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Light World Earthquakes Magnitude 4-4.9

Light earthquake 4 mag, 33 km SSW of Semisopochnoi Island, Alaska

Earthquake location 51.6643S, 179.453WA light earthquake magnitude 4 (ml/mb) strikes 33 km SSW of Semisopochnoi Island, Alaska (21 miles) on Saturday. Global time and date of event 01/04/17 / 2017-04-01 08:55:03 / April 1, 2017 @ 8:55 am UTC/GMT. Exact location of event, longitude 179.453 East, latitude 51.6643 North, depth = 145.09 km. The 4-magnitude earthquake was detected at 20:55:03 / 8:55 pm (local time epicenter). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The earthquake was roughly at a depth of 145.09 km (90 miles). Unique identifier: us10008fbu. Ids that are associated to the event: ak15655854, us10008fbu.

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

How would you describe the shaking?

What was your situation during the earthquake? Leave a comment or report about damage, shaking and activity at your home, city and country. The information in this article comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Distances, Parameters, Date-Time, Location and details about this quake, detected near: 33 km SSW of Semisopochnoi Island, Alaska.

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More information

Parameter Value Description
Magnitude 4 mb The magnitude for the event.
Longitude 179.453° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 51.6643° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 145.09 km Depth of the event in kilometers.
Place 33km SSW 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 2017-04-01 08:55:03 Time when the event occurred. UTC/GMT
Updated 2017-04-20 05:32:31 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 ,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 2.117 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.98 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 206 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 us10008fbu Id of event.
Event Code 10008fbu An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,ak15655854,us10008fbu, A comma-separated list of event ids that are associated to an event.

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