聊城——兰考断裂带及其邻区现代地壳应力场与地震活动

MODERN CRUST STRESS FIELD AND SEISMICITY IN LIAOCHENG—LANKAO FAULT ZONE AND ITS ADJACENT AREA

  • 摘要: 本文利用聊城——兰考断裂带及其邻区25个小地震震源机制结果及近期小地震资料,分析了本区现代地壳应力场以及地震活动的基本特征。发现:本区主压应力轴取向为北东东(近东西)向,主张应力轴为北北西(近南北)向,与华北地区应力场相差甚微,与1937年荷泽7级地震震源应力场极为一致;分区应力主轴取向的稳定性有一定差别;相应的地震活动方式(时间、空间特征等)亦不尽相同。

     

    Abstract: Using the 25 focal mechanism solutions and receft small shocks data in Liaocheag-Lan-kao fault zone and adjacent area,the basic characteristics of the recent crust stress field and seismicity in the region have been analvscd.11 ba been found that the directions of the compressive and tensile principal stress axes in the region are MEE (≈EW) and NNW (≈SN) respectively, basically consistent with that of North China stress field, and quite agree with that of tbe focal stress field of the Heze earthquake in 1973, But there are some difference in stability of direction of the principal stress axes in sub areas and in seismicity (time-space characteristics etc.).

     

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