The fracture surfaces of the focal mechanisms are selected according to the mass moving orientation of earth deformation field in the Yajiang region in recent period.
根据雅江地区近期大地形变场物质运移方向，选定了震源机制解的破裂面。
Before earthquake occurrence, the crustal deformation causes redistribution of the earth density, so there occur some characteristic changes in the earth gravity field.
地震前，地壳变形引起地球密度重新分布，从而使地球重力场发生某些特征变化。
Variations of gravity field in this area may be caused by the earth crust deformation, quality transition in deep crust and fault creep deformation.
重力变化可能是由该区地壳形变、地壳深部质量迁移和断层蠕动共同作用引起的。
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