Light earthquake, 4 mag strikes near Atka in Alaska

A light earthquake magnitude 4 (ml/mb) strikes 87 km SW of Atka, Alaska (54 miles) on Saturday. Event ids that are associated to the earthquake: us1000dsme. Id of event: us1000dsme. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Date and time of earthquake in UTC/GMT: 21/04/18 / 2018-04-21 22:30:53 / April 21, 2018 @ 10:30 pm. The earthquake occurred at a depth of 49.2 km (31 miles) below the earth’s surface. Exact location of earthquake, longitude -175.1789 West, latitude 51.6936 North, depth = 49.2 km. The temblor was picked up at 10:30:53 / 10:30 am (local time epicenter).

In the past 24 hours, there have been six, in the last 10 days eight, in the past 30 days thirteen and in the last 365 days one hundred and twenty-seven earthquakes of magnitude 3.0 or greater that was reported nearby. There are an estimated 13,000 light quakes in the world each year. Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage.

Did you feel the quake?

Were you asleep? Was it difficult to stand and/or walk? Leave a comment or report about shaking, activity and damage at your city, home 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: 87 km SW of Atka, Alaska.

Alaska Atka

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Parameter	Value	Description
Magnitude	4 mb	The magnitude for the event.
Longitude	-175.1789° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	51.6936° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	49.2 km	Depth of the event in kilometers.
Place	87km SW of Atka, Alaska	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2018-04-21 22:30:53	Time when the event occurred. UTC/GMT
Updated	2018-05-17 03:23:25	Time when the event was most recently updated. UTC/GMT
Timezone offset	-720	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	246	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	3.438	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.97 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	198	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	us1000dsme	Id of event.
Event Code	1000dsme	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,us1000dsme,	A comma-separated list of event ids that are associated to an event.

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Light earthquake, 4 mag strikes near Atka in Alaska

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