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Geoscience ›› 2017, Vol. 31 ›› Issue (04): 860-868.

• Engineering Geology • Previous Articles     Next Articles

Fault Activity and Characteristics of Earthquake Distribution in the Engineering Area of Bohai Strait Cross-sea Channel

LIU Zhongya1(), PENG Xuanming2(), ZHAO Tiehu1, SUN Jun1   

  1. 1. Qingdao Institute of Marine Geology, Qingdao, Shandong 266071,China
    2. Institute of Geophysical and Geochemical Exploration, CAGS, Langfang, Hebei 065000, China
  • Received:2016-06-03 Revised:2017-06-10 Online:2017-08-10 Published:2017-09-15

Abstract:

Newly collected data of high-resolution seismic sections have been used in the analysis of distribution characteristics and the vertical activity rate of active faults in the engineering area of Bohai Strait Cross-sea Channel. This analysis shows that the average vertical activity rate of NE-NNE trending faults is 0.103 mm/a, and that of NW trending faults is 0.080 mm/a since the Late Pleistocene. The analysis results also show that the vertical activity rate is gradually increasing from south to north in both NE-NNE trending faults and NW trending faults, and the NW trending faults show a significantly trending of gradually increasing from west to east. By comparing with the modern small earthquakes and the historical seismic data, it is found that the earthquake distribution in the study area is inhomogeneous, and the seismicity is weakened with the increase of the distance from the fault, and the activity is strong at the intersection point and the end point of the fault. The elastic rebound theory can be used to explain the distribution characteristics of earthquakes. Additionally, the relationship between the seismic activity and the horizontal displacement velocity of the fault is likely to be closer, and the relationship between the seismic activity and the vertical velocity of the fault needs further studies.

Key words: Bohai Strait, active fault, vertical active rate, earthquake distribution, elastic rebound

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