GLY-1103 Lecture Notes - Lecture 5: Richter Magnitude Scale, Divergent Boundary, Subduction
Document Summary
Usually only get deep earthquakes at subduction zones. Magnitude- amount of ground motion resulting from an earthquake, measured by a richter scale. Intensity- effect on humans and surface features, measured mercalli scale. Moment magnitude- measure of energy release, correlated to rupture on the fault surface, amount of displacement, and rock strength, for every increase in moment magnitude, ground displacement increases by 10, energy release increases by 50. Hazards- ground motion- cause buildings, freeways, tunnel collapse. Road blocks- 1964$, only in new construction, testing diffi(cid:272)ult, (cid:271)uilding (cid:272)an t (cid:271)e strong to both shear and thrust. Pipeline safety- susceptible, higher risk areas have more precautions. Liquefaction- accentuate earthquake hazards, cause settlement of sediment. Aftershocks- smaller earthquakes after main tremor, accumulation of damage. Certain areas are susceptible to landslides, avoid building infrastructure there. Tsunami- largest was lituya bay in 1958, wave height was 1720 feet. They are only caused by normal and reverse faults, not strike-slip.
