几件事可以表明,地震发生爆炸,而不是地震。首先,源的深度。往往最浅的地震的震源至少几公里以下的地面和一些地震在世界的某些地方可以去约700公里。人工爆破另一方面,会很浅,震源,本质上是在表面。其次,更重要的是,p波辐射模式(横波)和爆炸是完全不同的地震。这可以调查策划的第一个到达波的极性地震立体图,网上的位置是由源的方位的接收站和即将离任的角波从源。地震辐射纵波在四叶,交替极性。这被称为一对双源和它产生一个断层面的解决方案有两个正面和两个负面象限。爆炸,辐射的纵波资料同样在各个方向产生各向同性模式。你可能看过报告后的第二个地震核试验被解读为隧道崩溃。 This also has a distinctive focal mechanism, called a compensated linear vector dipole (CLVD). [![enter image description here][1]][1] The photo shows directions of first motion at the source (a) (outwards = positive, inwards = negative), the P-wave radiation pattern (b), the steroplot of each focal mechanism (c). These links give some further introduction to how stereonets are used to analyse earthquakes: https://ocw.mit.edu/courses/earth-atmospheric-and-planetary-sciences/12-510-introduction-to-seismology-spring-2010/lecture-notes/lec18.pdf http://www.ucl.ac.uk/EarthSci/people/lidunka/GEOL2014/Geophysics4%20-%20Seismic%20waves/Seismology/Earthquake%20Seismology2.htm http://rses.anu.edu.au/~nick/teachdoc/lecture11.pdf [1]: https://i.stack.imgur.com/O7zXu.jpg