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Light World Earthquakes Magnitude 4-4.9

Light earthquake: M4.5 quake has struck near Hihifo in Tonga


Earthquake location -15.1825S, -174.0713WA light earthquake with magnitude 4.5 (ml/mb) was reported 91 kilometers (57 miles) from Hihifo in Tonga on Saturday. Exact location of event, depth 10 km, -174.0713° West, -15.1825° South. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The 4.5-magnitude earthquake has occurred at 17:23:50 / 5:23 pm (local time epicenter). The earthquake occurred at a depth of 10 km (6 miles) below the earth’s surface. Date and time of earthquake in UTC/GMT: 18/12/16 / 2016-12-18 05:23:50 / December 18, 2016 @ 5:23 am. All ids that are associated to the event: us10007ptu. Unique identifier: us10007ptu.

Epicenter of the earthquake was 91 km (56 miles) from Hihifo (c. 800 pop). Nearby country/countries that might be effected, Tonga (c. 123 000 pop). Nearest cities/city/towns to hypocenter/epicentrum was Hihifo (min 5000 pop).

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

Did you feel it?

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. Read more about the earthquake, Location, Distances, Seismometer information, Date-Time, Parameters and details about this quake, reported near: 91 km NNW of Hihifo, Tonga. This information comes from the USGS Earthquake Notification Service.

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More information

Parameter Value Description
Magnitude 4.5 mb The magnitude for the event.
Longitude -174.0713° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -15.1825° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 10 km Depth of the event in kilometers.
Place 91km NNW 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 2016-12-18 05:23:50 Time when the event occurred. UTC/GMT
Updated 2017-01-15 14:01:55 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 2.556 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.85 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 155 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 us10007ptu Id of event.
Event Code 10007ptu An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us10007ptu, A comma-separated list of event ids that are associated to an event.

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