Download Mapping Earthquakes and faults with USGS (United

Name ___________________________________
Mapping Earthquakes and faults with USGS (United
States Geological Survey)
1) Go to http://earthquake.usgs.gov/earthquakes/map/
2) Click on the
gear symbol in the upper right corner of the screen.
You can turn on and off the list of earthquakes with the list symbol:
3) Choose a time and magnitude range of earthquakes.
Try: 7 days, all magnitudes, worldwide
4) Try different map layers. Terrain looks nice, and loads quicker than satellite.
Q4) Which two states have the most earthquakes?
California and Alaska
5) Turn on plate boundaries. Zoom out to see the whole world view.
Q5) Do most earthquakes fall within the tectonic plates, or on the boundaries of
tectonic plates?
Most earthquakes occur on plate boundaries.
6) Turn on US hazard map.
Q6) Describe which areas have high seismic hazard.
California, Alaska, Hawaii, Tennessee/Mississippi, South Carolina
Turn hazard back off.
7) Turn on US faults. Zoom in to Southern California. There is one small fault that
runs through San Diego. Hover the mouse over the fault to see its name.
Q7) What is the name of the fault that runs through San Diego?
Rose Canyon Fault or Newport-Inglewood/Rose Canyon Fault.
8) The San Andreas Fault zone has three main branches in Southern California.
These are just to the northeast of San Diego.
Q8) What are the names of these three faults?
Elsinore Fault, San Jacinto Fault, Southern San Andreas Fault
Q9) Which one of these three faults has had the most earthquakes on your map?
San Jacinto Fault
Q10) Which of these three faults has had the fewest earthquakes?
Southern San Andreas Fault
Q11) Which of these three faults might be overdue for a very large earthquake?
Southern San Andreas Fault