EARTHQUAKES Information from the USGS Locations of Earthquakes Dots are earthquakes.

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Presentation transcript:

EARTHQUAKES Information from the USGS

Locations of Earthquakes Dots are earthquakes

Locations of Earthquakes Earthquakes occur in a pattern

Tectonic Plates Pattern of earthquakes follows plate boundaries You are HERE

Tectonic Plates There are ~23 major plates

Plate Boundaries Three types of interactions between plates as they move around

Plate Boundaries Sliding past one another - transform boundary

Plate Boundaries Running into one another - convergent boundary

Plate Boundaries Moving away from one another - divergent boundary

3 Types of Faults Form depending on: –type of plate motion –complex reaction of earth’s lithospheric blocks

3 Types of Faults Strike-slip fault

3 Types of Faults Normal fault

3 Types of Faults Thrust

Examples of Faults Strike-slip fault

Examples of Faults Strike-slip fault: 1906 San Francisco Manure pile Old position of pile

Examples of Faults Strike-slip fault: 1906 San Francisco

Examples of Faults Normal fault: DOWN Fairview Peaks, NV 1954

Examples of Faults Thrust fault: UP

Slip Happens Slip is the amount of movement in any given place.

Slip Happens Slip is the amount of movement in any give place. Slip is NOT equal throughout an earthquake zone

See Slip Here is a cross-section of “slip” during a ‘quake. Blue = none, Red = a lot

Slip Happens Slip changes over the time span of the earthquake event

 Depth Into the earth Surface of the earth Distance along the fault plane 100 km (60 miles) Slip on an earthquake fault START

Slip on an earthquake fault Second 2.0

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