The Seismic Refraction method depends on the principal that seismic waves possess varying compression and shear wave velocities within differing types of soil and rock material. Acoustic energy waves are refracted when they cross over between soil and/or rocks of differing (and increasing) seismic velocities. Analysis of refracted wavelet arrival times, velocities, and geophone geometries can be used to estimate general soil types and approximate depths to strata boundaries, water tables and/or the upper bedrock surface to be determined. The Seismic Refraction method is also used to estimate rock rippability characteristics for pre-construction planning using Caterpillar seismic velocity soil/rock rippability charts. Seismic refraction surveys commonly involve laying out a spread of geophones in a straight line, with seismic impact source points positioned with and off the ends of the geophone spread. Problem 1) Determine the depth to bedrock for a site. _meters 2) Determine the velocity of the overburden meter/second and 3) Determine the velocity of the bedrock_ _ meter/second. 4) Critical distance from the source point _meters Geophone 1 is 20 meters from the shot point and each geophone is 20meters from the next one. Geophone First Arrival time ( seconds) 10.015 2 0.031 3 0.046 4 0.062 5 0.077 6 0.089 7 0.094 8 0.099 9 0.105 10 0.110 11 0.115 12 0.121
The Seismic Refraction method depends on the principal that seismic waves possess varying compression and shear wave velocities within differing types of soil and rock material. Acoustic energy waves are refracted when they cross over between soil and/or rocks of differing (and increasing) seismic velocities. Analysis of refracted wavelet arrival times, velocities, and geophone geometries can be used to estimate general soil types and approximate depths to strata boundaries, water tables and/or the upper bedrock surface to be determined. The Seismic Refraction method is also used to estimate rock rippability characteristics for pre-construction planning using Caterpillar seismic velocity soil/rock rippability charts. Seismic refraction surveys commonly involve laying out a spread of geophones in a straight line, with seismic impact source points positioned with and off the ends of the geophone spread. Problem 1) Determine the depth to bedrock for a site. _meters 2) Determine the velocity of the overburden meter/second and 3) Determine the velocity of the bedrock_ _ meter/second. 4) Critical distance from the source point _meters Geophone 1 is 20 meters from the shot point and each geophone is 20meters from the next one. Geophone First Arrival time ( seconds) 10.015 2 0.031 3 0.046 4 0.062 5 0.077 6 0.089 7 0.094 8 0.099 9 0.105 10 0.110 11 0.115 12 0.121
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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provide A and B both answer with explanation
Transcribed Image Text:The Seismic Refraction method depends on the principal that seismic waves possess varying compression and shear
wave velocities within differing types of soil and rock material. Acoustic energy waves are refracted when they cross over
between soil and/or rocks of differing (and increasing) seismic velocities. Analysis of refracted wavelet arrival times,
velocities, and geophone geometries can be used to estimate general soil types and approximate depths to strata
boundaries, water tables and/or the upper bedrock surface to be determined. The Seismic Refraction method is also
used to estimate rock rippability characteristics for pre-construction planning using Caterpillar seismic velocity soil/rock
rippability charts. Seismic refraction surveys commonly involve laying out a spread of geophones in a straight line, with
seismic impact source points positioned with and off the ends of the geophone spread. Problem 1) Determine the depth
to bedrock for a site. _meters 2) Determine the velocity of the overburden meter/second and 3) Determine
the velocity of the bedrock_ _ meter/second. 4) Critical distance from the source point _meters Geophone 1
is 20 meters from the shot point and each geophone is 20meters from the next one. Geophone First Arrival time (
seconds) 10.015 2 0.031 3 0.046 4 0.062 5 0.077 6 0.089 7 0.094 8 0.099 9 0.105 10 0.110 11 0.115 12 0.121
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