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Minor earthquake: M2.8 quake has struck near Semisopochnoi Island in Alaska


Earthquake location 52.0763S, 179.7596WA minor earthquake magnitude 2.8 (ml/mb) strikes 17 km NE of Semisopochnoi Island, Alaska (11 miles) on Thursday. All ids that are associated to the event: ak12280173. Unique identifier: ak12280173. Global time and date of event 04/12/15 / 2015-12-04 00:05:45 / December 4, 2015 @ 12:05 am UTC/GMT. The epicenter of the earthquake was roughly 184.4 km (115 miles) below the earth’s surface. Exact location of event, depth 184.4 km, 179.7596° East, 52.0763° North. The temblor was picked up at 14:05:45 / 2:05 pm (local time epicenter).

In the past 24 hours, there have been three, in the last 10 days seven, in the past 30 days ten and in the last 365 days one hundred and ten earthquakes of magnitude 3.0 or greater that have been detected in the same area. Each year there are an estimated 1,300,000 minor earthquakes in the world. Earthquakes 2.5 to 2.9 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. Read more about the earthquake, Distances, Seismometer information, Date-Time, Parameters, Location and details about this quake, that has struck: 17 km NE of Semisopochnoi Island, Alaska. This data comes from the USGS Earthquake Notification Service.

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More information

Parameter Value Description
Magnitude 2.8 mb The magnitude for the event.
Longitude 179.7596° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 52.0763° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 184.4 km Depth of the event in kilometers.
Place 17km NE of Semisopochnoi 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 2015-12-04 00:05:45 Time when the event occurred. UTC/GMT
Updated 2015-12-14 22:21:38 Time when the event was most recently updated. UTC/GMT
Timezone offset -600 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 121 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, 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 0.47 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 ak12280173 Id of event.
Event Code 12280173 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,ak12280173, A comma-separated list of event ids that are associated to an event.

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