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Light World Earthquakes Magnitude 4-4.9

Light earthquake, 4.1 mag has occurred near Amatignak Island in Alaska


Earthquake location 50.9893S, -178.4873WA light earthquake magnitude 4.1 (ml/mb) strikes 53 km SE of Amatignak Island, Alaska (33 miles) on Tuesday. Exact location, longitude -178.4873° West, latitude 50.9893° North, depth = 15.86 km. Unique identifier: us2000bv1b. Ids that are associated to the event: ak17366146, us2000bv1b. The 4.1-magnitude earthquake was detected at 09:06:57 / 9:06 am (local time epicenter). Exact time and date of event in UTC/GMT: 21/11/17 / 2017-11-21 21:06:57 / November 21, 2017 @ 9:06 pm. The earthquake was roughly at a depth of 15.86 km (10 miles). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist).

In the past 24 hours, there have been nine, in the last 10 days fifteen, in the past 30 days thirty and in the last 365 days seven hundred and fifty-four earthquakes of magnitude 3.0 or greater that have been detected in the same area. 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.

Questions or comments?

How did you respond? Did any furniture slide, topple over, or become displaced? Leave a comment or report about activity, shaking and damage at your home, city and country. This data comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Distances, Parameters, Date-Time, Location and details about this quake, that has occurred near: 53 km SE of Amatignak Island, Alaska.

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More information

Parameter Value Description
Magnitude 4.1 mb The magnitude for the event.
Longitude -178.4873° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 50.9893° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 15.86 km Depth of the event in kilometers.
Place 53km SE of Amatignak Island, Alaska Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2017-11-21 21:06:57 Time when the event occurred. UTC/GMT
Updated 2017-12-13 02:27:59 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 259 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 ,ak,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 0.793 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.71 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 223 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 us2000bv1b Id of event.
Event Code 2000bv1b An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,ak17366146,us2000bv1b, A comma-separated list of event ids that are associated to an event.

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