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Light World Earthquakes Magnitude 4-4.9

Light earthquake: M4.5 quake has struck near Nuku`alofa in Tonga


Earthquake location -20.7359S, -175.0894WA light earthquake magnitude 4.5 (ml/mb) has occurred on Sunday, 45 kilometers (28 miles) from Nuku`alofa in Tonga. The 4.5-magnitude earthquake was detected at 07:35:16 / 7:35 am (local time epicenter). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The epicenter was at a depth of 116.43 km (72 miles). Exact time and date of earthquake 03/12/17 / 2017-12-03 19:35:16 / December 3, 2017 @ 7:35 pm UTC/GMT. Exact location of earthquake, -175.0894° West, -20.7359° South, depth 116.43 km. Event ids that are associated to the earthquake: us2000c23e. Id of event: us2000c23e.

Nearest cities/city/towns to hypocenter/epicentrum was ‘Ohonua, Nuku‘alofa (min 5000 pop). Close country/countries that might be effected, Tonga (c. 123 000 pop). Event epicenter was 46 km (29 miles) from Nuku‘alofa (c. 22 400 pop), 68 km (42 miles) from ‘Ohonua (c. 1 200 pop).

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 eighteen earthquakes of magnitude 3.0 or greater that have been detected in the same area. Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage. Each year there are an estimated 13,000 light quakes in the world.

Did you feel anything?

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. Read more about the earthquake, Distances, Seismometer information, Date-Time, Parameters, Location and details about this quake, that has struck: 45 km NNE of Nuku`alofa, Tonga. This data comes from the USGS Earthquake Notification Service.

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More information

Parameter Value Description
Magnitude 4.5 mb The magnitude for the event.
Longitude -175.0894° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -20.7359° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 116.43 km Depth of the event in kilometers.
Place 45km NNE of Nuku`alofa, Tonga Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2017-12-03 19:35:16 Time when the event occurred. UTC/GMT
Updated 2017-12-11 20:59:20 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 5.13 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.84 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 108 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 us2000c23e Id of event.
Event Code 2000c23e An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us2000c23e, A comma-separated list of event ids that are associated to an event.

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