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Light World Earthquakes Magnitude 4-4.9

Light earthquake, 4.7 mag was detected near `Ohonua in Tonga


Earthquake location -21.7839S, -175.0171WA light earthquake magnitude 4.7 (ml/mb) has struck on Saturday, 50 kilometers (31 miles) from `Ohonua in Tonga. All ids that are associated to the event: us600085b2. Unique identifier: us600085b2. The temblor was detected at 09:05:13 / 9:05 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 35 km (22 miles). Exact location, longitude -175.0171° West, latitude -21.7839° South, depth = 35 km. Global date and time of event UTC/GMT: 22/02/20 / 2020-02-22 21:05:13 / February 22, 2020 @ 9:05 pm.

The epicenter was 74 km (46 miles) from Nuku‘alofa (c. 22 400 pop), 51 km (31 miles) from ‘Ohonua (c. 1 200 pop). Closest city/cities/towns to epicentrum/hypocenter was Nuku‘alofa, ‘Ohonua (min 5000 pop). Close country/countries that might be effected, Tonga (c. 123 000 pop).

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

How would you describe the shaking?

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. Read more about the earthquake, Location, Distances, Seismometer information, Date-Time, Parameters and details about this quake, reported near: 50 km S of `Ohonua, Tonga. This information comes from the USGS Earthquake Notification Service.

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More information

Parameter Value Description
Magnitude 4.7 mb The magnitude for the event.
Longitude -175.0171° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -21.7839° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 35 km Depth of the event in kilometers.
Place 50km S of `Ohonua, Tonga Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2020-02-22 21:05:13 Time when the event occurred. UTC/GMT
Updated 2020-03-14 02:05:47 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 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 14.202 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.78 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 93 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 us600085b2 Id of event.
Event Code 600085b2 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us600085b2, A comma-separated list of event ids that are associated to an event.

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