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Light World Earthquakes Magnitude 4-4.9

Light earthquake, 4.5 mag strikes near Nuku`alofa in Tonga


Earthquake location -20.8594S, -175.4591WA light earthquake with magnitude 4.5 (ml/mb) was detected on Tuesday, 40 kilometers (25 miles) from Nuku`alofa in Tonga. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The temblor was picked up at 02:14:11 / 2:14 am (local time epicenter). Exact location of event, longitude -175.4591 West, latitude -20.8594 South, depth = 10 km. Exact time and date of earthquake 16/02/16 / 2016-02-16 14:14:11 / February 16, 2016 @ 2:14 pm UTC/GMT. Unique identifier: us10004r1i. Ids that are associated to the event: us10004r1i. The epicenter of the earthquake was roughly 10 km (6 miles) below the earth’s surface.

Close country/countries that might be effected, Tonga (c. 123 000 pop). Closest city/cities or villages, with min 5000 pop, to hypocenter/epicentrum was ‘Ohonua, Nuku‘alofa. Epicenter of the earthquake was 41 km (25 miles) from Nuku‘alofa (c. 22 400 pop), 75 km (46 miles) from ‘Ohonua (c. 1 200 pop).

There are an estimated 13,000 light quakes in the world each year. In the past 24 hours, there have been five, in the last 10 days six, in the past 30 days six and in the last 365 days twenty 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.

Questions or comments?

Did objects rattle, topple over, or fall off shelves? Leave a comment or report about activity, shaking and damage at your home, country and city. This information comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Date-Time, Location, Distances, Parameters and details about this quake, recorded: 40 km NW of Nuku`alofa, Tonga.

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More information

Parameter Value Description
Magnitude 4.5 mb The magnitude for the event.
Longitude -175.4591° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -20.8594° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 10 km Depth of the event in kilometers.
Place 40km NW 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 2016-02-16 14:14:11 Time when the event occurred. UTC/GMT
Updated 2016-03-14 14:19:02 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 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 5.497 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 1.17 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 119 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 us10004r1i Id of event.
Event Code 10004r1i An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us10004r1i, A comma-separated list of event ids that are associated to an event.

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