EESB18H3 Lecture Notes - Lecture 3: Peak Ground Acceleration, Mercalli Intensity Scale, Richter Magnitude Scale
Document Summary
Earthquakes are the result from rupture of rocks along a fault -> energy released in the form of seismic waves. An earthquake is the sudden motion of a rock body along a fault. A fault is a plane of fracture in the lithosphere, where rock masses can move past each other. A strike-slip fault is one in which the motion is horizontal. A dip-slip fault is where the motion is vertical. Normal fault rocks on the hanging wall drop relative to the rocks on the footwall. Reverse fault the rocks on the hanging wall are uplifted relative to those on the footwall. Strike slip faults can be classified as either right or left stepping laterals. When a strike slip earthquake occurs, additional stresses occur anywhere there is a step (bend). Some steps interfere with motion, others do not. Active faults movement during the past 11,600 years. Potentially active faults movement during the past 2. 6 million years.
