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Light World Earthquakes Magnitude 4-4.9

Light earthquake, 4 mag has occurred near Semisopochnoi Island in Alaska

Posted by admin on August 30, 2017 0 Comments

Earthquake location 52.0151S, 179.1076WA light earthquake magnitude 4 (ml/mb) has struck on Sunday, 34 km WNW of Semisopochnoi Island, Alaska (21 miles). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The temblor was reported at 09:48:11 / 9:48 am (local time epicenter). The earthquake occurred at a depth of 168.1 km (104 miles). Exact time and date of earthquake 12/08/17 / 2017-08-12 21:48:11 / August 12, 2017 @ 9:48 pm UTC/GMT. Exact location of earthquake, longitude 179.1076 East, latitude 52.0151 North, depth = 168.1 km. Event id: us2000ad18. Ids that are associated to the earthquake: ak16507954, us2000ad18.

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

Questions or comments?

Did objects rattle, topple over, or fall off shelves? Leave a comment or report about activity, shaking and damage at your home, country and city. 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: 34 km WNW of Semisopochnoi Island, Alaska.

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More information

Parameter Value Description
Magnitude 4 mb The magnitude for the event.
Longitude 179.1076° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 52.0151° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 168.1 km Depth of the event in kilometers.
Place 34km WNW of Semisopochnoi 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 2017-08-12 21:48:11 Time when the event occurred. UTC/GMT
Updated 2017-08-30 01:48:43 Time when the event was most recently updated. UTC/GMT
Timezone offset 720 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 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 ,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 0.243 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.33 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 110 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 us2000ad18 Id of event.
Event Code 2000ad18 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,ak16507954,us2000ad18, A comma-separated list of event ids that are associated to an event.

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