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Light World Earthquakes Magnitude 4-4.9

Light earthquake, 4.2 mag was detected near Attu Station in Alaska

Posted by admin on August 14, 2017 0 Comments

Earthquake location 53.9163S, 171.1234WA light earthquake magnitude 4.2 (ml/mb) strikes 181 km NW of Attu Station, Alaska (112 miles) on Saturday. Exact location of event, longitude 171.1234 East, latitude 53.9163 North, depth = 23.41 km. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Exact time and date of earthquake 21/07/17 / 2017-07-21 15:57:43 / July 21, 2017 @ 3:57 pm UTC/GMT. All ids that are associated to the event: us2000a1d5. Unique identifier: us2000a1d5. The temblor was detected at 02:57:43 / 2:57 am (local time epicenter). The earthquake was roughly at a depth of 23.41 km (15 miles).

Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage. In the past 24 hours, there have been ten, in the last 10 days twenty-six, in the past 30 days twenty-eight and in the last 365 days fourty-two earthquakes of magnitude 3.0 or greater that has struck near. Every year there are an estimated 13,000 light earthquakes in the world.

Did you feel it?

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. 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: 181 km NW of Attu Station, Alaska.

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More information

Parameter Value Description
Magnitude 4.2 mb The magnitude for the event.
Longitude 171.1234° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 53.9163° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 23.41 km Depth of the event in kilometers.
Place 181km NW of Attu Station, Alaska Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2017-07-21 15:57:43 Time when the event occurred. UTC/GMT
Updated 2017-08-14 14:16:09 Time when the event was most recently updated. UTC/GMT
Timezone offset 660 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 271 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, 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 2.145 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 1.47 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 mb The method or algorithm used to calculate the preferred magnitude for the event.
Event Type earthquake Type of seismic event.
Event ID us2000a1d5 Id of event.
Event Code 2000a1d5 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us2000a1d5, A comma-separated list of event ids that are associated to an event.

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