Light earthquake: M4.9 quake has struck near Neiafu in Tonga

A light earthquake magnitude 4.9 (ml/mb) has occurred on Monday, 167 km NE of Neiafu, Tonga (104 miles). The earthquake was roughly at a depth of 10 km (6 miles). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The temblor was reported at 03:42:57 / 3:42 am (local time epicenter). Date and time of earthquake in UTC/GMT: 21/12/20 / 2020-12-21 03:42:57 / December 21, 2020 @ 3:42 am. Exact location of event, longitude -172.7491 West, latitude -17.7048 South, depth = 10 km. Event id: us7000cstt. Ids that are associated to the earthquake: us7000cstt.

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

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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. Read more about the earthquake, Distances, Seismometer information, Date-Time, Parameters, Location and details about this quake, that has struck: 167 km NE of Neiafu, Tonga. This data comes from the USGS Earthquake Notification Service.

Neiafu Tonga

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Parameter	Value	Description
Magnitude	4.9 mb	The magnitude for the event.
Longitude	-172.7491° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	-17.7048° South	Decimal degrees latitude. Negative values for southern latitudes.
Depth	10 km	Depth of the event in kilometers.
Place	167 km NE of Neiafu, Tonga	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2020-12-21 03:42:57	Time when the event occurred. UTC/GMT
Updated	2020-12-21 04:09:34	Time when the event was most recently updated. UTC/GMT
Timezone offset		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	369	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	3.887	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.97 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	97	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	us7000cstt	Id of event.
Event Code	7000cstt	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,us7000cstt,	A comma-separated list of event ids that are associated to an event.

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Light earthquake: M4.9 quake has struck near Neiafu in Tonga

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