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Light World Earthquakes Magnitude 4-4.9

Light earthquake 4 mag, 41 km SSW of Unalaska, Alaska


Earthquake location 53.5437S, -166.8378WA light earthquake magnitude 4 (ml/mb) has struck on Friday, 41 km SSW of Unalaska, Alaska (25 miles). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Exact location of event, longitude -166.8378 West, latitude 53.5437 North, depth = 79.83 km. The temblor was picked up at 14:11:41 / 2:11 pm (local time epicenter). Date and time of earthquake in UTC/GMT: 06/11/15 / 2015-11-06 23:11:41 / November 6, 2015 @ 11:11 pm. Event ids that are associated to the earthquake: us10003z4k, ak11781252. Id of event: us10003z4k. The epicenter of the earthquake was roughly 79.83 km (50 miles) below the earth’s surface.

In the past 24 hours, there have been three, in the last 10 days five, in the past 30 days nine and in the last 365 days sixty-nine earthquakes of magnitude 3.0 or greater that have been detected in the same area. 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.

Did you feel it?

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. 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: 41 km SSW of Unalaska, Alaska.

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More information

Parameter Value Description
Magnitude 4 mb The magnitude for the event.
Longitude -166.8378° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 53.5437° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 79.83 km Depth of the event in kilometers.
Place 41km SSW of Unalaska, Alaska Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2015-11-06 23:11:41 Time when the event occurred. UTC/GMT
Updated 2015-11-22 23:24:13 Time when the event was most recently updated. UTC/GMT
Timezone offset -540 Timezone offset from UTC in minutes at the event epicenter.
Felt 0 The total number of felt reports
CDI 1 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 ,us,ak, 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 0.251 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.83 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 164 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 us10003z4k Id of event.
Event Code 10003z4k An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us10003z4k,ak11781252, A comma-separated list of event ids that are associated to an event.

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