10-22-15 Notes GEOL 1200 - 003
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GEOL 1200 - 003
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This 3 page Class Notes was uploaded by Keely Haggar on Sunday October 25, 2015. The Class Notes belongs to GEOL 1200 - 003 at University of North Carolina - Charlotte taught by Jake Armour in Summer 2015. Since its upload, it has received 10 views. For similar materials see Physical Geology (no lab) in Geology at University of North Carolina - Charlotte.
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Date Created: 10/25/15
Geology 1200 Notes 102215 Chapter 11 gt Isostasy gt Foldingst gt Orogenisis Mountain Building What type of fault is this a Reverse b Syncline c Monocline d Normal Ans a Reverse gt Recognize that this is a cross sectional view footwall has gone down and the hangwall has gone up Resulting of compression Reverse Fault 39 When there are active faults we see evidence at the surface a of the Earth or evidence in the past of them failing Insurance 1quot companies are most interested in the locations of fault zones Like San Andreas Earthquake Prediction 1 Recurrence Interval Talked about on Tuesday 2 Seismic Gaps Area where an active fault has not moved recently overdue to have an earthquake gt Union County 1913 gt Charleston 1886 Where you have a seismic risk you re likely susceptible to seismic hazards Using the Seismic Hazard Map the USGS rates the areas risk with color coding What s going on in Columbia SC gt Most tsunamis occur in the Pacific gt Early warning centerequipment is in Pacific and Hawaii Earthquake Hazards 1 Shaking 2 Landslides mass movements 3 Fires 4 Tsunami 5 Liquefaction Wet clay liquefies when shaken primarily a coastal effect gt You don t want to build large tall buildings on this bay fill gt Part of the reason why Charleston was affected so much Charleston is on a lot of this natural fill that liquefies when it is shaken up Where is the most of the mass of an iceberg located a Above the water surface b Below the water surface c Equal mass above and below the water surface Ans b Below the water surface The principle of isostasy Crust acts like an iceberg in the ocean gt Concept of a floating crust gt When weight is removed from the crust it rises up Erosion and resulting isostatic adjustment of the crust Mountan range Oceanic crust The crust IS floating In the asthenosphere Through time erosion starts to wear the mountain range away Starts moving the masses to the sides As a result the coastline starts to sink from the weight pressing on it and the mountains began to 7L T h riseuplift As a result we Depositio quot quot 39 reactivate really old faults quot g causing fault failure leading to earthquakes Crustal Deformation gt What is Deformation gt Brittle and Ductile behavior of rock 0 Brittle Material breaks into pieces 0 Ductile Material changes shape but doesn t break I Folds Ductile deformation of rocks under a lot of compression Happen in sets 0 Anticline ARCHshaped fold I Limbs dip away from central point or hinge o Syncline Opposite troughshaped fold What is this geologic landform H a Anticline b Valley c Hill d SyncHne Ansc Hill Deformation Are we modifying the shape by the rock layers No That is just a hill What is a structural landform You have the grassy surface then the rock strata In the last picture there was a hill this one is flat but these layers have been bent into an arch This is deformation These layers are preserved and reflected that structural event You would describe this as an anticline What gets trapped in anticlines Oil gt If you see an anticline at one place keep driving expect to see a syncline soon a trough You cannot have one without the other 0 The direction of the rock makes it a synclineanticline Not the fact that it has a hill gt Quarry in Pennsylvania that has intense antisynclines