Occurrence of Earthquakes in the U.S.:

• Aim: to explore the occurrence and characteristics of recent earthquakes in California and elsewhere in the U.S..
• Website:  http://quake.wr.usgs.gov/QUAKES/CURRENT/index.html
• Contents: listings of links to real-time earthquake maps, seismogram displays and other earthquake information.
• Measurements and details of earthquakes from seismographs.
• Assesment of earthquake intensity from shakemaps.

• The site provides a listing of links to maps and other information that describes the occurrences of earthquakes in various regions.
• Select California under the title "Real-time Earthquake Maps."
• This site presents a map of California indicating the positions and magnitude of earthquakes in the past week.
• The earthquakes are color-coded according to their time of occurrence (last hour, last day, last week) 
• The size of the square representing each event is proportion to the magnitude of the earthquake. 
• Each square provides a link to a close-up map of the vicinity of the event and a listing of all earthquakes within that area, which link to details of the individual events.
• Below the map of California are notes (including the number of earthquakes on the map) and descriptions that include links entitled:
• Did you feel it?
• ShakeMaps for Southern CA and Northern CA
• Special maps for Long Valley, Los Angeles and San Francisco
• Lists of big earthquakes and all earthquakes
• In the exercise information from these various links will be examined.
• Separately select United States under the title "Real-time Earthquake Maps" and click on Mid-America on the map.
• This site presents a map of the central U.S. indicating the positions and magnitude of earthquakes in the past week and past 6 months.
• The earthquakes are color-coded according to their time of occurrence (past hour, past week, past 6 months) 
• The size of the square representing each event is proportion to the magnitude of the earthquake. 
• Each square provides a link to a close-up map of the vicinity of the event and a listing of all earthquakes within that area, which link to details of the individual events.
• Below the map of the central U.S. are notes (including the number of earthquakes on the map) and descriptions that include links entitled:
• Did you feel it?
• big earthquakes
• all earthquakes
• In the exercise information from these various links will be examined.

• A separate page describes background information on shakemaps . 
• The questions are outlined in three separate tables:
• question sets for California ( next page and following two pages )
• a question set for the Central and Eastern U.S. ( subsequent page )
• Reminder: you should submit your answers via  oncourse .

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Department of Geological Sciences, 
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Phone: (812) 855-5582  Last updated: 1 October 2002
Comments: simon@indiana.edu
Copyright 2002, The Trustees of Indiana University