Link to USGS home page.
Earthquake Hazards Program


    Date - Time
    Coordinated Universal Time (UTC) is used for the origin time of the earthquake.

      In the United States, Canada or Mexico, to convert to your local time, find your time zone and subtract the number of hours listed.

       Standard TimeDaylight Time
      Newfoundland UTC - 3½ hours UTC - 2½ hours
      Atlantic UTC - 4 hours UTC - 3 hours
      Eastern UTC - 5 hours UTC - 4 hours
      Central UTC - 6 hours UTC - 5 hours
      Mountain UTC - 7 hours UTC - 6 hours
      Pacific UTC - 8 hours UTC - 7 hours
      Alaska UTC - 9 hours UTC - 8 hours
      Hawaii UTC - 10 hours 
      Aleutian UTC - 10 hours UTC - 9 hours

    The latitude and longitude of the earthquake are given in decimal degrees. The latitude is the number of degrees north (N) or south (S) of the equator. The longitude is the number of degrees east (E) or west (W) of the prime meridian, which runs through Greenwich, England.

    Depth is the distance below sea level in kilometers. If the depth of an event is not satisfactorily determined by the data, it is held to a default depth, and the Location Quality shows "depth fixed by location program."

    Magnitude is a measure of the size of an earthquake or strain energy released by it, as determined by seismographic observations. More->

    The region name is usually an automatically-generated name from the Flinn-Engdahl (F-E) seismic and geographical regionalization scheme. The boundaries of these regions are defined at one-degree intervals and therefore differ from irregular political boundaries. More->

    The distance and direction from a nearby geographical point to the earthquake location.

    The organization contributing the location.


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