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Light earthquake, 4.1 mag was detected near Willow in Alaska


Earthquake location 61.659S, -150.407WA light earthquake with magnitude 4.1 (ml/mb) was detected on Thursday, 21 kilometers (13 miles) from Willow in Alaska. The earthquake occurred at a depth of 44 km (27 miles). All ids that are associated to the event: at00oao4k4. Unique identifier: at00oao4k4. Exact time and date of event in UTC/GMT: 21/07/16 / 2016-07-21 14:07:16 / July 21, 2016 @ 2:07 pm. The temblor was detected at 06:07:16 / 6:07 am (local time epicenter). A tsunami warning has been issued near Willow in Alaska (Does not indicate if a tsunami actually did or will exist). Exact location, longitude -150.407° West, latitude 61.659° North, depth = 44 km.

Earthquake epicenter was 56 km (35 miles) from Anchorage (c. 291 800 pop), 58 km (36 miles) from Eagle River (c. 24 800 pop), 46 km (28 miles) from Knik-Fairview (c. 14 900 pop), 58 km (36 miles) from Lakes (c. 8 400 pop), 52 km (32 miles) from Tanaina (c. 8 200 pop), 52 km (32 miles) from Wasilla (c. 7 800 pop). Closest city/cities/towns to epicentrum/hypocenter was Palmer, Gateway, Elmendorf Air Force Base (min 5000 pop). Close country/countries that might be effected, United States (c. 310 233 000 pop).

Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage. There are an estimated 13,000 light earthquakes in the world each year. In the past 24 hours, there have been one, in the last 10 days two, in the past 30 days four and in the last 365 days seventy-eight earthquakes of magnitude 3.0 or greater that have been detected in the same area.

Did you feel anything?

What was your situation during the earthquake? Leave a comment or report about damage, shaking and activity at your home, city and country. This information comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Date-Time, Location, Distances, Parameters and details about this quake, recorded: 21 km WSW of Willow, Alaska.

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More information

Parameter Value Description
Magnitude 4.1 mb The magnitude for the event.
Longitude -150.407° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 61.659° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 44 km Depth of the event in kilometers.
Place 21km WSW of Willow, Alaska Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2016-07-21 14:07:16 Time when the event occurred. UTC/GMT
Updated 2016-07-21 14:10:50 Time when the event was most recently updated. UTC/GMT
Timezone offset -480 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 REVIEWED Indicates whether the event has been reviewed by a human.
Tsunami 1 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 259 A number describing how significant the event is. Larger numbers indicate a more significant event.
Network at The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources ,at, A comma-separated list of network contributors.
Number of Stations Used 60 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 0.1661883 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.84 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 46.799996256 The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type Ml The method or algorithm used to calculate the preferred magnitude for the event.
Event Type earthquake Type of seismic event.
Event ID at00oao4k4 Id of event.
Event Code 00oao4k4 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,at00oao4k4, A comma-separated list of event ids that are associated to an event.

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