The intersection regions of the penglai - weihai fault zone with ne striking fault zones are considered to be the likely places for the future medium to strong earthquakes 蓬莱威海断裂带与北东向断裂交汇区是中强地震发生的有利部位。
2.
The results indicate : ( 1 ) the distribution of magmatic rocks shows the feature that in the middle and western part of the study area basic igneous rocks dominate , and in the middle - eastern part intermediate rocks are predominant , while in the southeastern part acid ones are developed . ( 2 ) in the area west to the shiwandashan basin , intermediate magmatites were controlled by deep ne - striking and nw - striking faults , especially at the conjunction site of these two group faults , magmatic activity was strong ; and its tectonic background can be attributed to extensional continental rift 其中，在十万大山盆地以西地区的偏基性岩浆活动受北东和北西向深断裂控制明显，尤其以此两组断裂交汇处的岩浆活动强烈，盆地构造背景属大陆伸展裂谷环境；在十万大山盆地以东地区为偏酸性岩浆活动，主要受东吴运动形成的钦防造山带的控制，属大陆边缘造山带或岛弧造山带环境。
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