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Light World Earthquakes Magnitude 4-4.9

Light earthquake, 4.7 mag was detected near Neiafu in Tonga

Posted by admin on December 29, 2018 0 Comments

Earthquake location -18.0755S, -173.8118WA light earthquake magnitude 4.7 (ml/mb) strikes 66 kilometers (41 miles) from Neiafu in Tonga on Sunday. Exact location, longitude -173.8118° West, latitude -18.0755° South, depth = 35.7 km. The 4.7-magnitude earthquake has occurred at 11:17:17 / 11:17 am (local time epicenter). The earthquake occurred at a depth of 35.7 km (22 miles). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Global date and time of event UTC/GMT: 16/12/18 / 2018-12-16 23:17:17 / December 16, 2018 @ 11:17 pm. Event id: us2000ivww. Ids that are associated to the earthquake: us2000ivww.

The epicenter was 66 km (41 miles) from Neiafu (c. 4 300 pop). Closest city/cities or villages, with min 5000 pop, to hypocenter/epicentrum was Neiafu. Country/countries that might be effected, Tonga (c. 123 000 pop).

Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage. In the past 24 hours, there have been three, in the last 10 days three, in the past 30 days five and in the last 365 days twenty-two earthquakes of magnitude 3.0 or greater that was reported nearby. Every year there are an estimated 13,000 light earthquakes in the world.

Questions or comments?

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. 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: 66 km NNE of Neiafu, Tonga.

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More information

Parameter Value Description
Magnitude 4.7 mb The magnitude for the event.
Longitude -173.8118° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -18.0755° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 35.7 km Depth of the event in kilometers.
Place 66km NNE 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 2018-12-16 23:17:17 Time when the event occurred. UTC/GMT
Updated 2018-12-29 22:55:27 Time when the event was most recently updated. UTC/GMT
Timezone offset -720 Timezone offset from UTC in minutes at the event epicenter.
Felt 1 The total number of felt reports
CDI 4.1 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 340 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 3.816 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.8 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 103 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 us2000ivww Id of event.
Event Code 2000ivww An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us2000ivww, A comma-separated list of event ids that are associated to an event.

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