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Geological Survey: Tremors in western suburbs likely from quarry blast, not … – Chicago Tribune



Geological Survey: Tremors in western suburbs likely from quarry blast, not … – Chicago Tribune


ABC7Chicago.com

Geological Survey: Tremors in western suburbs likely from quarry blast, not
Chicago Tribune
Blasting at a quarry sent tremors through the western suburbs shortly after noon today, causing buildings to shake and many people to believe they had been hit by an earthquake, officials said. The blasting was strong enough to register 3.2 on
earthquake? Quarry blast, 3.2 magnitude shakingABC7Chicago.com
Not An Earthquake: Quarry Blast Sparks Tremors In Chicago SuburbsNPR (blog)
Chicago Suburban earthquake or quarry blast? 1912 was first recordingChicagoNow (blog)
Chicago Sun-Times –WSIL TV –Chicago Daily Herald
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earthquake news – Google News



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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