摘要
分析汶川地震以来,华北地区M≥4.0中等地震的时间序列、空间分布特征,以及华北应力水平在汶川M8.0地震、东日本MW9.0地震前后的变化过程。结果显示,汶川地震对华北的影响基本止于华北西部的汾渭地震带,影响最大的时间段为2010年;东日本MW9.0地震对河北平原地震带及以东地区的地震活动影响大,特别是距离板块边界越近,影响越大,影响最大的时间段为2013年;华北地区的中等以上地震活动与周边较大尺度的构造运动具有一定关系;华北周边发生大地震,但并没有引起强震发生,可能与华北处于第四地震活动期的平静幕、应力水平低有重要关系。
In this study, we analyze the time series and special distribution characteristic of the moderate M≥4. Oearthquakes in north China since the Wenchuan M8. 0 earthquake, and then study the stress change process of the north China before and after the Wenchuan M8. 0 earthquake and the Japan Mw9. 0 earth-quake. The result show that the impact of the Wenchuan earthquake on north China is not exceeding Fen- Wei seismic belt, the most significant period is the year of 2010. The Japan Mw9. 0 earthquake mainly af-fected the seismic activity of the Hebei plain seismic belt and the east of the region, in particular, the clos-er to the plate boundary, the greater the impact is , the most significant period is the year of 2013. Moder-ate seismicity in north China and its surrounding larger scale structural movement has a certain relation-ship. Great earthquake occurred in the surrounding of the north China but did not lead to strong earth-quake in the area may due to the low level of stress field of the area and the area being in a quiet episode of the fourth earthquake activity period.
出处
《华北地震科学》
2017年第3期56-60,72,共6页
North China Earthquake Sciences
基金
河北省地震星火科技项目"张渤地震构造带应力状态与强震危险性研究"(DZ201603300011)
2017年地震科技星火计划攻关项目(XH17007)
2017年河北省科技支撑计划项目(15275402D)
2017年河北省地震局地震科技星火重点项目(DZ20170109002)
关键词
太平洋板块
青藏块体
华北地区
应力水平
中等地震
pacific plate
the Qinghai-tibet block
north China
stress filed
moderate earthquakes
