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地质力学按照断裂结构面的力学性质,将它们分为压性、张性、扭性、压扭性、张扭性几类。地质力学也不排斥按照断裂两盘相对位移的几何关系将之分为正的、逆的、平移的等等,断裂的力学性质与位移方式两者之间,既有某种依赖关系,又並非简单的对应关系。许多正断层是属于张性断裂,这种张性正断层的形成机理,人们早就熟悉,本文不拟论述。值得注意的是,还有不少正断层,其力学性质並非张性,而属扭性、压性或兼具几种不同性质,我们统称之为“非张性正断层”。
Geomechanics in accordance with the mechanical properties of the fracture surface, they are divided into pressure, tension, torsion, compression and torsion, tension and torsion of several categories. Geomechanics does not exclude the relationship between the two plates according to the fracture geometry of the relative displacement will be divided into positive, inverse, translation, etc., between the fracture mechanics and the displacement of both, both a dependency, not Simple correspondence. Many normal faults belong to Zhang-Zhang fault. The formation mechanism of this Zhang-Zheng normal fault has long been familiar to people and is not discussed in this paper. It is worth noting that there are a lot of normal faults whose mechanical properties are not tensile, but are torsional, compressive or both. We call them “non-tension normal faults”.