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Moderate earthquake, 5.5 mag has occurred near Semisopochnoi Island in Alaska

Posted by admin on June 21, 2017 0 Comments

Earthquake location 51.834S, 179.421WA moderate earthquake with magnitude 5.5 (ml/mb) was detected on Wednesday, 17 km SW of Semisopochnoi Island, Alaska (11 miles). Exact location of earthquake, 179.421° East, 51.834° North, depth 165 km. Exact time and date of earthquake 21/06/17 / 2017-06-21 19:20:26 / June 21, 2017 @ 7:20 pm UTC/GMT. A tsunami warning has been issued near Semisopochnoi Island in Alaska (Does not indicate if a tsunami actually did or will exist). Event id: at00orwwe2. Ids that are associated to the earthquake: at00orwwe2. The 5.5-magnitude earthquake was detected at 09:20:26 / 9:20 am (local time epicenter). The epicenter of the earthquake was roughly 165 km (103 miles) below the earth’s surface.

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

Questions or comments?

How did you react? Was there any damage to buildings? Leave a comment or report about shaking, activity and damage at your home, city 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: 17 km SW of Semisopochnoi Island, Alaska.

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More information

Parameter Value Description
Magnitude 5.5 mb The magnitude for the event.
Longitude 179.421° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 51.834° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 165 km Depth of the event in kilometers.
Place 17km SW 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 2017-06-21 19:20:26 Time when the event occurred. UTC/GMT
Updated 2017-06-21 19:26:17 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 465 A number describing how significant the event is. Larger numbers indicate a more significant event.
Network at The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources ,at, A comma-separated list of network contributors.
Number of Stations Used 58 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 0.4635307 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.64 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 107.99999136 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 at00orwwe2 Id of event.
Event Code 00orwwe2 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,at00orwwe2, A comma-separated list of event ids that are associated to an event.

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