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Light World Earthquakes Magnitude 4-4.9

Light earthquake, 4.2 mag strikes near Nikolski in Alaska


Earthquake location 52.0574S, -171.0083WA light earthquake magnitude 4.2 (ml/mb) has occurred on Monday, 175 km SW of Nikolski, Alaska (109 miles). Exact location of event, depth 41.2 km, -171.0083° West, 52.0574° North. Global date and time of event UTC/GMT: 07/12/20 / 2020-12-07 09:33:11 / December 7, 2020 @ 9:33 am. Event id: us7000cpuv. Ids that are associated to the earthquake: us7000cpuv. The temblor was reported at 09:33:11 / 9:33 am (local time epicenter). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The earthquake occurred at a depth of 41.2 km (26 miles) below the earth’s surface.

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

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. 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: 175 km SW of Nikolski, Alaska.

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More information

Parameter Value Description
Magnitude 4.2 mb The magnitude for the event.
Longitude -171.0083° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 52.0574° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 41.2 km Depth of the event in kilometers.
Place 175 km SW of Nikolski, Alaska Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2020-12-07 09:33:11 Time when the event occurred. UTC/GMT
Updated 2020-12-14 06:58:41 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 reviewed 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 271 A number describing how significant the event is. Larger numbers indicate a more significant event.
Network us The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources ,us, 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 1.026 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.66 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 139 The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type mb The method or algorithm used to calculate the preferred magnitude for the event.
Event Type earthquake Type of seismic event.
Event ID us7000cpuv Id of event.
Event Code 7000cpuv An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us7000cpuv, A comma-separated list of event ids that are associated to an event.

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