Transcript Earthquake Catalogs Powerpoint Final 3
Earthquake Catalogs
Major Earthquake Catalogs
NEIC PDE (National Earthquake Information Center Preliminary Determination of Epicenters)
Global catalog
Creates a list of all earthquakes in specific areas
Global CMT (Global Centroid Moment Tensor)
Specific earthquake information used to calculate focal mechanisms
GNS (Institute of Geologic and Nuclear Science)
Specific earthquake information in New Zealand
How to Access NEIC PDE Catalog
Go to http://www.ncedc.org/cnss/
Click on “Search the catalog”
Enter dates and/or time into the “Start date, time” and “End date, time” boxes
Enter in a magnitude range in the “Min magnitude” and “Max magnitude” boxes
Enter latitude and longitude range in the given boxes
Click “Submit request” button
How to Access the Global CMT Catalog
Go to http://www.globalcmt.org/
Scroll down to the section that is titled “Links to CMT resources:”
Click on “CMT catalog web search” link
Enter a starting year, month, and day into the “Starting Date:” table
In the “Ending Date:” table select the first row that has year, month, and day
Enter in an ending year, month, and day in the “Ending Date:” table
Under “Magnitude constraints:” type in a range of magnitudes in the two boxes after the title “Moment Magnitude”
Under “Location constraints:” enter in a range of latitude and longitude in the boxes after the “Latitude:” and “Longitude:” titles
Select Done
How to Access GNS Catalog
Go to http://magma.geonet.org.nz/resources/quakesearch/
Enter in desired time frame
Enter in desired latitude and longitude range
Enter in desired range of magnitude
Select “Submit”
Uses of Global CMT Catalog Information
Use the Global CMT site for focal mechanisms
The definition of a focal mechanism is: “The direction of slip in an earthquake and the orientation of the fault on which is occurs” (USGS)
Input focal mechanisms into SCEC-VDO format by:
Take information from the CMT search and put it into an excel spreadsheet
Look up information on longitude, latitude, depth, strike, dip, slip and magnitude
The columns on the spreadsheet should be Long, Lat, Depth, Strike, Dip, Slip, Magnitude (in that order)
Save the excel spreadsheet as a textfile
Uses of NEIC PDE and GNS Catalog Information
NEIC PDE used for global earthquake information
GNS used for New Zealand earthquake information
Generate lists of earthquakes in a specific area over a given amount of time
Copy the contents of the list of every earthquake
Paste it into notepad
Save the notepad document as a textfile
Import this text file by using the Earthquake Catalog plugin on SCEC VDO
Works Cited
Advanced National Seismic System. “ANSS: Composite Earthquake Catalog.” 25 July 2011. Web. 23 Sep. 2010. < http://www.ncedc.org/anss/ >.
Larson, Erik. “Global CMT Catalog Search.” 25 July 2011. Web. 26 Sept 2011. < http://www.globalcmt.org/CMTsearch.html
>.
GeoNet. Home. 3 Aug 2011. Web. 3 Aug 2011.
< http://www.geonet.org.nz/index.html
>.