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EAPS 116: Week 7-8 Notes

by: Zach Weinkauf

EAPS 116: Week 7-8 Notes EAPS 116

Marketplace > Purdue University > Earth Sciences > EAPS 116 > EAPS 116 Week 7 8 Notes
Zach Weinkauf

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About this Document

These notes cover material from week 7 and one lecture of week 8 due to exam.
Earthquake and Volcanos
Julie Elliot
Class Notes
Earthquakes, volcanoes
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This 2 page Class Notes was uploaded by Zach Weinkauf on Sunday March 6, 2016. The Class Notes belongs to EAPS 116 at Purdue University taught by Julie Elliot in Spring 2016. Since its upload, it has received 18 views. For similar materials see Earthquake and Volcanos in Earth Sciences at Purdue University.


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Date Created: 03/06/16
Lecture 13: February 23, 2016 Intraplate earthquakes may be linked to:  Glacial Isostatic Adjustment  Sediment Erosion  Human Activity Earthquakes linked to hydraulic fracturing by caused by changes in pore pressure. Intraplate earthquakes may preferentially occur along weak zones such as former fault zones. 1964 Alaska Earthquake  Uplift measurement in 1964 included measurements of: o Dead algae o Uplifted shorelines o Changes in human structures  Secondary Effects Included: o Extensive liquefaction o Landslides o Tsunamis  Tectonic – Pacific-wide  Local – from landslides  Secondary Effects caused more damage than ground shaking, partially because most of the buildings were built of wood.  Much of the damage caused by local tsunamis that were generated by landslides in fjords.  Local Tsunamis arrived before shaking from the earthquake ended.  Most of the collapsed building in Anchorage were caused by: o Liquefaction induced landslides.  The 1964 earthquake contributed to our understanding of plate tectonics because aftershocks showed that the earthquake occurred on a gently dipping fault. Lecture 14: February 25, 2016 Complicated Strike-Slip Earthquakes – don’t have to be on a plate boundary.  Ex. Canterbury and Darfield 2010-11 Canterbury Earthquakes  A contributing factor to the damage caused by the 2010 Canterbury earthquake was the: o Underlying geology of the Canterbury Plains.  The buildings sustained heavy damage because: o Many were built of unreinforced brick or stone.  What contributed to the number of deaths during the earthquake? o Time and day earthquake occurred. o Ground shaking was more intense than during previous earthquake. o Buildings weakened by previous earthquakes were more likely to collapse. Lecture 15: March 1, 2016 1700 Cascadia Earthquake  Found by looking at: o Subduction Zone o Brian Atwater o Ghost Forest o Tsunami Evidence o Ground Shaking  Why did scientists start looking for clues to past earthquakes along the coast? o They wanted to look for similar features that occurred during the 1964 earthquake.  Why wasn’t there a definite answer to how big and when earthquake was? o The error bars for dates on when trees and vegetation died spanned decades. o The error bars where too large they didn’t know if margin all went at once or in levels.  Why were Japanese Officials puzzled by waves that arrived January 1700? o They were not preceded by an earthquake.  How was it determined that the Cascadia generated the 1700 tsunami in Japan? o The tsunami in Japan did not leave earthquake of right size. o Dating tree roots in Cascadia showed killed between late 1699 and spring 1700.


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