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Light World Earthquakes Magnitude 4-4.9

Light earthquake 4.5 mag, 100 km NE of Neiafu, Tonga


Earthquake location -17.9431S, -173.3925WA light earthquake with magnitude 4.5 (ml/mb) was reported 100 km NE of Neiafu, Tonga (62 miles) on Thursday. The earthquake occurred at a depth of 35 km (22 miles). The temblor was detected at 11:03:51 / 11:03 am (local time epicenter). Exact location of earthquake, longitude -173.3925 West, latitude -17.9431 South, depth = 35 km. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Exact time and date of earthquake 30/11/17 / 2017-11-30 23:03:51 / November 30, 2017 @ 11:03 pm UTC/GMT. Unique identifier: us2000c1nj. Ids that are associated to the event: us2000c1nj.

There are an estimated 13,000 light earthquakes in the world each year. In the past 24 hours, there have been one, in the last 10 days one, in the past 30 days two and in the last 365 days twenty-five 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.

Did you feel the quake?

What was your situation during the earthquake? Leave a comment or report about damage, shaking and activity at your home, city and country. 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: 100 km NE of Neiafu, Tonga.

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More information

Parameter Value Description
Magnitude 4.5 mb The magnitude for the event.
Longitude -173.3925° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -17.9431° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 35 km Depth of the event in kilometers.
Place 100km NE of Neiafu, Tonga Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2017-11-30 23:03:51 Time when the event occurred. UTC/GMT
Updated 2017-12-09 06:29:40 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 4.301 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 1.25 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 107 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 us2000c1nj Id of event.
Event Code 2000c1nj An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us2000c1nj, A comma-separated list of event ids that are associated to an event.

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