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Global Earthquake Alerts to Include Economic Loss and Casualty Information

Global Earthquake Alerts to Include Economic Loss and Casualty Information

Estimated economic loss and casualty information will now be included in earthquake alerts sent out by the U.S. Geological Survey (USGS) following significant earthquakes around the world. These earthquake alerts are widely recognized and used by emergency responders, government and aid officials, and the public to understand the scope of the potential disaster and to develop the best response.

The USGS automated system, PAGER (Prompt Assessment of Global Earthquakes for Response), rapidly assesses earthquake impacts by estimating the shaking distribution, the number of people and settlements exposed to severe shaking, and the range of possible fatalities and economic losses. The estimated losses trigger the appropriate color-coded alert, which determines levels of response: no response needed (green); local or regional (yellow), national (orange) or international (red).

“The two recent earthquakes in Haiti and Chile are good indications that earthquake magnitude alone is not a reliable predictor of human and economic loss,” said Dr. Marcia McNutt, director of the USGS. “The smaller magnitude-7.0 Haiti earthquake caused significantly more damage and loss of life than did the larger magnitude-8.8 Chile earthquake. PAGER is designed to rapidly and automatically take into account the differences in proximity to populated areas, depth of the earthquake, and building standards that are so critical in determining the human and economic toll so that emergency responders can act promptly and accordingly.”

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“The USAID Office of Foreign Disaster Assistance has utilized PAGER since its inception,” said Mark Ward, acting director of the USAID Office of Foreign Disaster Assistance. “When a big earthquake takes place outside of the U.S., the system helps us determine the appropriate scale for the initial U.S. government response quickly. The addition of economic loss and casualty estimates to the PAGER system will further improve our ability to mount the appropriate response quickly and save lives.”

PAGER results are generally available within 30 minutes of a significant earthquake, shortly after scientists determine the location and magnitude of the event. PAGER also provides important supplementary information, including comments describing the dominant types of vulnerable buildings in the region, fatality reports from previous nearby earthquakes, and a summary of regionally specific information concerning the potential for secondary hazards, such as earthquake-induced landslides, tsunamis and liquefaction.

PAGER results are available on the Earthquake Hazards Program website. Users who wish to receive customizable magnitude- and location-based earthquake alerts can sign up for the USGS Earthquake Notification Service.

View a fact sheet about PAGER and frequently asked questions are available online.

The USGS locates over 30,000 earthquakes a year. On average, 25 of these cause significant damage, injuries or fatalities.

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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