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
Slip on an earthquake fault Second 4.0
Slip on an earthquake fault Second 6.0
Slip on an earthquake fault Second 8.0
Slip on an earthquake fault Second 10.0
Slip on an earthquake fault Second 12.0
Slip on an earthquake fault Second 14.0
Slip on an earthquake fault Second 16.0
Slip on an earthquake fault Second 18.0
Slip on an earthquake fault Second 20.0
Slip on an earthquake fault Second 22.0
Slip on an earthquake fault Second 24.0