东北地震区小震资料完整性分析及其对地震活动性参数的影响研究

Analysis on integrity of small earthquake data and its influence on seismicity parameters in the northeast seismic zone

以东北地震区为例,基于G-R关系的震级-频度分布原理,研究了东北地震区最小完整性震级MC的时间分布特征和各时段的空间分布特征,统计了研究区内的地震活动性参数,探讨了小震资料完整性分析对地震活动性参数和地震危险性计算结果的影响。研究表明,对区域小震资料进行完整性分析,可以在低水平地震活动地区获得较准确的地震活动性参数,更好地反映了该区未来的地震活动趋势。本文的研究方法和结论可供地震资料完整性分析和地震活动性分析时参考。

The paper takes the northeast seismic zone as an example and analyzes the completeness of the small earthquake catalogues in terms of the Gutenberg-Richter magnitude- frequency relation. The magnitude lower limit is determined in different periods and in different areas by using the quantitative analysis methods. In addition, b value and average annual incidence of earthquake in northeast seismic region are obtained with the use of mathematical statistics method. The effects of the integrated data on the seismicity parameters and seismic hazard analysis are also discussed. It is shown that the completeness analysis provides a possible means for obtaining more accurate seismicity parameter and shows better performance in representing actual regional seismicity level for areas of low seismicity. The researching methods of this article and its conclusion can be used as analysis on integrity of earthquake data and seismic activity research reference.