南北地震带地震活动特征  

Study on the seismic distribution and migration law of North-South seismic belt in China

作　　者：况春利 唐新功[1] 于恒达 杨士达 胡家文 任子钧 Kuang Chunli;Tang Xingong;Yu Hengda;Yang Shida;Hu Jiawen;Ren Zijun(School of Geophysics and Oil Resources,Yangtze University,Wuhan 430100,China)

机构地区：[1]"油气资源与勘探技术"教育部重点实验室(长江大学)

出　　处：《国际地震动态》2019年第7期2-8,共7页Recent Developments in World Seismology

基　　金：国家自然科学基金项目(41874119,41674107,41574064);国家重点研发计划(2017YFB0202904)共同资助

摘　　要：采用数理统计方法探讨了780 BC至今、100°-110°E、22°-35°N(中国南北地震带)区域的中国大陆5.0级及以上天然地震的分布规律。通过GMT软件绘制了南北地震带上地震震中和断裂分布图像,分析了南北地震带地震时空分布与地震活动性的规律。研究表明,该地区的大震与强震几乎全部发生在断裂带上,地震频次高、震中密集,呈现集群性等特征,地震活动性较高。该地震带中、南段相似,与北段存在显著差异。在南北地震带上,地震的活跃幕与平静幕持续时间,与活跃幕强度有关。研究结果对于了解地震的时空分布特征,认识中国南北地震带的发震规律,地震的孕震发震和地震活动周期有参考意义。In this paper,the distribution law of natural earthquakes from 780 BC to the present with magnitude of MS5 and larger at region of longitude 22°-35° and latitude of 100° to 110°(China’s north and south seismic belt) was discussed by means of mathematical statistics. The whole transfer image of strong earthquakes in this area is plotted by GMT software,and the regularity of seismicity in north-south seismic belt is analyzed. The study shows that the large and strong earthquakes in this area all occurred on the fault zone,with high earthquake frequency,dense epicenter,clustered characteristics,and high seismic activity. The south-central segment of the seismic zone is similar,with significant differences from the northern segment. In the north-south seismic belt,the duration of the active and calm events of the earthquake is related to the intensity of the active curtain. The results provide a meaningful reference to understand the characteristics of the temporal and spatial distribution of earthquakes,the seismogenic laws of China’s north and south seismic belt,and the seismogenic and earthquake-producing periods of earthquakes.

关 键 词：地震 南北地震带 地震活动周期 

分 类 号：P315.5[天文地球—地震学]