# Geophysics 355-University of Calgary

## Geophysics (GOPH 355-UCAL) Midterm Exam I

The exam will be part written and part MC

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Credits: Based on the excellent class notes provided by, Dr. Kristopher Innanen during Winter 2013.
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### Intro to Geophysics Midterm I Concepts

– Fermat’s and Huygen’s principles

• What are the two tenets of them?
• How does it related to wave propagation?

– Different types of modules

• E, k, λ, etc
• What each of them represent?

– Snell’s Law

• What is a critical angle?
• What happen to a ray that enters into a medium at exactly at it’s critical angle?
• What is the behavior of a ray that would enter a medium that allow it to travel faster than the incident medium?
• What is the relation between the law and the seismic waves?

– What are the two types of seismic waves and how do their behaviors differ from each other?
– Can you do the proofs of all the formula used in class?
– Understanding shot records

• Be able to recognize a shot record
• Where is the ground roll, air blast, the source, direct arrival, reflected arrival?
• What is noise and most of which concentrated where on the shot record?
• What is recorded on x and y axises of a shot record?

– Several types of waves generated by a seismic source

• Head wave, direct wave, reflected wave, transmitted wave, etc
• How do they differ from each other?
• Which is relatively faster and what are the implications of it?
• Why do we care about different types of waves?

– What are the four types of gather?
– What is RMS, NMO and zero-offset?

## Geophysics (GOPH 355-UCAL) Midterm Exam II

Some questions have hints and explanations. Click Start to begin.

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