the point beyond a critical value called _____ at which rocks fail - that is, they lose cohesion and break into two or more parts. Brittle rock formations commonly fail on faults when they are stressed beyond their ___________
occurs when rocks being stressed suddenly break along a new or preexisting fault. The two blocks of rock on either side of the fault slip suddenly, setting off ground vibrations, seismic waves, that are often destructive.
are the first waves to arrive compressional or push pull waves that travel through the solid rock of the Earth's crust at about 6 km/s, which is about 20 X faster than sound waves travel through air. Compressional waves can travel through solid, liquid, or gaseous materials.