Major Plates of the World
Historical Movement (Past 250mya)
Evidence of Past Plate Movement
Plate Boundaries
Plate boundaries are seismically active:
EarthquakesVolcanoesMountains
Causes of Earthquakes
• Eruption of a volcano• Collapse of a cavern• Impact of a meteor• Stress that builds up between two
lithospheric plates.
EQ’s release energy in the form of waves
EQ waves are recorded using a Seismograph
Earthquake P-Wave and S-Wave Travel Time – For EQ Location
Can you find the Epicenter?
• Seismic Stations P-wave arrival times:• Calculate:
– 1. distance from seismic station and;– 2. epicenter for each case study.
• Case Study I:
– Denver 2:40– New Orleans 2:00– Scranton 2:50
• Case Study II:
– Cancun 4:00– Boston 3:20– Juneau 4:50