渤海海峡跨海通道工程区断裂活动性及地震分布特征

发布时间：2018-04-20 02:28

本文选题：渤海海峡 + 活动断裂　；参考：《现代地质》2017年04期

【摘要】：利用近年来采集的高分辨率地震剖面资料,编制了渤海海峡跨海通道工程区主要活动断裂分布图,并对其中各断裂的垂直活动速率进行计算,发现渤海海峡跨海通道工程区内NE—NNE向断裂晚更新世以来的平均垂直活动速率为0.103 mm/a,NW向断裂的平均垂直活动速率为0.080 mm/a,其中NE—NNE向断裂和NW向断裂的活动速率呈由南到北逐渐增强的趋势,NW向断裂还表现出明显的自西向东活动速率逐渐增强的特点。另外,通过与现代小震资料和历史地震资料进行对比,发现研究区内地震分布具有不均匀性,地震活动性随着与断裂之间距离的增加而减弱,且在断裂交点和端点处活动性较强。研究区内地震的这些分布特征能够用弹性回跳学说解释。此外,研究区内地震活动性与断裂的水平位移速率关系可能更为密切,其与断裂垂直活动速率的关系还需要进一步研究。
[Abstract]:Based on the high resolution seismic profile data collected in recent years, the main active fault distribution map in the engineering area of the Bohai Strait cross-sea passage is compiled, and the vertical active rate of each fault is calculated. It is found that the average vertical activity rate of the NE-NNE trending faults since the late Pleistocene is 0.103 mm / a and the average vertical activity rate of the NW trending faults is 0.080 mm / a, including the NE-NNE trending faults and the NW-trending faults. The NW fault shows an increasing trend from south to north, and it also shows the characteristic of increasing activity rate from west to east. In addition, by comparing with the modern small earthquake data and historical seismic data, it is found that the seismic distribution in the study area is uneven, and the seismicity decreases with the increase of the distance between the fault and the fault. Moreover, there is strong activity at the intersection and the end of the fault. These distribution characteristics of earthquakes in the study area can be explained by elastic rebound theory. In addition, the relationship between seismic activity and the horizontal displacement rate of faults may be more close, and the relationship between seismic activity and vertical activity rate of faults needs to be further studied.
【作者单位】：国土资源部青岛海洋地质研究所;中国地质科学院地球物理地球化学勘查研究所;
【基金】：中国地质调查局海洋地质保障工程项目“渤海海峡跨海通道地壳稳定性调查评价”(GZH201200504)
【分类号】：P736;P75

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