In fact, no correlation with weather has been found. In the last 20 years we have been able to locate more EQs yearly because of the increase in the number of seismograph stations in the world and improved global communications. This increase has help us and other seismological centers to locate many small EQs which were undetected in earlier years. A fault is a thin zone of crushed rock between two blocks of rock, and can be any length, from centimeters to thousands of kilometers. It is a fracture in the crust of the earth along which rocks on one side have moved relative to those on the other side.
Most faults are the result of repeated displacements over a long period of time.
The fault plane of a normal fault dips away from the uplifted crustal block. Faulting occurs in response to extension. The fault plane of a reverse fault dips beneath the uplifted crustal block. Faulting occurs in response to compression. Crustal blocks slide past each other.