The present direction of the principle horizontal stress is NWW-SEE in the north of Zhuanghai area, while the direction is NEE-SWW in the south area.

• 桩海北部地区现今最大水平主应力的方向为北西西-南东东向，桩海南部地区现今最大水平主应力的方向为北东东-南西西向。