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Moderate earthquake, 5.3 mag strikes near Semisopochnoi Island in Alaska



Earthquake location 51.2573S, 179.0809WA moderate earthquake magnitude 5.3 (ml/mb) strikes 85 km SSW of Semisopochnoi Island, Alaska (53 miles) on Wednesday. Event id: us20008sd8. Ids that are associated to the earthquake: at00omvncq, ak15501473, us20008sd8. A tsunami warning has been issued near Semisopochnoi Island in Alaska (Does not indicate if a tsunami actually did or will exist). Date and time of earthquake in UTC/GMT: 15/03/17 / 2017-03-15 22:19:43 / March 15, 2017 @ 10:19 pm. The 5.3-magnitude earthquake was detected at 12:19:43 / 12:19 pm (local time epicenter). The epicenter of the earthquake was roughly 30.92 km (19 miles) below the earth’s surface. Exact location, longitude 179.0809° East, latitude 51.2573° North, depth = 30.92 km.

In the past 24 hours, there have been two, in the last 10 days five, in the past 30 days eight and in the last 365 days one hundred and fourty-eight earthquakes of magnitude 3.0 or greater that have been detected nearby. Each year there are an estimated 1320 moderate quakes in the world. Earthquakes 5.0 to 6.0 may cause light damage to buildings and other structures.

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: 85 km SSW of Semisopochnoi Island, Alaska.

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More information

Parameter Value Description
Magnitude 5.3 mb The magnitude for the event.
Longitude 179.0809° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 51.2573° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 30.92 km Depth of the event in kilometers.
Place 85km 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 2017-03-15 22:19:43 Time when the event occurred. UTC/GMT
Updated 2017-03-15 22:35:09 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 1 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 432 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 ,at,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 0.182 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 1.23 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 71 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 us20008sd8 Id of event.
Event Code 20008sd8 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,at00omvncq,ak15501473,us20008sd8, A comma-separated list of event ids that are associated to an event.

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