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Minor World Earthquakes Magnitude -3.9

Minor earthquake: M3.5 quake has struck near Unalaska in Alaska

Earthquake location 53.0636S, -166.8099WA minor earthquake with magnitude 3.5 (ml/mb) was detected on Sunday, 91 km SSW of Unalaska, Alaska (57 miles). Exact location of earthquake, -166.8099° West, 53.0636° North, depth 35.03 km. The temblor was picked up at 01:22:19 / 1:22 am (local time epicenter). Exact time and date of earthquake 20/09/15 / 2015-09-20 12:22:19 / September 20, 2015 @ 12:22 pm UTC/GMT. The epicenter was at a depth of 35.03 km (22 miles). Unique identifier: us10003ijw. Ids that are associated to the event: ak11716076, us10003ijw.

Earthquakes 3.0 to 4.0 are often felt, but only causes minor damage. In the past 24 hours, there have been four, in the last 10 days five, in the past 30 days eight and in the last 365 days sixty-six earthquakes of magnitude 3.0 or greater that have been detected nearby. Each year there are an estimated 130,000 minor quakes in the world.

Did you feel anything?

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: 91 km SSW of Unalaska, Alaska.

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More information

Parameter Value Description
Magnitude 3.5 mb The magnitude for the event.
Longitude -166.8099° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 53.0636° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 35.03 km Depth of the event in kilometers.
Place 91km 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 2015-09-20 12:22:19 Time when the event occurred. UTC/GMT
Updated 2015-10-09 06:07:06 Time when the event was most recently updated. UTC/GMT
Timezone offset -660 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 188 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 0.732 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 1.12 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 206 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 us10003ijw Id of event.
Event Code 10003ijw An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,ak11716076,us10003ijw, A comma-separated list of event ids that are associated to an event.

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