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Light earthquake: M4.1 quake has struck near Semisopochnoi Island in Alaska


Earthquake location 52.1623S, -179.4485WA light earthquake magnitude 4.1 (ml/mb) has occurred on Tuesday, 69 km ENE of Semisopochnoi Island, Alaska (43 miles). Exact location of earthquake, longitude -179.4485 West, latitude 52.1623 North, depth = 241.9 km. Date and time of earthquake in UTC/GMT: 30/10/18 / 2018-10-30 13:18:05 / October 30, 2018 @ 1:18 pm. A tsunami warning has been issued near Semisopochnoi Island in Alaska (Does not indicate if a tsunami actually did or will exist). Id of earthquake: ak20304837. Event ids that are associated: at00pheya4, ak20304837. The temblor was picked up at 01:18:05 / 1:18 am (local time epicenter). The epicenter of the earthquake was roughly 241.9 km (150 miles) below the earth’s surface.

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

How would you describe the shaking?

What was your situation during the earthquake? Leave a comment or report about damage, shaking and activity 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: 69 km ENE of Semisopochnoi Island, Alaska.

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More information

Parameter Value Description
Magnitude 4.1 mb The magnitude for the event.
Longitude -179.4485° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 52.1623° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 241.9 km Depth of the event in kilometers.
Place 69km ENE 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 2018-10-30 13:18:05 Time when the event occurred. UTC/GMT
Updated 2018-10-30 13:47:44 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 1 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 259 A number describing how significant the event is. Larger numbers indicate a more significant event.
Network ak The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources ,at,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 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.43 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 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 ak20304837 Id of event.
Event Code 20304837 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,at00pheya4,ak20304837, A comma-separated list of event ids that are associated to an event.

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