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Ex5_SeismicRefraction

# Ex5_SeismicRefraction - GEO594/GLE594 Seismic Refraction...

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GEO594/GLE594: Seismic Refraction Homework 1. Construct a travel time curve to a distance of 120 m for a structure with an 10 m thick soil layer with P-wave velocity 500 m/s over a saturated layer 20 m thick with P-wave velocity 1500 m/s over bedrock with velocity 3000 m/s. From the graph, what are the 2 crossover distances? Does the first crossover distance value agree with what you calculate using the following equation? (6 points) 1 2 1 2 1 2 V V V V h x co + = 2. Construct a travel time curve for the following data for both the forward and reverse profiles. Evaluate slopes and intercept times, and use those values to determine the subsurface structure for the first 2 layers, and then estimate (do not try to calculate!) the properties of the bottom layer. Offsets are in meters and times are in milliseconds. (8 points) Offset x 5 10 15 20 25 30 35 40 45 50 55 60 Forward 8.3 16.7 25.0 33.3 41.7 50.0 58.3 66.7 72.5 75.1 77.7 80.3 Reverse 8.3 16.7 25.0 33.3 40.7 44.3 48.0 51.6 55.3 58.9 62.6 66.3 Offset x 65 70 75 80 85 90 95 100 105 110 115 120 Forward 82.8 85.4 86.5 87.4 88.3 89.2 90.0 90.9 91.8 92.7 93.6 94.5 Reverse 69.9 73.6 77.2 80.9 84.5 86.1 87.4 88.7 90.0 91.4 92.7 94.0 3. The following data are from a profile over a buried steep fault scarp underlying alluvium.

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Ex5_SeismicRefraction - GEO594/GLE594 Seismic Refraction...

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