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 Time | Daylight Time |
| Newfoundland | UTC - 3 ½ hours | UTC - 2 ½ 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 |
Location
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
Depth is the distance below sea level in kilometers.
33 km is used as a default depth for earthquakes determined to be shallow, but whose depth is not satisfactorily determined by
the data. Default depths of 5 or 10 km are usually used in mid-continental areas and on mid-ocean ridges since earthquakes in these
areas are usually shallower than 33 km.
Magnitude
Magnitude is a measure of the size of an earthquake or strain energy released by it, as determined by seismographic observations.
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Region
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.
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Reference
The distance and direction from a nearby geographical point to the earthquake location.
Source
The organization contributing the location.
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