EESA06H3 Lecture Notes - Lecture 5: Geysir, Tephra, Basalt
● If you start moving one plate around, the rest of the plates evidently move too
● Red sea = embryonic ocean
● Arabian plate is being pushed to the NOrth into Eurasian plate
○ Turkey wants to get away from that collision
○ NAF → north anatolian fault
■ Accommodates movement of Turkish plate to the west
○Cascading earthquakes →
cascade along the fault
■ Move like a zipper opening
■ Istanbul is sitting on here
● African plate and Arabian plate is both moving North but at different velocities
● ALPs
○ Result of Africa coming up and colliding with Eurasia
● Dead sea rift: 420 m below sea level
○ Death valley → not much living there, a lot of salt, hot dry
○ So much evaporation, water is much more salinity (10X) than normal sea
○ Can float very easily in the water
● Transform boundary
○ Between Sinai (s) and Arabian (a) plates
○ Both are moving north but relative to each other they are moving at different
velocities
○ Rocks are being pulled apart
Petra, Jordan
● Abandon city carved into rock
● Important trade center
● Where horses and animals get water
● Disuse caused by earthquake
○ 363 AD earthquake
○ Ending use of the city
○ Rediscovered at beginning of 19th century
Ancient Roman city of Hippos
● Destroyed by
● Historic records
● If people want to understand seismic risk
● Recurrence intervals → frequency of the big earthquakes
○ We know the amount of force needed to destroy buildings
○ We need to know where it happened
○ We can see how distant we are from the earthquake that happened in the past
● Fault is releasing one way and then
closes up again
● Red sea is pushing Arabian plate to
the North
● We can actually see a MOR
exposed on land in Iceland
● Passive margin
○no volcanic activity now
○ Small earthquakes
○ Eastern North America
● Active margin
○ West side
○ Subduction zones
● Continental shift
○ Large rivers come down
and dump sediment and other things
Document Summary
If you start moving one plate around, the rest of the plates evidently move too. Arabian plate is being pushed to the north into eurasian plate. Turkey wants to get away from that collision. Accommodates movement of turkish plate to the west. Cascading earthquakes cascade along the fault. African plate and arabian plate is both moving north but at different velocities. Result of africa coming up and colliding with eurasia. Dead sea rift: 420 m below sea level. Death valley not much living there, a lot of salt, hot dry. So much evaporation, water is much more salinity (10x) than normal sea. Can float very easily in the water. Between sinai (s) and arabian (a) plates. Both are moving north but relative to each other they are moving at different velocities. If people want to understand seismic risk. Recurrence intervals frequency of the big earthquakes. We know the amount of force needed to destroy buildings.
