Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Acta Seismologica Sinica》 2003-01
Add to Favorite Get Latest Update

PRELIMINARY STUDY ON ISOSTATIC ANOMALY AND RECENT TECTONIC STRESS FIELD——TAKING EAST SEA AND ITS EASTERN BOUNDARY SEAS AS EXAMPLE

Zhang Chijun1) Fang Jian1,2) Ma Zongjin2) 1) Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China 2) Institute of Geology, China Seismological Bureau, Beijing 100029, China  
On the basis of the reality of recent tectonic movement and discarding such a viewpoint that the isostatic adjustment only results from excessive or insufficient compensation we have discussed the tectonic stress causing inequality and regard the isostatic anomaly as a load on the earth抯 interior, thus the earth抯 inner stress can be calculated. The research results show that in the East Sea and its eastern boundary seas area the change of the vertical stress derived from the isostatic gravity anomaly is more marked than that of the horizontal stress. Along the trench there is an enhancement of vertical stress by 5 MPa, which evidently reflects the effect of plate subduction. On contrary, along the island arc to the northwest of the trench the vertical stress weakens by about 5 MPa. The horizontal stresses in eastern and western parts are obviously different that the east-westward stress on the oceanic crust xs is negative (while the pressure is positive) but on the continental crust is positive. These facts indicate the effect of compression between plats.
【Fund】: 国家自然科学基金(49874016);; 中国科学院知识创新项目(KZCX2-106);; 地球空间与大地测量教育部实验室共同资助.
【CateGory Index】: P315.72
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved