摘要
对永登５．８ 级地震序列及近１０ 年来永登—兰州地区的小震活动进行了研究，结果表明：永登５．８ 级地震为孤立型，震前近１０ 年震区一直有小震活动，主震是在小震活动经历了一个增多—加剧—平静的过程后才发生的。历史地震活动资料及地质构造表明。
The Yongdeng M\-S 5.8 earthquake sequence and past ten years of microseismicity in the Yongdeng-Lanzhou region is studied.It is found in the research that the Yongdeng M\-S 5.8 earthquake belongs to isolated type,and minor earthquakes usually strike the seismic area in near ten years before the mainshock,and that the mainshock occurred after the microseismicity experienced a process to increase,intensify and quiet.From the data of historical seismicity and geological structure in the Yongdeng area it can be seen that the background of developing moderate earthquakes exists in the Yongdeng area.
出处
《内陆地震》
1998年第4期327-336,共10页
Inland Earthquake
关键词
甘肃
余震序列
小震活动
历史地震资料
中强地震
Gansu\ Aftershock sequence\ Small earthquake activity\ Historical seismological data\ Moderate earthquake
