球内潮场的第一步，本文用三维原始方程数值模式研究了北太平洋M2内潮的分布。数值模拟结果表明，在印度尼西亚群岛、所罗门群岛、阿留申群岛的显著海底地形以及东海大陆架斜坡、伊豆-小笠原海岭和夏威夷海岭，均产生了高能内潮。特别是，计算的夏威夷海岭周围的M2内潮的空间分布与Topex/Poseidon测高得到的结果非常吻合。