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Light World Earthquakes Magnitude 4-4.9

Light earthquake, 4.6 mag was detected near Hihifo in Tonga



Earthquake location -15.5987S, -173.7083WA light earthquake magnitude 4.6 (ml/mb) has struck on Saturday, 39 kilometers (24 miles) from Hihifo in Tonga. All ids that are associated to the event: us10008vhl. Unique identifier: us10008vhl. The earthquake occurred at a depth of 68.15 km (42 miles). Exact time and date of earthquake 21/05/17 / 2017-05-21 10:51:17 / May 21, 2017 @ 10:51 am UTC/GMT. Exact location of event, longitude -173.7083 West, latitude -15.5987 South, depth = 68.15 km. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The temblor was picked up at 22:51:17 / 10:51 pm (local time epicenter).

Country/countries that might be effected, Tonga (c. 123 000 pop). Nearest cities/city/towns to hypocenter/epicentrum was Hihifo (min 5000 pop). Event epicenter was 41 km (25 miles) from Hihifo (c. 800 pop).

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

Questions or comments?

How did you react? Was there any damage to buildings? Leave a comment or report about shaking, activity and damage at your home, city and country. The information in this article comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Distances, Parameters, Date-Time, Location and details about this quake, detected near: 39 km N of Hihifo, Tonga.

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More information

Parameter Value Description
Magnitude 4.6 mb The magnitude for the event.
Longitude -173.7083° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -15.5987° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 68.15 km Depth of the event in kilometers.
Place 39km N of Hihifo, Tonga Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2017-05-21 10:51:17 Time when the event occurred. UTC/GMT
Updated 2017-06-02 08:20:17 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 326 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 2.512 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.7 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 114 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 us10008vhl Id of event.
Event Code 10008vhl An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us10008vhl, A comma-separated list of event ids that are associated to an event.

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