Ta check lab 7 geologic hazards of whatcom county 103

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__________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ TA CHECK ______________
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Lab #7: Geologic Hazards of Whatcom County 103 6. Consider your results for the slope stability and the liquefaction experiments. How might earthquakes trigger landslides? ________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ 7. Look at the figures below. The top figure is a photograph of the Bellingham waterfront in 1912. The bottom figure is a photograph of the same area in 2010, after the area has been built up. Notice the difference in the location of the shoreline between the two images. Natural sedimentation is too slow to produce such dramatic affects, so this was a man-made change. Sand and mud was dredged from the bottom of Bellingham Bay and placed on the shore to extend the waterfront area. The sediment was not compacted before it was developed into what we see today. a. You have shown that there are hazards associated with building on unconsolidated sediment. Which hazard has the greater risk for the waterfront area of Bellingham, landslide or liquefaction? Why? ________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ TA CHECK ______________ railroad track downtown streets
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Lab #7: Geologic Hazards of Whatcom County 104 Homework Activities Activity 1: Mass Wasting 1. What would happen to houses built on slopes made of unconsolidated sediments during periods of heavy or prolonged rain? _____________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ 2. Vegetation is often used to stabilize slopes prone to failure, and has had mixed results. How does vegetation help stabilize the slope? How might it make the slope more unstable? ________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ Activity 2: Earthquakes 1. The Bellingham Waterfront. Go to Canvas and open Lab7_2-2_BellinghamWaterfront.kmz . Two placemarks are noted in this file, one for the waterfront itself and one for a Bellingham home. Fly around and try to identify the original coastline. Hint : It might help if you increase the vertical exaggeration. You can do so by going to Tools 1 Options 1 3D View tab 1 Terrain 1 Elevation Exaggeration (0.1 - 3, 3 being the highest). a. Which feature helps identify original coastline? ______________________________________________ ________________________________________________________________________________________ b. What street may have been under water in the 1920’s? __________________________________________ Hint : If the road names are not shown, select the Roads checkbox in the Layers panel to the left. c. Which street would have been parallel to the beach in the 1920’s? _________________________________ d. Now look at the Bellingham Waterfront home. This home was for sale for quite some time. The original asking price was $1.2 million. It eventually sold for less than half that price. Although there were likely several reasons for this, describe some possible geologically-based reasons. ________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ Activity 3: Volcanoes 1. Go to Canvas and open Lab7_3-1_MtRuapehu.kmz . This placemark is at the seam between two images, one taken on January 31, 2005 (green) and May 22, 2007 (grayish brown). Notice the differences in the stream valley between these two times. a. What happened during the 28 months between these images? ___________________________________ ________________________________________________________________________________________ b. The deposits from this event are what was left behind when a lahar traveled down Mt. Ruapehu. Given the distribution of the deposits, which path do lahars take (what topographic features control the path of lahars)?
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