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Minor earthquake 3.1 mag, 7 km WNW of Knik-Fairview, Alaska



Earthquake location 61.5337S, -149.7406WA minor earthquake magnitude 3.1 (ml/mb) has struck on Monday, 7 kilometers (4 miles) from Knik-Fairview in Alaska. The earthquake occurred at a depth of 17.3 km (11 miles). Date and time of earthquake in UTC/GMT: 18/04/17 / 2017-04-18 07:20:41 / April 18, 2017 @ 7:20 am. Exact location of event, longitude -149.7406 West, latitude 61.5337 North, depth = 17.3 km. Unique identifier: ak15781332. Ids that are associated to the event: ak15781332. The 3.1-magnitude earthquake has occurred at 22:20:41 / 10:20 pm (local time epicenter).

Country/countries that might be effected, United States (c. 310 233 000 pop). Closest city/cities or villages, with min 5000 pop, to hypocenter/epicentrum was Anchorage, Palmer, Elmendorf Air Force Base. Event epicenter was 36 km (22 miles) from Anchorage (c. 291 800 pop), 25 km (16 miles) from Eagle River (c. 24 800 pop), 8 km (5 miles) from Knik-Fairview (c. 14 900 pop), 24 km (15 miles) from Lakes (c. 8 400 pop), 20 km (12 miles) from Tanaina (c. 8 200 pop).

Each year there are an estimated 130,000 minor quakes in the world. In the past 24 hours, there have been one, in the last 10 days two, in the past 30 days five and in the last 365 days seventy-seven earthquakes of magnitude 3.0 or greater that has occurred nearby. Earthquakes 2.5 to 3.5 are often felt, but only causes minor damage.

Questions or comments?

What was your situation during the earthquake? Leave a comment or report about damage, shaking and activity at your home, city and country. The information in this article comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Distances, Parameters, Date-Time, Location and details about this quake, detected near: 7 km WNW of Knik-Fairview, Alaska.

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More information

Parameter Value Description
Magnitude 3.1 mb The magnitude for the event.
Longitude -149.7406° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 61.5337° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 17.3 km Depth of the event in kilometers.
Place 7km WNW of Knik-Fairview, Alaska Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2017-04-18 07:20:41 Time when the event occurred. UTC/GMT
Updated 2017-04-18 07:29:10 Time when the event was most recently updated. UTC/GMT
Timezone offset -540 Timezone offset from UTC in minutes at the event epicenter.
Felt 1 The total number of felt reports
CDI 2.2 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 automatic Indicates whether the event has been reviewed by a human.
Tsunami 0 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 148 A number describing how significant the event is. Larger numbers indicate a more significant event.
Network ak The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources ,ak, 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 0.89 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 ml The method or algorithm used to calculate the preferred magnitude for the event.
Event Type earthquake Type of seismic event.
Event ID ak15781332 Id of event.
Event Code 15781332 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,ak15781332, A comma-separated list of event ids that are associated to an event.

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