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Light World Earthquakes Magnitude 4-4.9

Light earthquake 4.3 mag, 94 km SSW of Hihifo, Tonga


Earthquake location -16.7858S, -173.9492WA light earthquake magnitude 4.3 (ml/mb) has occurred on Friday, 94 km SSW of Hihifo, Tonga (58 miles). The epicenter of the earthquake was roughly 123.53 km (77 miles) below the earth’s surface. Global date and time of event UTC/GMT: 20/11/15 / 2015-11-20 21:00:33 / November 20, 2015 @ 9:00 pm. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Unique identifier: us100040su. Ids that are associated to the event: us100040su. Exact location of earthquake, -173.9492° West, -16.7858° South, depth 123.53 km. The temblor was detected at 09:00:33 / 9:00 am (local time epicenter).

Each year there are an estimated 13,000 light earthquakes in the world. 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 thirty 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.

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. 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: 94 km SSW of Hihifo, Tonga.

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More information

Parameter Value Description
Magnitude 4.3 mb The magnitude for the event.
Longitude -173.9492° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -16.7858° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 123.53 km Depth of the event in kilometers.
Place 94km SSW 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 2015-11-20 21:00:33 Time when the event occurred. UTC/GMT
Updated 2015-12-07 23:22:39 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 284 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 3.545 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.54 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 85 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 us100040su Id of event.
Event Code 100040su An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us100040su, A comma-separated list of event ids that are associated to an event.

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