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Xu Jie,Gao Zhanwu,Sun Jianbao,Song Changqing
Author NameAffiliation
Xu Jie Institute of Geology, China Seismological Bureau, Beijing 100029, China 
Gao Zhanwu Institute of Geology, China Seismological Bureau, Beijing 100029, China 
Sun Jianbao Institute of Geology, China Seismological Bureau, Beijing 100029, China 
Song Changqing Institute of Geology, China Seismological Bureau, Beijing 100029, China 
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基金项目:国家重点基础研究发展计划(973计划)(95130305)
A Preliminary Study on Geological and Seismogenic Structures in the Region of 1969 M 7.4 Bohai Sea Earthquake
Xu Jie,Gao Zhanwu,Sun Jianbao,Song Changqing
Abstract:
A more detailed and deep-going analysis of tectonic conditions for the 1989 Bohai Sea M 7.4 earthquake area has been made based on the data of oil geological exploration and results of seismological researches. The obtained result fills the gap in seismotectoulc research of Large Bohai Sea earthquake area of North China. The earthquake area is located in the eastern part of Cenozoic rifted basin of the Bohai Gulf, along the intersection zone between the NNE-trend ing Yingkou-Weifang fault zone and the NW-trending Beijing-Penglai fault zone. In the early Tertiary fault-depression stage, three sets of faults, the NNE-, NW-, and W-E-trending faults, were developed in the upper crust in the area. They are listric and planar in the form,of normal fault character and mostly the major faults in faulted depressions. In the fault-de pression stage since late Tertiary, the preexisting faults have undergone movement to different extent. Meanwhile, a new NE-trending Huanghekou (Yellow River Mouth)-Miaoxibei fault zone was developed. The focal faulting of the M 7.4 earthquake, striking to N45°E and dip ping to SE, is nearly vertical, with dextral strike-slip nature, and buried down to depth of 15 ~ 34 km. The seismogenic fault for the large earthquake is not the Yingwei fault, but the new ly generated Huanghekou-Miaoxibei fault.
Key words:  Bohai Gulf basin  Bohai Sea Ms7.4 earthquake  Newly generated fault zone  Lis tric fault