EOSC 114_ EARTHQUAKES EXAM WITH COMPLETE SOLUTIONS
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Course
EOSC 114
Institution
EOSC 114
earthquakes...
associated with rupture of a fault
accumulated stress released as seismic energy
seismic waves radiate
causes shaking
3 types of stress
COMPRESSION -- convergent
forces opposite
towards each other
TENSION -- divergent
forces opposite
opposite direction from each ot...
blocks move towards each other
hanging wall moves UP -- gets smaller & push
compression -- shortening and thickening
low angle thrust
shallow to deep foci
lateral, not vertical (like traffic on a highway)
horizontal motion
no extension/shortening
shallow foci
global distribution of earthquakes - ANSWER- along plate boundaries / fault lines
frequency decreases with magnitude
which faults are most common at which types of plate boundary - ANSWER-
CONVERGENT: subduction/collision, reverse/thrust fault
force: compression
deep, m8-9.7, infrequent, plate interface, overriding plate, depends on
vulnerability
DIVERGENT: normal fault
force: tension
shallow (<30km), m6, frequent lil quakes, mid ocean, low risk
TRANSFORM: strike slip
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