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Seismology ( GHT 409 ) – 2013


Department of Geology
University of Dhaka
Fourth -Year B.S. Honor’s Course -Final Examination 2013
Subject: Geology
Course: GHT 409 Course Name: Seismology
Subjective Part
Time 2 Hours Full marks 25

The figure at the right margin indicates full marks. Answer any five of the following questions. Answers should accompany suitable sketches and/or diagrams wherever necessary.

1.
a) Explain the elastic rebound theory of earthquakes on a fault. 1.5
b) Discuss the seismic cycle. 1.5
c) Define focal mechanism and discuss the fault geometry used in earthquake study. 2.0

2.
a) What do you mean by historical and instrumental earthquakes? 1.5
b) How are historical earthquakes studied? 2.0
c) Described the method of locating earthquakes from waveform data. 1.5

3.
a) What is seismicity? 1.0
b) What are interplate and intraplate earthquakes and their causes? 1.5
c) Describe the global distribution of earthquakes associated with different types of plate, settings. 2.5

4.
a) How do you read a seismogram? 1.0
b) Sketch a cross-section of the Earth showing the travel paths of P and S waves and their shadow zones. 2.0
c) Explain the procedure of finding the epicentre of an earthquake. 2.0

5.
a) What are (i) tectonics, (ii) neotectonics, and (iii) active tectonics? 1.5
b) What is an active fault? How would you recognize active faults? 1.5
c) Describe the geodynarnics of Bangladesh and its surroundings associated with major earthquakes. 2.0

6.
a) Differentiate between the primary and secondary seismic hazards. 1.0
b) What is liquefaction? Why does it occur? 2.0
c) Write down the characteristics of tsunami. Describe its severity with an example. 2.0

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