The Earth is layered. Major Plates of the World Mantle Convection.

The Earth is layered

Major Plates of the World

Mantle Convection

Historical Movement (Past 250mya)

Pangaea

Evidence of Past Plate Movement

Ice Sheets

Magnetic Reversals

Magnetic Reversals

Magnetic Reversals

Magnetic Reversals

Location of Earthquakes

Convergent Boundaries

Transform Boundary

Divergent Boundary

Plate Boundary Review

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 Terminology

EQ’s release energy in the form of waves

P and S waves

EQ waves are recorded using a Seismograph

Earthquake P-Wave and S-Wave Travel Time – For EQ Location

Locating EQ’s

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