| Preliminary study on isostatic anomaly and recent tectonic stress field-Taking East China Sea and its eastern marginal seas as an example |
| |
| 作者姓名： | 张赤军 方剑 马宗晋 |
| |
| 作者单位： | InstituteofGeodesyandGeophysics，ChineseAcademyofSciences，InstituteofGeology，ChinaSeismologicalBureau，InstituteofGeology，ChinaSeismologicalBureau Wuhan430077，China，Beijing100029，China，Beijing100029，China |
| |
| 基金项目： | State Natural Science Foundation of China (49874016). |
| |
| 摘 要： | Introduction The research of present-day tectonic stress and the mechanism of strain plays an important role in tectonic physics, because the stress and strain affect the tectonic action on the plate bounda-ries and inside the plates. This action should be reflected in geometric field of deformation and in some geophysical fields such as gravitational, geothermal and seismic field as well, for instance, some researchers have investigated the tectonic movement and tectonic stress field in the E…
|
Preliminary study on isostatic anomaly and recent tectonic stress field--Taking East China Sea and its eastern marginal seas as an example |
| |
| ZHANG Chi-jun FANG Jian MA Zong-jin Institute of Geodesy and Geophysics,Chinese Academy of Sciences,Wuhan ,China Institute of Geology,China Seismological Bureau,Beijing ,China.Preliminary study on isostatic anomaly and recent tectonic stress field-Taking East China Sea and its eastern marginal seas as an example[J].Acta Seismologica Sinica(English Edition),2003,16(1). |
| |
| Authors: | ZHANG Chi-jun FANG Jian MA Zong-jin Institute of Geodesy and Geophysics Chinese Academy of Sciences Wuhan China Institute of Geology China Seismological Bureau Beijing China |
| |
| Institution: | 1. Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China
2. Institute of Geology, China Seismological Bureau, Beijing 100029, China |
| |
| Abstract: | On the basis of the reality of recent tectonic movement and discarding such a viewpoint that the isostatic adjust-ment only results from excessive or insufficient compensation, we have discussed the tectonic stress causing ine-quality and regarded the isostatic anomaly as a load on the earths interior, thus the earths inner stress can be cal-culated. The research results show that in the East China Sea and its eastern marginal seas the change of the verti-cal stress derived from the isostatic gravity anomaly is more marked than that of the horizontal stress. Along the Ryukyu 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, the east westward stress on the oceanic crust sx is negative (while the pressure is positive) but on the continental crust is positive. These facts indicate the effect of compression between plates. |
| |
| Keywords: | isostatic gravity anomaly tectonic stress plate movement |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
