沉降带这种展布格局可能是盆地内北北东向断裂在北东向挤压、南东向拉伸构造应力场作用下发生顺扭正断所致

• This extension framework of subsidence zones may be resulted from the consequent torsion ordinary faulting of NNE fracture under the action of tectonic stress field(NE compression and SE stretch) in the basin.