Light earthquake 4.5 mag, 144 km SW of Vaini, Tonga

A light earthquake with magnitude 4.5 (ml/mb) was reported 144 km SW of Vaini, Tonga (89 miles) on Wednesday. Exact location of event, depth 73.98 km, -175.9958° West, -22.2675° South. The earthquake occurred at a depth of 73.98 km (46 miles) below the earth’s surface. All ids that are associated to the event: us10004e50. Unique identifier: us10004e50. Exact time and date of earthquake 07/01/16 / 2016-01-07 00:31:43 / January 7, 2016 @ 12:31 am UTC/GMT. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The temblor was detected at 12:31:43 / 12:31 pm (local time epicenter).

There are an estimated 13,000 light earthquakes in the world each year. In the past 24 hours, there have been four, in the last 10 days five, in the past 30 days five and in the last 365 days eighteen earthquakes of magnitude 3.0 or greater that was reported nearby. Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage.

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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. 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: 144 km SW of Vaini, Tonga.

Tonga Vaini

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Parameter	Value	Description
Magnitude	4.5 mb	The magnitude for the event.
Longitude	-175.9958° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	-22.2675° South	Decimal degrees latitude. Negative values for southern latitudes.
Depth	73.98 km	Depth of the event in kilometers.
Place	144km SW of Vaini, Tonga	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2016-01-07 00:31:43	Time when the event occurred. UTC/GMT
Updated	2016-02-05 01:04:45	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	312	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	6.508	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	1.21 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	124	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	us10004e50	Id of event.
Event Code	10004e50	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,us10004e50,	A comma-separated list of event ids that are associated to an event.

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Light earthquake 4.5 mag, 144 km SW of Vaini, Tonga

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