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Light World Earthquakes Magnitude 4-4.9

Light earthquake: M4.2 quake has struck near Hihifo in Tonga

Earthquake location -16.1874S, -175.8369WA light earthquake with magnitude 4.2 (ml/mb) was reported 224 km W of Hihifo, Tonga (139 miles) on Tuesday. The temblor was detected at 01:02:09 / 1:02 am (local time epicenter). The earthquake occurred at a depth of 350 km (217 miles) below the earth’s surface. Event id: us2000h994. Ids that are associated to the earthquake: us2000h994. Global time and date of event 28/08/18 / 2018-08-28 13:02:09 / August 28, 2018 @ 1:02 pm UTC/GMT. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Exact location of event, longitude -175.8369 West, latitude -16.1874 South, depth = 350 km.

Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage. Every year there are an estimated 13,000 light earthquakes in the world. 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 twenty-five earthquakes of magnitude 3.0 or greater that have been detected nearby.

Questions or comments?

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: 224 km W of Hihifo, Tonga.

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More information

Parameter Value Description
Magnitude 4.2 mb The magnitude for the event.
Longitude -175.8369° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -16.1874° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 350 km Depth of the event in kilometers.
Place 224km W 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 2018-08-28 13:02:09 Time when the event occurred. UTC/GMT
Updated 2018-09-06 14:43:38 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 271 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 4.528 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.58 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 120 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 us2000h994 Id of event.
Event Code 2000h994 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us2000h994, A comma-separated list of event ids that are associated to an event.

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