摘要
通过分析研究青海省航磁资料得出:区域磁场可划分为四大条块;存在四条北西西向一级深大断裂带,它们处于相对稳定状态;存在七条北北东—南北向走滑性控震带;矩形构造单元体角区易发震;弧形构造单元体(0.3—0.5)Δт内中弧区易发地震;地震与磁性基底起伏有很大的关系。根据上述结论,建立了航磁资料地震危险性评价指标。指出青海省较为具体的地震危险区段。
The following results have been obtained through studing aeromagnetic anomalies in Qinghai province: (1)The regional magnetic fields can be devided into four belts. (2)There are four first class deep faults in NWW direction, which are relatively stable now. (3)There are seven earthquake-controlling faults with slip behavior in NNE and NS directions. (4)Earthquake may happen easily in corner regions of rectangular tectonic unit,and in the top area of arcuate structure unit. (5)There may be close relation between magnetic basement characters and earthquakes. According to above conclusions, the evaluation index of seismic zoning are set up based on aeromagnetic data and the possible regions where earthquake would occur are proposed.
出处
《内陆地震》
1992年第1期79-88,共10页
Inland Earthquake
关键词
青海
深部构造
航磁异常
地震
分布
Qinghai Deep structure Aeromagnetic data Seismic risk area
