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Light World Earthquakes Magnitude 4-4.9

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



Earthquake location -16.9769S, -173.9176WA light earthquake with magnitude 4.5 (ml/mb) was detected on Wednesday, 115 km S of Hihifo, Tonga (71 miles). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The temblor was detected at 02:22:05 / 2:22 am (local time epicenter). The earthquake occurred at a depth of 81.51 km (51 miles) below the earth’s surface. Exact location of event, longitude -173.9176 West, latitude -16.9769 South, depth = 81.51 km. Date and time of earthquake in UTC/GMT: 20/04/16 / 2016-04-20 14:22:05 / April 20, 2016 @ 2:22 pm. All ids that are associated to the event: us20005k6m. Unique identifier: us20005k6m.

Every 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 four, in the past 30 days seven and in the last 365 days fourty-seven earthquakes of magnitude 3.0 or greater that have been detected in the same area. 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. This information comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Date-Time, Location, Distances, Parameters and details about this quake, recorded: 115 km S of Hihifo, Tonga.

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More information

Parameter Value Description
Magnitude 4.5 mb The magnitude for the event.
Longitude -173.9176° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -16.9769° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 81.51 km Depth of the event in kilometers.
Place 115km S 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 2016-04-20 14:22:05 Time when the event occurred. UTC/GMT
Updated 2016-04-28 22:42:59 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 3.682 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 1.07 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 132 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 us20005k6m Id of event.
Event Code 20005k6m An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us20005k6m, A comma-separated list of event ids that are associated to an event.

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