| 全球观测应力场的短波分量分析 |
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| 引用本文： | 黄玺瑛,魏东平,陈棋福,陈虹.全球观测应力场的短波分量分析[J].地震学报,2003,25(1):40-46. |
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| 作者姓名： | 黄玺瑛 魏东平 陈棋福 陈虹 |
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| 作者单位： | 1) 中国北京100039中国科学院研究生院地学部
2) 中国北京100036中国地震局分析预报中心
3) 中国北京100085中国地震局地壳应力研究所 |
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| 基金项目： | 国家“十五”科技攻关项目(2001BA601B02)，国家自然科学基金(49804006)共同资助. |
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| 摘 要： | 世界应力图(WSM，World Stress Map)计划的应力指标，目前已累积数据共计10 920个，这些应力指标代表了该地区最大水平主应力的实际观测方向；与此同时，可以假定全球各个板块的绝对运动方向表征了相应各板块的最大水平主应力方向的长波分量．根据应力场的叠加原理，得到由该地区局部构造运动等因素贡献的短波分量的相对大小和方向．将全球划分成2.52.5的基本单元，对每个单元的WSM数据进行加权统计分析，得到其平均应力观测取向，利用HS2-NUVEL1全球绝对板块运动模型计算应力场的长波分量；平均观测应力取向和长波分量取向之间的夹角，决定了相应短波分量相对于观测应力场的大小及其取向的范围，并反映了特定研究地区局部应力场对总应力场的贡献程度．本文的计算结果表明，全球板块的绝大部分地区及各板块的平均效果，长波分量与短波分量对观测应力场的贡献程度相当．对于某些大陆板块内部，局部构造活动对观测应力场的贡献起到重要作用，因而控制着地震的孕育与发生．
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| 关 键 词： | 应力场& 欧拉矢量& 短波分量 |
| 文章编号： | 0253-3782(2003)01-0040-07 |
| 修稿时间： | 2002年3月11日 |
AN ANALYSIS ON SHORT-WAVE COMPONENTS OF THE GLOBAL STRESS FIELD |
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| Huang Xiying, Wei Dongping Chen Qifu Chen Hong.AN ANALYSIS ON SHORT-WAVE COMPONENTS OF THE GLOBAL STRESS FIELD[J].Acta Seismologica Sinica,2003,25(1):40-46. |
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| Authors: | Huang Xiying Wei Dongping Chen Qifu Chen Hong |
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| Institution: | Huang Xiying1,2) Wei Dongping1) Chen Qifu3) Chen Hong2) 1) Department of Geosciences,Graduate School of Chinese Academy of Sciences,Beijing 100039,China 2) Institute of Crustal Dynamics,China Seismological Bureau,Beijing 100085,China 3) Center for Analysis and Prediction,China Seismological Bureau,Beijing 100036,China |
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| Abstract: | The 10 920 stress indicators collected so far by the WSM (World Stress Map) project represent the observed orientations 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 orientation 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. |
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| Keywords: | stress field Euler vector short-wave component |
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