GEOLOGY 105 Quiz: Test Two- Earthquakes

• School: UMASS-Amherst
• Department: Geology
• Course: GEOLOGY 105
• Professor: Clement William

Document Summary

It is important to understand past earthquakes to be able to accurately predict future earthquakes. 1755 lisbon earthquake: quakes or shaking, tsunami or tidal wave, fires, more than 60,000 people were killed. (cid:1005)(cid:1011)(cid:1004)(cid:1004)(cid:859)s- (cid:862)assess that they happe(cid:374)ed(cid:863: john winthrop (1755)- (cid:862)ea(cid:396)th(cid:395)uakes a(cid:396)e (cid:449)a(cid:448)es (cid:449)ithi(cid:374) the ea(cid:396)th, john mitchell (1760)- earthquakes caused by rocks shifting deep within the earth. (cid:1005)(cid:1012)(cid:1004)(cid:1004)(cid:859)s- (cid:862)(cid:449)hy they happe(cid:374)ed(cid:863: robert mallet (1857)- mapped earthquake zones around. Earth: john milne (1891)- founder of seismology. The seismograph: milne invented the predecessor to the modern seismograph and hence the science of seismology. Epicenter- the center of an earthquake: the distance to an earthquake can be calculated from the arrival times of shock waves from different locations. Three is the magic number for this: ea(cid:396)th(cid:395)uake(cid:859)s (cid:373)ust o(cid:272)(cid:272)u(cid:396) o(cid:374) a fault. The mercalli intensity scale- intensity scale based on the following: impressions of people involved, movement of objects, damage to buildings, the intensity is based on a scale of 1 to 12.