What are the names of the 2 basic earthquakes?
Strike-slip earthquakes–occurs on an approximately vertical fault plane as the rock on one side of the fault slide horizontally past the other. Dip-slip earthquake — the fault is at an angle to the surface of the earth and the movement of the rock is up or down. • Q: How do we know a fault exists? A: (1) if the earthquake left surface evidence, such as surface ruptures or fault scarps (cliffs made by earthquakes); (2) if a large earthquake has broken the fault since we began instrumental recordings in 1932; and (3) if the faults produces small earthquakes that we can record with the denser seimographic network established in the 1970s. • Q: What is “surface rupture” in an earthquake? A: Surface rupture occurs when movement on a fault deep within the earth breaks through to the surface. NOT ALL earthquakes result in surface rupture. Fault rupture almost always follows preexisting faults which are zones of weakness. Rupture may occur suddenly during an earthquake or slowly in the form
