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Light World Earthquakes Magnitude 4-4.9

Light earthquake: M4.4 quake has struck near Nuku`alofa in Tonga


Earthquake location -19.3845S, -176.6633WA light earthquake magnitude 4.4 (ml/mb) has occurred on Thursday, 246 km NW of Nuku`alofa, Tonga (153 miles). The earthquake occurred at a depth of 587.37 km (365 miles). Global date and time of event UTC/GMT: 13/10/17 / 2017-10-13 00:56:40 / October 13, 2017 @ 12:56 am. The temblor was reported at 12:56:40 / 12:56 pm (local time epicenter). Event ids that are associated to the earthquake: us1000auk9. Id of event: us1000auk9. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Exact location of event, longitude -176.6633 West, latitude -19.3845 South, depth = 587.37 km.

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

Questions or comments?

What was your situation during the earthquake? Leave a comment or report about damage, shaking and activity at your home, city and country. Read more about the earthquake, Distances, Seismometer information, Date-Time, Parameters, Location and details about this quake, that has struck: 246 km NW of Nuku`alofa, Tonga. This data comes from the USGS Earthquake Notification Service.

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More information

Parameter Value Description
Magnitude 4.4 mb The magnitude for the event.
Longitude -176.6633° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -19.3845° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 587.37 km Depth of the event in kilometers.
Place 246km NW of Nuku`alofa, Tonga Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2017-10-13 00:56:40 Time when the event occurred. UTC/GMT
Updated 2017-10-29 01:05:49 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 298 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 5.27 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.42 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 us1000auk9 Id of event.
Event Code 1000auk9 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us1000auk9, A comma-separated list of event ids that are associated to an event.

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