1605年发生于海南岛北部的琼州大地震,震中烈度Ⅺ,震级7~3/_4—8级。极震区强烈下陷,大片陆地沉没为海。极震区长轴方向为北东东,东端向东南偏转为南南东向。该地震是在主压应力轴约为北西300°方向的水平应力场作用下,发生于强烈上升与强烈下降的现代地垒与地堑的边缘转折地带。发震断裂可能为一对X型的北东东向和北北西(以前者为主)的高角度平推正断层。 In 1605, a large Qiongzhou earthquake occurred in the northern part of Hainan Island. The epicenter intensity Ⅺ, magnitude 7 ~ 3 / _4-8. Severe earthquake subsidence, a large land submerged for the sea. The direction of the long axis of the extreme earthquakes is north east and the east is southeast to south-east. The earthquake is a transitional zone at the edge of the modern basement and graben that occurs when the principal compressive stress axis is about 300 ° northwest of the horizontal stress field and occurs strongly upwards and downwards drastically. The seismogenic fault may be a pair of X-shaped NE strike and NNW (formerly predominant) high-angle thrust normal fault.