Earthquake occur because of tectonic stress action from the interior of earth, rock suddenly rupture and slip.
地震是由于地球内部的岩体受到构造应力作用，导致岩体突然断裂错动的结果。
For basins under the action of different tectonic forces, types of stress environment, their distribution and the genetic mechanics of main structural characters have been studied.
分析了不同性质构造力作用下含油气盆地的地应力类型和分布规律，从机理上说明了各类盆地的构造及断裂特点。
Seimic precursor occurrence is the result from the action of "double force source", namely tectonic stress and the subsurface fluid force.
地震前兆的产生是“双力源”即构造应力和流体力联合作用的结果；
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