检索规则说明:AND代表“并且”;OR代表“或者”;NOT代表“不包含”;(注意必须大写,运算符两边需空一格)
检 索 范 例 :范例一: (K=图书馆学 OR K=情报学) AND A=范并思 范例二:J=计算机应用与软件 AND (U=C++ OR U=Basic) NOT M=Visual
作 者:王宇玺[1] 宫悦[1] WANG Yuxi;GONG Yue(Sichuan Earthquake Agency,Chengdu 610041,China)
机构地区:[1]四川省地震局,成都610041
出 处:《华南地震》2021年第4期85-90,共6页South China Journal of Seismology
基 金:四川省科技计划项目(2020YJ0475);四川省地震局地震科技专项(LY2001)联合资助。
摘 要:选取了2011年9月至2016年9月地震数据及资料,研究了水库水位与地震时空活动特征,计算了168次M_(L)3.0级以上地震的震源参数。结果显示:区域视应力值随震级的增大而增大,反映了不同震级地震在应力水平积累等方面的差异;视应力有随地震矩增大而增大的趋势,意味着人类活动可能为该区域地震活动的主要因素;拐角频率与震级的关系可分为两段来看,当震级范围为M_(L)3.0~3.5时,拐角频率随震级增大而降低的现象并不明显,当震级范围为M_(L)3.5~4.4时,拐角频率随震级增大而降低,表明震级越大,库区破裂尺度在增大,反应了区域应力积累,应力水平有所增强;视应力时空分布特征显示,视应力随时间变化与频次存在着一定的相关性,且整体视应力水平逐渐增高,且最大地震发生在大坝附近,这些现象都可能为水库蓄水导致区域构造环境发生变化而造成。This paper selects the seismic data from September 2011 to September 2016,studies the relationship between reservoir water level and the temporal and spatial characteristics of earthquakes,and calculates the source parameters of 168 earthquakes with M_(L)≥3.0.The results shows:the value of regional apparent stress increases with the increase of magnitude,which reflects the difference of stress level accumulation of earthquakes with different magnitudes;the apparent stress tends to increase with the increase of seismic moment,which means that human activity may be the main factor of seismicity in this area;the relationship between corner frequency and magnitude can be divided into two sections.When the magnitude range is M_(L)3.0-3.5,it is not obvious that the corner frequency decreases with the increase of magnitude.When the magnitude range is M_(L)3.5-4.4,the corner frequency decreases with the increase of magnitude,which indicates that the larger the earthquake magnitude is,the larger the fracture scale is,reflecting that the regional stress accumulation and the stress level has increased.The spatial and temporal distribution of apparent stress shows that there is a certain correlation between the variation of apparent stress with time and frequency,and the overall apparent stress level gradually increases,and the largest earthquake occurs near the dam.These phenomena may be caused by the change of regional tectonic environment caused by reservoir impoundment.
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在链接到云南高校图书馆文献保障联盟下载...
云南高校图书馆联盟文献共享服务平台 版权所有©
您的IP:216.73.216.200