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| An analysis on short—wave components of the global stress field | |
| 引用本文： | 黄玺瑛,魏东平,陈棋福,陈虹.An analysis on short—wave components of the global stress field[J].地震学报(英文版),2003,16(1):42-49. |
| 作者姓名： | 黄玺瑛 魏东平 陈棋福 陈虹 |
| 作者单位： | DepartmentofGeosciences，GraduateSchoolofChineseAcademyofSciences，DepartmentofGeosciences，GraduateSchoolofChineseAcademyofSciences，CenterforAnalysisandPrediction，ChinaSeismologicalBureau，InstituteofCrustalDynamics，ChinaSeismologicalBureau Beijing100039，China，InstituteofCrustalDynamics，ChinaSeismologicalBureau Beijing100085，China，Beijing100039，China，Beijing100036，China，Beijing100085，China |
| 基金项目： | MOST contract of 2001BA601B02 and State Natural Science Foundation of China (49804006). |
| 摘 要： | Introduction The intraplate stresses are affected by two types of forces: one is called the first-order stresses (Zoback, 1992) or the long-wave components of stresses, which are closely related to the driving mechanism of the plate motions such as ridge push, continental collision resistance, slab pull (suc-tion) and mantle drag force (Richardson, 1992; WEI, 2000). This type of stress field is character-ized by a uniform feature in very large horizontal scale with 50 times or more of the th… |
| 关 键 词： | 全球应力场 短波分量分析 世界应力图 构造运动 地震 板块运动 |
An analysis on short-wave components of the global stress field |
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| HUANG Xi-ying, WEI Dong-ping CHEN Qi-fu CHEN Hong.An analysis on short-wave components of the global stress field[J].Acta Seismologica Sinica(English Edition),2003,16(1):42-49. | |
| Authors: | HUANG Xi-ying WEI Dong-ping CHEN Qi-fu CHEN Hong |
| Institution: | 1. Department of Geosciences, Graduate School of Chinese Academy of Sciences, Beijing 100039, China;Institute of Crustal Dynamics, China Seismological Bureau, Beijing 100085, China 2. Department of Geosciences, Graduate School of Chinese Academy of Sciences, Beijing 100039, China 3. Center for Analysis and Prediction, China Seismological Bureau, Beijing 100036, China 4. Institute of Crustal Dynamics, China Seismological Bureau, Beijing 100085, China |
| Abstract: | The 10 920 stress indicators collected so far by the WSM (World Stress Map) project represent the observed ori-entations of the maximum horizontal principal stress (sHmax) in a certain region. Assuming that the long-wave component of sHmax is expressed by the absolute direction of plate motions, we can get the relative orientation and the magnitude of the short-wave component resulted from the local tectonic process or other factors with vector analytical technique. The global surface was divided into basic element bins by 2.52.5 dimensions and the WSM indicators were statistically analyzed for each element by weight coefficient method in order to determine the mean orientation of the stress. We calculated the long-wave component of the global stress field using HS2-NUVEL1 model. The relative magnitude or the direction limitation of short-wave component, which reflect the local contribution to the observed stresses, was determined by the angle between the mean sHmax and the orien-tation of the long-wave component. The results of this paper show that the contribution of either the long-wave component or the short-wave component is approximately equal to most of the global plates on the basis of the mean effect of the observed stresses. For some of continental regions, the local active tectonics plays an important role in the observed stresses and controls the generation and occurrence of earthquakes. |
| Keywords: | stress field Euler vector short-wave component |
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