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Light earthquake 4.2 mag, 5 km NNE of Big Lake, Alaska


Earthquake location 61.5447S, -149.9155WA light earthquake magnitude 4.2 (ml/mb) has occurred on Friday, 5 kilometers (3 miles) from Big Lake in Alaska. The earthquake occurred at a depth of 46.8 km (29 miles) below the earth’s surface. The temblor was picked up at 02:36:00 / 2:36 am (local time epicenter). Exact location of event, depth 46.8 km, -149.9155° West, 61.5447° North. A tsunami warning has been issued near Big Lake in Alaska (Does not indicate if a tsunami actually did or will exist). Id of earthquake: ak18839161. Event ids that are associated: ak18839161, at00p6eiw0. Global date and time of event UTC/GMT: 30/03/18 / 2018-03-30 11:36:00 / March 30, 2018 @ 11:36 am.

Earthquake epicenter was 36 km (23 miles) from Anchorage (c. 291 800 pop), 31 km (19 miles) from Eagle River (c. 24 800 pop), 17 km (11 miles) from Knik-Fairview (c. 14 900 pop), 33 km (20 miles) from Lakes (c. 8 400 pop), 27 km (17 miles) from Tanaina (c. 8 200 pop), 26 km (16 miles) from Wasilla (c. 7 800 pop). Closest city/cities/towns to epicentrum/hypocenter was Palmer, Anchorage, Gateway (min 5000 pop). Country/countries that might be effected, United States (c. 310 233 000 pop).

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 sixty-two earthquakes of magnitude 3.0 or greater that has occurred nearby. 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.

Questions or comments?

How did you react? Was there any damage to buildings? Leave a comment or report about shaking, activity and damage at your home, city and country. Read more about the earthquake, Location, Distances, Seismometer information, Date-Time, Parameters and details about this quake, reported near: 5 km NNE of Big Lake, Alaska. This information comes from the USGS Earthquake Notification Service.

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More information

Parameter Value Description
Magnitude 4.2 mb The magnitude for the event.
Longitude -149.9155° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 61.5447° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 46.8 km Depth of the event in kilometers.
Place 5km NNE 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 2018-03-30 11:36:00 Time when the event occurred. UTC/GMT
Updated 2018-03-30 11:38:49 Time when the event was most recently updated. UTC/GMT
Timezone offset -540 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 automatic 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 271 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,at, 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 0.37 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 ak18839161 Id of event.
Event Code 18839161 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,ak18839161,at00p6eiw0, A comma-separated list of event ids that are associated to an event.

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