 |
GPH701S - GEOPHYSICS - 1ST OPP - JUNE 2023 |
|
|
1 Page 1 |
▲back to top |
nAmlBIA UnlVERSITY
OF SCIEnCE Ano TECHnOLOGY
FACULTY OF HEALTH, NATURAL RESOURCES AND APPLIED SCIENCES
SCHOOL OF NATURAL AND APPLIED SCIENCES
DEPARTMENT OF BIOLOGY, CHEMISTRY AND PHYSICS
QUALIFICATION: BACHELOR OF SCIENCE
QUALIFICATION CODE: 07BOSC
LEVEL: 7
COURSE CODE: GPH701S
COURSE NAME: GEOPHYSICS
SESSION: JUNE 2023
DURATION: 3 HOURS
PAPER: THEORY
MARKS: 100
EXAMINER {S)
MODERATOR:
FIRST OPPORTUNITY EXAMINATION QUESTION PAPER
MR EMMANUEL EJEMBI
MR OLUWOLE JACOB OLUWASANMI
INSTRUCTIONS
1. Write all your answers in the answer booklet provided.
2. Read the whole question before answering.
3. Begin each question on a new page.
PERMISSIBLE MATERIALS
Scientific Calculator
THIS QUESTIONS PAPER CONSISTS OF 4 PAGES {Including this front page)
1
|
|
2 Page 2 |
▲back to top |
QUESTION 1
(15)
1.1 State the two divisions of geophysical survey methods.
(4)
1.2 List four appropriate survey methods used for the exploration of fossil fuels.
(2)
1.3 What is the measured parameter of seismic travel?
(3)
1.4 Briefly explain the inner core layer of the earth's structure.
QUESTION 2
2.1 What are the differences between body and surface waves?
(6)
(20)
(5)
2.2 What do you understand by the term Young's modulus {Y) of an elastic body?
(5)
2.3 Write down the equation for the travel time of a single horizontal refractor and
(5)
define the various parameters.
2.4 A seismic wave travelled through the earth's interior, with a velocity of 500 m/s and
(5)
refracted at a velocity of 5400 m/s. If the travel time for the geophone at the shot point is
34 x 10-3 seconds. Calculate the depth of the refractor below the shot point.
2
|
|
3 Page 3 |
▲back to top |
r,
rr
QUESTION 3
(15)
3.1 State the universal law of gravitation.
(2)
3.2 Show that the magnitude of acceleration due to gravity on the Earth's (g) is given as
(6)
3.3 What are the objectives of data enhancement process?
(3)
3.4. Briefly explain the low velocity layer.
(4)
QUESTION 4
(20)
4.1 What do you understand by the term gravity anomaly?
(2)
4.2 State six applications of gravity method of geophysical survey.
(6)
4.3 Write down the equation for the gravity effect of a horizontal sheet of infinite length (5)
and define the various parameters.
4.4 Determine the gravity anomaly due to an infinite horizontal slab of a granite of 12 km thick,
and a density of 2.67 gm- 3 (Taking G = 6.67 x 10- 11 m2 s- 2 kg- 1 and TI= 3.142 ). (7)
3