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Light earthquake: M4 quake strikes near Semisopochnoi Island in Alaska

Posted by admin on March 31, 2015 0 Comments

Earthquake location 50.9997S, 179.3075WA light earthquake magnitude 4 (mg/mb) has occurred on Wednesday, 107 kilometers (66 miles) from Semisopochnoi Island in Alaska. The temblor was reported at 06:19:26 / 6:19 am (local time epicenter) at a depth of 20.75 km (13 miles). Global time of event 31/03/15 / 2015-03-31 18:19:26 / March 31, 2015 @ 6:19 pm UTC/GMT. A tsunami warning has not been issued, according to the U.S. Geological Survey. Exact location of event, longitude 179.3075 East, latitude 50.9997 North, depth 20.75 km, unique identifier, us10001sfx.

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Leave a comment or report about shaking, activity and damage at your home, city and country. Read more about the earthquake, Seismometer information, Date-Time, Location, Distances, Parameters and details about this quake, recorded in: 107 km S of Semisopochnoi Island, Alaska.


More information

Parameter Value Description
Magnitude 4 mb The magnitude for the event.
Longitude 179.3075° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 50.9997° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 20.75 km Depth of the event in kilometers.
Place 107km S 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 2015-03-31 18:19:26 Time when the event occurred. UTC/GMT
Updated 2015-03-31 20:11:47 Time when the event was most recently updated. UTC/GMT
Timezone offset 720 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, 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 0.377 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 1.39 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 216 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 us10001sfx Id of event.
Event Code 10001sfx An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us10001sfx, A comma-separated list of event ids that are associated to an event.

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