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Enhanced Real-time Earthquake Information Now Online


Enhanced Real-time Earthquake Information Now Online

New U.S. Geological Survey webpages featuring more robust, real-time earthquake information are now available.  Whether the earthquake is minor or major, earthquake.usgs.gov visitors will see a unique, interactive earthquake map that regularly updates, can be individually tailored, and provides saved settings for future map visits. 

In 2011, the website logged almost 48 million unique visitors and nearly 468 million pageviews. 

“For all citizens of ‘Earthquake Country,’ whether they reside in our Nation’s Capital or near a major global tectonic plate boundary, the new USGS earthquake webpages supply increased functionality to provide more real-time information tailored to the viewer’s specific needs,” said USGS Director Marcia McNutt. “When the ground shakes and time is of the essence, our goal is to ensure that the most timely information is at the fingertips of those who need to know.” 

From the website, users can access Latest Earthquakes  to zoom into and pan the world map to select different basemaps, as well as overlays such as plate boundaries, faults, and earthquake hazards. Information can be fine-tuned to display earthquakes on the map by time window, magnitude, depth, and maximum recorded intensity.  A list below the map updates for the current map view and settings and is sortable by any data column. Users can also download earthquake lists into other map interfaces like GoogleEarth (KML format) and Excel (CSV). 

The event page when an earthquake is selected has also been upgraded and it provides interactive features and more information, including downloadable data files in various formats for each earthquake product, such as ShakeMap, Did You Feel It?, etc. This new event-centric view allows the visitor to see all the information associated with each earthquake without having to jump around the website to view each related product. 

A future product in development will utilize the same user interface to search a comprehensive earthquake catalog populated with all existing USGS earthquake data, presenting a seamless view of recorded world-wide earthquakes current and historic.  It is anticipated that this product will be released in beta later this year.

USGS Newsroom


More information

Parameter Value Description
Magnitude mb The magnitude for the event.
Longitude ° East Decimal degrees longitude. Negative values for western longitudes.
Latitude ° North Decimal degrees latitude. Negative values for southern latitudes.
Depth km Depth of the event in kilometers.
Place Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 1970-01-01 00:00:00 Time when the event occurred. UTC/GMT
Updated 1970-01-01 00:00:00 Time when the event was most recently updated. UTC/GMT
Timezone offset Timezone offset from UTC in minutes at the event epicenter.
Felt The total number of felt reports
CDI The maximum reported intensity for the event.
MMI The maximum estimated instrumental intensity for the event.
Alert Level The alert level from the PAGER earthquake impact scale. Green, Yellow, Orange or Red.
Review Status Indicates whether the event has been reviewed by a human.
Tsunami This flag is set to "1" for large events in oceanic regions and "0" otherwise. The existence or value of this flag does not indicate if a tsunami actually did or will exist.
SIG A number describing how significant the event is. Larger numbers indicate a more significant event.
Network The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources A comma-separated list of network contributors.
Number of Stations Used The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type The method or algorithm used to calculate the preferred magnitude for the event.
Event Type Type of seismic event.
Event ID Id of event.
Event Code An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS A comma-separated list of event ids that are associated to an event.

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