由震源机制解推断苏鲁皖豫地区的现代构造应力场 |
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作者单位: | 六省(市)震源机制小组 |
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摘 要: | 根据1973—1979年苏、鲁、皖、豫地区37个中小地震(M=2.1—6.0)震源机制结果的统计分析,得到地震应力场的优势分布:主压应力轴约76°,主张应力轴约344°。表明本区处于北东东向水平压应力和北北西向水平张应力的现代构造应力场作用之中。结合部分中小地震等震线长轴方向及晚第三纪以来断裂走向的优势分布均为北北东向这一特点,推测现今地震破裂具有继承性。最后讨论了本区现代构造应力场与其北部和南部的不同关系
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关 键 词: | 现代构造应力场 震源机制解 应力主轴 苏鲁 地震局 优势方向 等震线 北北东向 地震应力 中小地震 |
STUDY OF RECENT TECTONIC STRESS FIELD IN JIANGSU-SHANDONG-ANHUI-HENAN REGION FROM THE FOCAL MECHANISM SOLUTIONS |
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Abstract: | Based upon the statistical studies of focal mechanism solutions of 37 moderate-small earthquakes (Ms = 2.1-6.0) during the period from 1973 to 1977 in Jiangsu-Shandong-Anhui-Henan region, the preferred principal compressive stress of recent tectonic stress field is in NEE (about 76°)and the tensile stress in NNW (about 344°).Considering that both the long axes of isoseismals for some moderate-small shocks and the Late Tertiary faults are characterized by a NNE trend in predominance, we inferred |
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