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Light World Earthquakes Magnitude 4-4.9

Light earthquake, 4.3 mag was detected near Havelu in Tonga


Earthquake location -21.1827S, -176.9909WA light earthquake magnitude 4.3 (ml/mb) has struck on Saturday, 184 km W of Havelu, Tonga (114 miles). Exact location of event, depth 348.47 km, -176.9909° West, -21.1827° South. The 4.3-magnitude earthquake was detected at 15:52:25 / 3:52 pm (local time epicenter). The earthquake occurred at a depth of 348.47 km (217 miles). Unique identifier: us2000i5yz. Ids that are associated to the event: us2000i5yz. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Date and time of earthquake in UTC/GMT: 28/10/18 / 2018-10-28 03:52:25 / October 28, 2018 @ 3:52 am.

Every 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 five and in the last 365 days fourty-two earthquakes of magnitude 3.0 or greater that have been detected in the same area.

Did you feel it?

Were you asleep? Was it difficult to stand and/or walk? Leave a comment or report about shaking, activity and damage at your city, home and country. 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: 184 km W of Havelu, Tonga.

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More information

Parameter Value Description
Magnitude 4.3 mb The magnitude for the event.
Longitude -176.9909° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -21.1827° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 348.47 km Depth of the event in kilometers.
Place 184km W of Havelu, Tonga Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2018-10-28 03:52:25 Time when the event occurred. UTC/GMT
Updated 2018-11-03 04:09:33 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 6.959 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 1.15 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 121 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 us2000i5yz Id of event.
Event Code 2000i5yz An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us2000i5yz, A comma-separated list of event ids that are associated to an event.

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