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Moderate earthquake 5 mag, 68 km SSW of Chignik Lake, Alaska


Earthquake location 55.5351S, -158.8342WA moderate earthquake magnitude 5 (ml/mb) strikes 68 km SSW of Chignik Lake, Alaska (42 miles) on Thursday. The earthquake was roughly at a depth of 27.5 km (17 miles). Exact location, longitude -158.8342° West, latitude 55.5351° North, depth = 27.5 km. A tsunami warning has been issued near Chignik Lake in Alaska (Does not indicate if a tsunami actually did or will exist). Exact time and date of earthquake 23/02/18 / 2018-02-23 03:31:16 / February 23, 2018 @ 3:31 am UTC/GMT. Event id: ak18495894. Ids that are associated to the earthquake: at00p4l342, ak18495894, us2000d6s3. The temblor was reported at 18:31:16 / 6:31 pm (local time epicenter).

In the past 24 hours, there have been four, in the last 10 days four, in the past 30 days eight and in the last 365 days fourty-five earthquakes of magnitude 3.0 or greater that has struck near. Earthquakes 5.0 to 6.0 may cause light damage to buildings and other structures. Every year there are an estimated 1320 moderate earthquakes in the world.

Did you feel the quake?

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, Location, Distances, Seismometer information, Date-Time, Parameters and details about this quake, reported near: 68 km SSW of Chignik Lake, Alaska. This information comes from the USGS Earthquake Notification Service.

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More information

Parameter Value Description
Magnitude 5 mb The magnitude for the event.
Longitude -158.8342° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 55.5351° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 27.5 km Depth of the event in kilometers.
Place 68km SSW of Chignik Lake, Alaska Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2018-02-23 03:31:16 Time when the event occurred. UTC/GMT
Updated 2018-02-23 03:53:29 Time when the event was most recently updated. UTC/GMT
Timezone offset -540 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 4.02 The maximum estimated instrumental intensity for the event.
Alert Level green 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 385 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 ,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 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.88 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 ak18495894 Id of event.
Event Code 18495894 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,at00p4l342,ak18495894,us2000d6s3, A comma-separated list of event ids that are associated to an event.

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