邢台地震区浅部构造特征及其与深部构造的耦合关系
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摘要
根据邢台7-2 级和6-8 级地震震中区的浅层和超浅层地震勘探结果,查明了震中区浅部铲形断裂的性质及活动年代,认为新河断裂(F1) 自晚更新世以来已不再活动,它不是发震断裂。另外,结合该区深地震反射剖面和深地震测深剖面结果,讨论了震中区的深浅部构造形态及它们的相互关系,从而确定了发震断裂应为震源之下的高倾角超壳断裂①。邢台地震的发生是由于地幔岩浆的上侵作用产生附加应力场,并与区域构造应力场共同作用使该断裂重新活动,引发了邢台地震,并引起浅部断层及地表物质的运动。
The property and active age of the shallow listric faults in the epicentral areas are detected by the results of shallow and ultrashallow seismic prospecting in the epicentres of Xingtai M s7 2 earthquake and M s6 8 earthquake. It is suggested that the Xinhe fault(F 1) has not moved since Late Pleistocene epoch and the fault is not the earthquake generating fault. In addition, the paper discusses the deep and shallow construction patterns and their relation and it is affirmed that the earthquake generating faults are the high dip faults beneath the focus of the earthquakes in the light of the results of deep seismic reflection profiles and deep seismic sounding profiles in Xingtai area. The invading function of upper mantle magma produces additional stress field. Common effect of the additional stress field and regional tectonic stress field caused again the high dip fault action and the action caused Xingtai earthquakes. The earthquakes caused the motion of the shallow fault and surface material.
The property and active age of the shallow listric faults in the epicentral areas are detected by the results of shallow and ultrashallow seismic prospecting in the epicentres of Xingtai M s7 2 earthquake and M s6 8 earthquake. It is suggested that the Xinhe fault(F 1) has not moved since Late Pleistocene epoch and the fault is not the earthquake generating fault. In addition, the paper discusses the deep and shallow construction patterns and their relation and it is affirmed that the earthquake generating faults are the high dip faults beneath the focus of the earthquakes in the light of the results of deep seismic reflection profiles and deep seismic sounding profiles in Xingtai area. The invading function of upper mantle magma produces additional stress field. Common effect of the additional stress field and regional tectonic stress field caused again the high dip fault action and the action caused Xingtai earthquakes. The earthquakes caused the motion of the shallow fault and surface material.
引文
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祝治平,张先康,盖玉杰,等.1995. 邢台地震区及相邻地区地壳上地幔速度结构研究. 地震学报,17(3) :328 ～334.
王椿镛,王贵美,林中洋,等.1993. 用深地震反射方法研究邢台地震区地壳细结构. 地球物理学报,36(4):445～452 .
王椿镛,张先康,赵静娴,等.1994 . 邢台地震区地壳细结构研究及对地震构造的新认识. 见:陈运泰等主编. 中国固体地球物理学进展. 北京:海洋出版社.31 ～40 .
徐杰,洪汉净,赵国泽.1985 . 华北平原新生代裂谷盆地的演化及运动学特征. 现代地壳运动研究(1) . 北京:地震出版社.
徐杰,方仲景,杨理华.1988 .1966 年邢台7-2 级地震的构造背景和发震构造,地震地质,10(4) :51 ～59 .
祝治平,张先康,盖玉杰,等.1995. 邢台地震区及相邻地区地壳上地幔速度结构研究. 地震学报,17(3) :328 ～334.
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