13. The following table gives two-way travel-times ofseismic waves reflected from different reflecting inter-faces in a horizontally layered medium.Travel-time [s] toGeophone toshot-pointdistance [m]SecondreflectorThirdreflectorFirstreflector0.2990.5660.3640.5170.5920.638500100015000.8410.7010.7081.1171.39320000.8970.79925001.0990.896(a) Draw a plot of (travel-time)? against (distance)?.(b) Determine the vertical two-way travel-time("echo-time") and average velocity to eachreflecting interface.(c) Compute the depth of each reflector and thethickness of each layer.(d) Compute the true velocity (interval velocity) ofeach layer. (e) Verify your results by computing the total verti-cal travel-time for a wave reflected from thedeepest interface.

Answered: Image /qna-images/answer/4637b7d6-023b-42d3-9b3d-46832c09f73b.jpg

13. The following table gives two-way travel-times of seismic waves reflected from different reflecting inter- faces in a horizontally layered medium. Travel-time [s] to Geophone to shot-point distance [m] First reflector Second reflector Third reflector 0.299 0.566 0.841 1.117 1.393 500 0.364 0.592 1000 1500 0.517 0.638 0.701 0.897 0.708 0.799 2000 2500 1.099 0.896

13. The following table gives two-way travel-times of seismic waves reflected from different reflecting inter- faces in a horizontally layered medium. Travel-time [s] to Geophone to shot-point distance [m] First reflector Second reflector Third reflector 0.299 0.566 0.841 1.117 1.393 500 0.364 0.592 1000 1500 0.517 0.638 0.701 0.897 0.708 0.799 2000 2500 1.099 0.896

Structural Analysis

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ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

State Plane Coordinate Systems

The state plane coordinate system (SPCS or SPS) is a collection of 124 coordinate systems or geographic zones prepared for particular regions of the U.S. Every state consists of one or more than one state plane zone, the boundaries of which generally follow the county lines. Inside the U.S., there are 110 zones in total, 10 more zones in Alaska, 5 in Hawaii, and 1 for Puerto Rico and US Virgin islands. The system is extensively used for geospatial and geographic data assembling by the state and local governments.

Question

13. The following table gives two-way travel-times of
seismic waves reflected from different reflecting inter-
faces in a horizontally layered medium.
Travel-time [s] to
Geophone to
shot-point
distance [m]
Second
reflector
Third
reflector
First
reflector
0.299
0.566
0.364
0.517
0.592
0.638
500
1000
1500
0.841
0.701
0.708
1.117
1.393
2000
0.897
0.799
2500
1.099
0.896
(a) Draw a plot of (travel-time)? against (distance)?.
(b) Determine the vertical two-way travel-time
("echo-time") and average velocity to each
reflecting interface.
(c) Compute the depth of each reflector and the
thickness of each layer.
(d) Compute the true velocity (interval velocity) of
each layer.

(e) Verify your results by computing the total verti-
cal travel-time for a wave reflected from the
deepest interface.

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