Light earthquake, 4.8 mag has occurred near Havelu in Tonga

A light earthquake magnitude 4.8 (ml/mb) strikes 49 kilometers (30 miles) from Havelu in Tonga on Wednesday. Event id: us2000iv82. Ids that are associated to the earthquake: us2000iv82. Exact location of earthquake, longitude -175.6911 West, latitude -21.2086 South, depth = 117.21 km. Global time and date of event 20/12/18 / 2018-12-20 04:00:37 / December 20, 2018 @ 4:00 am UTC/GMT. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The temblor was reported at 16:00:37 / 4:00 pm (local time epicenter). The epicenter of the earthquake was roughly 117.21 km (73 miles) below the earth’s surface.

Nearest cities/city/towns to hypocenter/epicentrum was ‘Ohonua, Nuku‘alofa (min 5000 pop). Epicenter of the earthquake was 51 km (32 miles) from Nuku‘alofa (c. 22 400 pop), 78 km (48 miles) from ‘Ohonua (c. 1 200 pop). Country/countries that might be effected, Tonga (c. 123 000 pop).

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. In the past 24 hours, there have been one, in the last 10 days one, in the past 30 days three and in the last 365 days eleven earthquakes of magnitude 3.0 or greater that has struck near.

Questions or comments?

What was your situation during the earthquake? Leave a comment or report about damage, shaking and activity at your home, city and country. Read more about the earthquake, Location, Distances, Seismometer information, Date-Time, Parameters and details about this quake, reported near: 49 km W of Havelu, Tonga. This information comes from the USGS Earthquake Notification Service.

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Parameter	Value	Description
Magnitude	4.8 mb	The magnitude for the event.
Longitude	-175.6911° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	-21.2086° South	Decimal degrees latitude. Negative values for southern latitudes.
Depth	117.21 km	Depth of the event in kilometers.
Place	49km W of Havelu, Tonga	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2018-12-20 04:00:37	Time when the event occurred. UTC/GMT
Updated	2018-12-20 04:16:57	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	354	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	5.815	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.86 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	85	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	us2000iv82	Id of event.
Event Code	2000iv82	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,us2000iv82,	A comma-separated list of event ids that are associated to an event.

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Light earthquake, 4.8 mag has occurred near Havelu in Tonga

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