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Light earthquake: M4.5 quake has struck near Vaini in Tonga

Posted by admin on January 26, 2016 0 Comments

Earthquake location -21.484S, -175.5137WA light earthquake magnitude 4.5 (ml/mb) strikes 45 kilometers (28 miles) from Vaini in Tonga on Monday. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Exact location of event, depth 35 km, -175.5137° West, -21.484° South. The epicenter of the earthquake was roughly 35 km (22 miles) below the earth’s surface. Global date and time of event UTC/GMT: 11/01/16 / 2016-01-11 22:44:37 / January 11, 2016 @ 10:44 pm. Event id: us10004exg. Ids that are associated to the earthquake: us10004exg. The 4.5-magnitude earthquake was detected at 10:44:37 / 10:44 am (local time epicenter).

Nearest cities/city/towns to hypocenter/epicentrum was ‘Ohonua, Nuku‘alofa (min 5000 pop). Epicenter of the event was 50 km (31 miles) from Nuku‘alofa (c. 22 400 pop), 61 km (38 miles) from ‘Ohonua (c. 1 200 pop). Nearby country/countries that might be effected, Tonga (c. 123 000 pop).

Each year there are an estimated 13,000 light earthquakes in the world. 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 two and in the last 365 days sixteen earthquakes of magnitude 3.0 or greater that has struck near.

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: 45 km SW of Vaini, Tonga.

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More information

Parameter Value Description
Magnitude 4.5 mb The magnitude for the event.
Longitude -175.5137° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -21.484° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 35 km Depth of the event in kilometers.
Place 45km 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 2016-01-11 22:44:37 Time when the event occurred. UTC/GMT
Updated 2016-01-26 01:42:39 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 7.113 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 262 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 us10004exg Id of event.
Event Code 10004exg An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us10004exg, A comma-separated list of event ids that are associated to an event.

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