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Light World Earthquakes Magnitude 4-4.9

Light earthquake 4.4 mag, 114 km WSW of Chirikof Island, Alaska



Earthquake location 55.2452S, -157.1285WA light earthquake magnitude 4.4 (ml/mb) has occurred on Saturday, 114 km WSW of Chirikof Island, Alaska (71 miles). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Unique identifier: us2000aizy. Ids that are associated to the event: ak16791201, us2000aizy. Exact location of event, depth 28.63 km, -157.1285° West, 55.2452° North. Global time and date of event 09/09/17 / 2017-09-09 19:22:47 / September 9, 2017 @ 7:22 pm UTC/GMT. The temblor was detected at 09:22:47 / 9:22 am (local time epicenter). The earthquake occurred at a depth of 28.63 km (18 miles) below the earth’s surface.

In the past 24 hours, there have been six, in the last 10 days six, in the past 30 days eight and in the last 365 days thirty-five earthquakes of magnitude 3.0 or greater that have been detected nearby. Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage. There are an estimated 13,000 light quakes in the world each year.

Questions or comments?

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 data comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Distances, Parameters, Date-Time, Location and details about this quake, that has occurred near: 114 km WSW of Chirikof Island, Alaska.

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More information

Parameter Value Description
Magnitude 4.4 mb The magnitude for the event.
Longitude -157.1285° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 55.2452° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 28.63 km Depth of the event in kilometers.
Place 114km WSW of Chirikof 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 2017-09-09 19:22:47 Time when the event occurred. UTC/GMT
Updated 2017-09-28 22:35:39 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 298 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 1.032 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.61 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 146 The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type mwr The method or algorithm used to calculate the preferred magnitude for the event.
Event Type earthquake Type of seismic event.
Event ID us2000aizy Id of event.
Event Code 2000aizy An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,ak16791201,us2000aizy, A comma-separated list of event ids that are associated to an event.

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