# Geology 1 MT2: EQs

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The flashcards below were created by user kjel on FreezingBlue Flashcards.

1. earthquake
the sudden slip on a fault (release of elastic energy) and the resulting ground shaking and radiated seismic energy caused by the slip
2. hypocenter (focus)
• the first point on a fault that moves in an EQ
• the EQ originated at the hypocenter
3. epicenter
the point on the earth's surface that is directly above the hypocenter
4. rupture area
the portion of a fault that slips in an EQ
5. surface trace
where the fault breaks the earth's surface
6. blind fault
a fault that does not break the earth's surface
7. elastic rebound theory
• 1. stresses (force/area) are applied to a fault
• 2. strain (deformation) accumulates in the vicinity of friction-locked faults
• 3. strain accumulation reaches a threshold and fault slips suddenly
• 4. rupture (slip) continues over some portion of the fault
8. 2 types of seismic waves
• body waves - move through the earth's interior
• surface waves - through earth's surface
9. 2 types of body waves
• p-wave: (primary wave)
• the first wave to arrive following an EQ
• propogate by alternately compressing/expanding material
• can move through solids, liquids, gases

• s-wave: (secondary wave)
• shear wave
• can only move through solids
10. 2 types of surface waves
Love wave: horizontal shearing of the earth's surface

Rayleigh wave: "rolling" of the earth's surface
11. calculating the distance to an EQ
depends on the time gap b/t p-waves and s-wave arrivals (∆ t)

• ∆ t = ts - tp
• [ts= s-wave arrival time, tp= p-wave arrival time]

D= (Vp x Vs) / (Vp - Vs) x ∆ t
12. what is Richter magnitude based on?
the amplitude of the largest s-wave
13. 4 steps to find Richter magnitude:
• Find distance
• Measure amplitude and find log
• Find log A0 from graph
• Find difference: ML= logA - logA0
14. A fault that has both horizontal and vertical offset
oblique fault
15. Fault that moves without an EQ
fault creep

### Card Set Information

 Author: kjel ID: 80826 Filename: Geology 1 MT2: EQs Updated: 2011-05-09 17:06:31 Tags: Geology MT2 EQs Folders: Description: Geology 1 MT2: EQs Show Answers:

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