| 由多个小震推断的青甘和川滇地区地壳应力场的方向特征 |
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| 引用本文： | 许忠淮,汪素云,黄雨蕊,高阿甲,金小锋,常向东.由多个小震推断的青甘和川滇地区地壳应力场的方向特征[J].地球物理学报,1987,30(5):476-486. |
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| 作者姓名： | 许忠淮 汪素云 黄雨蕊 高阿甲 金小锋 常向东 |
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| 作者单位： | 国家地震局地球物理研究所, 北京 |
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| 摘 要： | 本文根据1975-1984年期间发生的多个小地震的P波初动方向数据,推断了青、甘、川、滇地区平均主应力轴的方向。结果表明,该地区压应力轴（P轴）和张应力轴（T轴）方向皆水平,但其方位由北到南呈现规则转动的趋势,即主压应力轴在北部青甘地区大致取NE-SW方向,到中部川西北地区转为近E-W方向,再到南部云南地区转为NNW-SSE或近N-S方向。形成应力轴方向这样特定分布图象的原因,可用印度板块向北对青藏高原的推挤和缅甸中源地震带地区下沉物质对云南地区的拖曳作用来解释。
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| 关 键 词： | 应力场 小震 青甘川滇地区 |
| 收稿时间： | 1986-01-29 |
DIRECTIONS OF MEAN STRESS AXES IN SOUTHWESTERN CHINA DEDUCED FROM MICROEARTHQUAKE DATA |
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| XU ZHONG-HUAI WANG SU-YUN HUANG YU-RUI GAO A-JIA JIN XIAO-FENGCHANG XIANG-DONG.DIRECTIONS OF MEAN STRESS AXES IN SOUTHWESTERN CHINA DEDUCED FROM MICROEARTHQUAKE DATA[J].Chinese Journal of Geophysics,1987,30(5):476-486. |
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| Authors: | XU ZHONG-HUAI WANG SU-YUN HUANG YU-RUI GAO A-JIA JIN XIAO-FENGCHANG XIANG-DONG |
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| Institution: | Institute of Geophysics, State Seismological Bureau, Beijing |
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| Abstract: | The orientations of the mean principal stress axes in eastern part of Qing-Zang plateau and Yunnan area are deduced from first P-wave polarity readings of microearthquakes, which occurred in this region during the period of 1975 to 1984. The result indicates that, while both P (compressional) and T (tensional) axes are horizontal, their azimuths show a tendency of rather regular rotation from a NE-SW compression in the north, then E-W in the middle part, to a NNW-SSE or nearly N-S compression in the southern part. This pattern of stress axis directions may be attributed to the joint action of the northward push of the India plate to the Qing-Zang plateau and the southwestward pull of the sinking material in the Burma intermediate-depth seismic zone to the Yunnan area. |
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| Keywords: | Stress Microearthquake Southwestern China |
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