鄂尔多斯块体周缘最小完备性震级测定及b值时空分布特征研究

科学评估Mc是开展地震活动水平、地震发生率和地震危险性分析的重要基础。该文利用鄂尔多斯块体周缘区域的地震目录和基于Gutenberg-Richter(G-R)公式的多种统计地震学方法,寻找测定该区域最小完备震级Mc的最优方法。研究区域的整体完备性震级M_(c)=1.2、b值=0.6+/-0.00。鄂尔多斯周缘的完备性震级随时间变化明显,整体上自2008年以后,完备性震级逐年减小,说明地震台网的逐年加密,加强地震监测能力。

Scientific evaluation of Mc is an important foundation for conducting seismic activity level,earthquake occurrence rate,and seismic hazard analysis.This paper uses the seismic catalog of the surrounding area of the Ordos block and various statistical seismological methods based on the Gutenberg Richter(G-R)formula to find the optimal method for determining the minimum complete magnitude of the region.The overall completeness magnitude of the study area is M_(c)=1.2,with a b-value of 0.6+/-0.00.The complete magnitude around Ordos changes obviously with time,and on the whole,the complete magnitude has decreased year by year since 2008,indicating that the seismic network has been encrypted year by year and the earthquake monitoring capability has been strengthened.