前震旦浅变质岩区
pre-Sinian low-grade metamorphic terrain
震前前兆异常特点
characteristics of precursory anomaly
震旦系灯影组
sinian dengying formation
震旦系－寒武系界线地层对比
the Sinian-Cambrian boundary strata
震旦系-寒系系边界层
Sinian-Cambrian boundary beds
震旦系浅变质岩
Sinian epimetamorphic rocks
震旦系－下古生界
Sinian system-lower Paleozoic
sinian-lower paleozoic
sinian-lower palaeozoic
大震前后
before and after strong earthquakes
地热地震前兆信息
Information of seismo-geothermal precursor