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Geography

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Dec 6, 2023

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Geog 2320: Geomorphology J.Koch Kwantlen Polytechnic University Fall 2023 Lab 2 Volcanoes in the Cascades Mount St. Helens, Washington Different volcanic landforms can be observed within a 15 km radius at Mount St. Helens (46° 11.492'N, 122° 10.626'W). Locate these landforms, mark each with the ‘Placemark’ tool and label it. Save several images from Google Earth showing these landforms, and send them to me via email. (6) Crater Lake, Oregon 1. Use the ruler to collect the data needed to calculate the surface area of Crater Lake (42°

56.322'N, 122° 6.250'W). (3) Diameter of Crater Lake = 7685 Surface area of Crater Lake = 185,445,967 2. Describe the cross-sectional shape of these two valleys [(42° 54.073'N, 122° 5.788'W) and (42° 54.676'N, 122° 4.166'W)]. How are these types of valleys generally formed? How can you explain their existence, and what do they indicate in regard to the history of Crater Lake? (4)  Cross-sectional shape of the valleys is u shaped. These valleys are formed by pyroclastic flows. They made from the volcanic eruption and the volcanic disruption that changed its shape from the past. And it also displays that there was a volcano there which then sank in the lake. 3. Give the location of the most recent volcanic landform of Crater Lake? (1)  Wizard island [(42o56’16.74”N 122o08’45.55”W)] Davis Lake, Oregon 1. Enter this location (43° 38.433'N, 121° 49.041'W), and determine the thickness of the flow by comparing the elevation of the flow at this location (43° 37.981'N, 121° 48.982'W) with the elevation of the land surface here (43° 37.912'N, 121° 48.799'W). Do the same here (43° 37.548'N, 121° 49.323'W) and compare it to the elevation of the land surface here (43° 37.474'N, 121° 49.200'W). Thickness of flow at first location (1)

 (43° 37.981'N, 121° 48.982'W) has an elevation 1406 m and (43° 37.912'N, 121° 48.799'W) is 1395 m. the thickness of the flow is 11 m. Thickness of flow at second location (1)  (43° 37.548'N, 121° 49.323'W) has an elevation of 1382m and (43° 37.474'N, 121° 49.200'W) has an elevation of 1352 m. the thickness is 30 m.

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What might account for the variation in thickness of the flow observed at those two locations? (2) 2. Using the same methods as in 1. determine the average thickness of the flow in the area within the sample rectangle marked by those four locations (A: 43° 38.041'N, 121° 49.317'W; B: 43° 37.850'N, 121° 48.967'W; C: 43° 37.477'N, 121° 49.378'W; D: 43° 37.704'N, 121° 49.765'W). Report your measurements in meters. Average thickness of the flow within the sample rectangle (1) Use the ruler tool to make the measurements necessary to calculate the surface area of the sample rectangle. As last step, calculate the approximate volume of the lava in the sample rectangle. Measurements made (2) Surface area of sample rectangle (2) Volume of lava in sample rectangle (2)

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