EQ 2a: stress/fault, depth range, max size, locations, risk

Very important!REVIEW

divergent plate boundary: stress, fault?

Tensional, normal

divergent plate boundary: depth range

Very shallow, in lithosphere, 10 km (mostly upper 5km)

divergent plate boundary: max EQ size?

Not very big.. lithosphere hot and weak. Max mag 6

divergent plate boundary: locations?

mid atlanic ridge, continental rifts, east african ridge

divergent plate boundary: risk?

very low for a mid-ocean under sea ridge

Convergent Subduction zone boundary: stress, fault?

compressional, reverse

Convergent Subduction zone boundary: depth range?

three zones! all zones from surface to 700 km deep

Convergent Subduction zone boundary: max size?

Biggest! lithosphere is cold and strong, mag up to 9.5

Convergent Subduction zone boundary: locations

1) plate interface

2)overriding plate

3) down going plate

Convergent Subduction zone boundary: risk?

depends on population density, vulnerability, distance from hypocenter

Convergent continent collision boundary: stress, fault?

compressional, (mostly thrust) and reverse

Convergent continent collision boundary: depth range?

upper 50 km, some down to 200km

Convergent continent collision boundary: width of zone?

very broad, well back into overriding plate

Convergent continent collision boundary: max size?

high. potential for major earthquakes, mag 8

Convergent continent collision boundary: risk?

high. high hazard and over populated

transform plate boundary: stress, fault?

shear, strike slip

transform plate boundary: depth range?

mostly in upper 25 km

transform plate boundary: width of zone?

generally narrow but fault zones can be complex

transform plate boundary: frequency?

variable (short to long recurrence intervals intervals)

transform plate boundary: risk?

depends on location

Order of boundaries from strongest to weakest for earthquakes

Convergent, Transform, Divergent