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Minor earthquake, 3.1 mag strikes near Big Lake in Alaska


Earthquake location 61.3886S, -150.0653WA minor earthquake magnitude 3.1 (ml/mb) has struck on Tuesday, 15 kilometers (9 miles) from Big Lake in Alaska. The epicenter was at a depth of 32.5 km (20 miles). Date and time of earthquake in UTC/GMT: 04/12/18 / 2018-12-04 22:48:48 / December 4, 2018 @ 10:48 pm. Exact location of earthquake, longitude -150.0653 West, latitude 61.3886 North, depth = 32.5 km. All ids that are associated to the event: ak20443030. Unique identifier: ak20443030. The temblor was picked up at 13:48:48 / 1:48 pm (local time epicenter).

Epicenter of the earthquake was 21 km (13 miles) from Anchorage (c. 291 800 pop), 28 km (17 miles) from Eagle River (c. 24 800 pop), 28 km (18 miles) from Knik-Fairview (c. 14 900 pop), 47 km (29 miles) from Lakes (c. 8 400 pop), 43 km (27 miles) from Tanaina (c. 8 200 pop). Nearby country/countries, United States (c. 310 233 000 pop) (That might be effected). Nearest cities/city/towns to hypocenter/epicentrum was Palmer, Gateway, Lakes (min 5000 pop).

Earthquakes 2.5 to 3.5 are often felt, but only causes minor damage. In the past 24 hours, there have been thirteen, in the last 10 days two hundred and thirteen, in the past 30 days two hundred and fifteen and in the last 365 days two hundred and seventy earthquakes of magnitude 3.0 or greater that has struck near. There are an estimated 130,000 minor earthquakes in the world each year.

How would you describe the shaking?

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: 15 km SSW of Big Lake, Alaska.

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More information

Parameter Value Description
Magnitude 3.1 mb The magnitude for the event.
Longitude -150.0653° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 61.3886° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 32.5 km Depth of the event in kilometers.
Place 15km SSW of Big Lake, Alaska Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2018-12-04 22:48:48 Time when the event occurred. UTC/GMT
Updated 2018-12-04 23:02:15 Time when the event was most recently updated. UTC/GMT
Timezone offset -540 Timezone offset from UTC in minutes at the event epicenter.
Felt 0 The total number of felt reports
CDI 1 The maximum reported intensity for the event.
MMI 2.21 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 0.65 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 ak20443030 Id of event.
Event Code 20443030 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,ak20443030, A comma-separated list of event ids that are associated to an event.

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