The only I was given to complete this problem was the seismograph: The following

Question

The only I was given to complete this problem was the seismograph:

The following seismograph was acquired in an area where the dip of the refractor is known to be zero (parallel to the surface)

1. Determine the geophone station spacing (to the nearest integer number of meters)

2. Draw a traveltime graph showing the direct and refraction arrival times.

3. Determine Velocity 1, Velocity 2 and the depth to the refractor. Draw a sketch of your subsurface model.

4. Add a reflection traveltime curve.

Thanks!

INTRO. TO APPLIED GEOPHYSICS GEOL 4/5850 FALL 2015 mework Set 2 - Seismic Refraction and Reflection Due: Thursday 9/10/15 sure to show all of your work and reasoning. 1) The following seismogram was acquired in an area where the dip of the refracto is known to be zero (i.e., parallel to the surface). Determine the geophone stati (to the nearest integer number of meters). Draw a traveltime graph showing the direct and refraction arrival times. Determine VI, V2, and the depth to the refractor. Draw a sketch of your subsurface model. OD Retlectior a E52 401 EGG GEOMETRICS 15:34 28/0C/1993 1-24 UNSAVED STACKED DATA CONSTANT 888 SHOT LOC 218 SAMPLEINTRUL8JAMSRECORD LEN153ASDELAY IAS STACKS 8 8888 8888 LINE NUMBER 1888 SHOT KAP SHOT INIRVL 18 OFFSET 18CROUP INTRVL 10 NOTCH 68 H2 , a HIGH, CUT . 25017 ,8AGC WIND042 28 MS -, ^“- LOW CUT 35 HZ 18 18 18 1e 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 100 Analyze the data in Problem 3.5 of the textbook two ways. First, using the equations derived in class, interpret these data for the top two layers only. The use the program REFRACT to characterize all layers evident in these data.

Explanation / Answer

1. Geophone station spacing is nothing but the group interval, which was given in the seismogram as 18m.

2.Travel time curve is nothing but a reocrd of velocity of waves at different layers. To draw the travel time curves travel times and distance between the shot and geophone should be known.

3.Velocities can be determined from the graf by getting correct slopes. The depth of the refractor can be know when the velcoities and time are known.

A single seismogram which was given is a visual record of the subsurface geology and interpret it in the form of clear subsurface structure. Without the sufficient data as above, solution cannot be full filled from only a seismogram.

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