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Light World Earthquakes Magnitude 4-4.9

Light earthquake, 4.5 mag strikes near Hihifo in Tonga


Earthquake location -15.6469S, -174.1908WA light earthquake magnitude 4.5 (ml/mb) has struck on Monday, 57 kilometers (35 miles) from Hihifo in Tonga. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Event id: us20005c8w. Ids that are associated to the earthquake: us20005c8w. The 4.5-magnitude earthquake was detected at 09:50:50 / 9:50 am (local time epicenter). Exact location of event, depth 81.25 km, -174.1908° West, -15.6469° South. Exact time and date of event in UTC/GMT: 21/03/16 / 2016-03-21 21:50:50 / March 21, 2016 @ 9:50 pm. The earthquake was roughly at a depth of 81.25 km (50 miles).

Epicenter of the event was 54 km (34 miles) from Hihifo (c. 800 pop). Nearest city/cities or towns, with min 5000 pop, to epicentrum/hypocenter was Hihifo. 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 one, in the last 10 days one, in the past 30 days four and in the last 365 days fifty-four earthquakes of magnitude 3.0 or greater that have been detected nearby. There are an estimated 13,000 light quakes in the world each year.

How would you describe the shaking?

Were you asleep? Was it difficult to stand and/or walk? Leave a comment or report about shaking, activity and damage at your city, home and country. This data comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Distances, Parameters, Date-Time, Location and details about this quake, that has occurred near: 57 km NW of Hihifo, Tonga.

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More information

Parameter Value Description
Magnitude 4.5 mb The magnitude for the event.
Longitude -174.1908° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -15.6469° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 81.25 km Depth of the event in kilometers.
Place 57km NW 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 2016-03-21 21:50:50 Time when the event occurred. UTC/GMT
Updated 2016-03-29 23:22:02 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 2.904 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.93 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 77 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 us20005c8w Id of event.
Event Code 20005c8w An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us20005c8w, A comma-separated list of event ids that are associated to an event.

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