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Light World Earthquakes Magnitude 4-4.9

Light earthquake, 4.5 mag was detected near Neiafu in Tonga

Earthquake location -17.9915S, -173.8249WA light earthquake magnitude 4.5 (ml/mb) has occurred on Wednesday, 74 kilometers (46 miles) from Neiafu in Tonga. Exact location of event, depth 148.64 km, -173.8249° West, -17.9915° South. 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 148.64 km (92 miles). Event id: us1000j9fa. Ids that are associated to the earthquake: us1000j9fa. Global date and time of event UTC/GMT: 21/02/19 / 2019-02-21 06:48:09 / February 21, 2019 @ 6:48 am. The temblor was detected at 18:48:09 / 6:48 pm (local time epicenter).

Country/countries that might be effected, Tonga (c. 123 000 pop). Nearest city/cities or towns, with min 5000 pop, to epicentrum/hypocenter was Neiafu. Epicenter of the event was 75 km (47 miles) from Neiafu (c. 4 300 pop).

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

Did you feel the quake?

What was your situation during the earthquake? Leave a comment or report about damage, shaking and activity 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: 74 km NNE of Neiafu, Tonga.

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More information

Parameter Value Description
Magnitude 4.5 mb The magnitude for the event.
Longitude -173.8249° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -17.9915° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 148.64 km Depth of the event in kilometers.
Place 74km 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 2019-02-21 06:48:09 Time when the event occurred. UTC/GMT
Updated 2019-03-15 07:57:55 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 3.852 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.55 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 98 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 us1000j9fa Id of event.
Event Code 1000j9fa An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us1000j9fa, A comma-separated list of event ids that are associated to an event.

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