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Light World Earthquakes Magnitude 4-4.9

Light earthquake 4 mag, 91 km SSE of Little Sitkin Island, Alaska



Earthquake location 51.173S, 178.95WA light earthquake magnitude 4 (ml/mb) strikes 91 km SSE of Little Sitkin Island, Alaska (57 miles) on Monday. The earthquake occurred at a depth of 28.28 km (18 miles) below the earth’s surface. Event ids that are associated to the earthquake: us2000abni. Id of event: us2000abni. The temblor was reported at 23:46:44 / 11:46 pm (local time epicenter). Exact location of earthquake, longitude 178.95 East, latitude 51.173 North, depth = 28.28 km. Date and time of earthquake in UTC/GMT: 21/08/17 / 2017-08-21 11:46:44 / August 21, 2017 @ 11:46 am. 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 two, in the last 10 days four, in the past 30 days eleven and in the last 365 days one hundred and fifty-seven earthquakes of magnitude 3.0 or greater that was reported nearby. Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage. There are an estimated 13,000 light quakes in the world each year.

Did you feel anything?

What was your situation during the earthquake? Leave a comment or report about damage, shaking and activity at your home, city and country. Read more about the earthquake, Distances, Seismometer information, Date-Time, Parameters, Location and details about this quake, that has struck: 91 km SSE of Little Sitkin Island, Alaska. This data comes from the USGS Earthquake Notification Service.

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More information

Parameter Value Description
Magnitude 4 mb The magnitude for the event.
Longitude 178.95° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 51.173° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 28.28 km Depth of the event in kilometers.
Place 91km SSE of Little Sitkin 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 2017-08-21 11:46:44 Time when the event occurred. UTC/GMT
Updated 2017-09-01 06:42:07 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 0.3 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.86 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 226 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 us2000abni Id of event.
Event Code 2000abni An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us2000abni, A comma-separated list of event ids that are associated to an event.

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