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Light World Earthquakes Magnitude 4-4.9

Light earthquake: M4.6 quake has struck near Hihifo in Tonga


Earthquake location -16.3992S, -174.1472WA light earthquake with magnitude 4.6 (ml/mb) was reported 65 kilometers (40 miles) from Hihifo in Tonga on Monday. Exact location of earthquake, -174.1472° West, -16.3992° South, depth 59.9 km. The 4.6-magnitude earthquake was detected at 12:03:21 / 12:03 pm (local time epicenter). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Exact time and date of event in UTC/GMT: 30/10/18 / 2018-10-30 00:03:21 / October 30, 2018 @ 12:03 am. The earthquake occurred at a depth of 59.9 km (37 miles). Id of earthquake: us2000i7ji. Event ids that are associated: us2000i7ji.

Nearby country/countries, Tonga (c. 123 000 pop) (That might be effected). Closest city/cities/towns to epicentrum/hypocenter was Hihifo (min 5000 pop). Event epicenter was 62 km (39 miles) from Hihifo (c. 800 pop).

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

Did you feel anything?

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: 65 km SW of Hihifo, Tonga.

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More information

Parameter Value Description
Magnitude 4.6 mb The magnitude for the event.
Longitude -174.1472° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -16.3992° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 59.9 km Depth of the event in kilometers.
Place 65km SW 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 2018-10-30 00:03:21 Time when the event occurred. UTC/GMT
Updated 2018-11-18 00:36:16 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 326 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 4.822 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 1.09 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 110 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 us2000i7ji Id of event.
Event Code 2000i7ji An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us2000i7ji, A comma-separated list of event ids that are associated to an event.

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