Weekly notes April 20-24th
Weekly notes April 20-24th GEO 101
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This 3 page Class Notes was uploaded by Cassidy Reid on Monday April 27, 2015. The Class Notes belongs to GEO 101 at Washington State University taught by Wilkie in Spring2015. Since its upload, it has received 49 views. For similar materials see Introduction to Geology in Geology at Washington State University.
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Date Created: 04/27/15
Geo notes 1 Eccentricity of orbit earth s path around the sun changes from a circular to elliptical orbit 2 Tilts of the earth s axis of rotation varies from 215 to 24 Climate changes and Ice Ages Other global effects include the circulation of water in the oceans Information about the glacial periods can be derived from fossils in sediment from the ocean oor Isotopic Record of Ice Volume 0 The global ice volume increases during glaciations What does this show There has been many periods of glaciation in Earths past The Earth 5 Glacial History And additional effects of glaciation Changes in sea level 0 Sea level falls during glacial periods 0 Sea level rises during interglacial periods Changes in Landscape The great lakes 0 The channeled scablands Global warming What is the greenhouse affect C02 methane Chapter 8 Earthquakes Earthquakes and Plate Tectonics are linked Earthquakes occur at all boundary types modern and ancient and in some cases within the plates 0 95 of energy from earthquakes affect narrow zones along plate edges 0 Some earthquakes are quite deep subduction zones What causes earthquakes Earthquakes are vibrations of the ground created by sudden release of strain energy accumulating in deformed rocks Where does that strain energy come from It is the accumulation of stress energy stored as the rocks are deformed by tectonic pressure What is an earthquake Faut crack in Earth where slip occurs Earthquake slippage along a fault Earthquake focus fault slip location Epicenter surface location of focus Fault scarp cliff formed from vertical slip on fault Aftershocks smal earthquakes that follow an initial earthquake in same vicinity Foreshocks small earthquakes that sometimes precede a large one by few days Seismic Waves P waves Primary Waves waves expand and contact compressional fastest wave travels through liquid solid gas 5 Waves secondary waves waves movw updown side to side sower than P wave Surfaces Waves Slowest waves travel along surface of the earth 0 Side to side 0 Up and down Measuring Earthquakes Seismograph device thaqt records seismic wave motion Seismogram recording of shaking Recipe for locating an earthquake s epicenter Pwaves fastest amp Swave travel at different speeds so you can use the difference to locate the earthquakes 1 Measure time between P and S wave on seismogram 2 Use traveltime graph to get distance to epicenter need seismograms from at least 3 locations 3 Dram circle on map with radius of that distance 4 Three of more circles shuld intersect at EQ Normal Divergent shallow earthquakes Strikeslip Transform shallow earthquakes Reverse Convergent shallow to deep earthquakes Hotspots shallow earthquakes The ground can amplify the shaking Building on bedrock is best Buiding on land ll is worst Tsunami fast moving seismic sea waves generated by faulting Ground motion displaces sea water above generates wave Effects of Earthquakes Tsunami Landslides o Liquefaction Seiches Ground Shift 0 Fires
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