Because we did not change the location procedure or velocity models, the new locations and magnitudes are nearly identical to the old locations.
Minor changes result from the new station coordinates and traveltime corrections.
Information on the change in location or magnitude for any earthquake is available upon request . The following discussion provides more detail on why we made the changes to the catalog and provides supporting documentation. For more information on the NCSN network and processing procedures, see Oppenheimer et. A new station name format was implemented because the old format did not uniquely define a station name and component. The new phase format based on the Universal format is quite similar to the old format, and most users are unlikely to be affected by this change.