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Light earthquake: M4.5 quake has struck near Nuku`alofa in Tonga

Posted by admin on July 4, 2018 0 Comments

Earthquake location -20.1971S, -176.1908WA light earthquake with magnitude 4.5 (ml/mb) was detected on Tuesday, 146 km NW of Nuku`alofa, Tonga (91 miles). Exact location of event, longitude -176.1908 West, latitude -20.1971 South, depth = 238.23 km. Exact time and date of earthquake 04/07/18 / 2018-07-04 08:57:23 / July 4, 2018 @ 8:57 am UTC/GMT. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The 4.5-magnitude earthquake was detected at 20:57:23 / 8:57 pm (local time epicenter). Unique identifier: us2000fwnt. Ids that are associated to the event: us2000fwnt. The earthquake occurred at a depth of 238.23 km (148 miles) below the earth’s surface.

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 one, in the last 10 days one, in the past 30 days one and in the last 365 days twenty-three earthquakes of magnitude 3.0 or greater that has occurred nearby.

Questions or comments?

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. 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: 146 km NW of Nuku`alofa, Tonga.

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More information

Parameter Value Description
Magnitude 4.5 mb The magnitude for the event.
Longitude -176.1908° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -20.1971° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 238.23 km Depth of the event in kilometers.
Place 146km 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 2018-07-04 08:57:23 Time when the event occurred. UTC/GMT
Updated 2018-07-04 09:14:28 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 5.968 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 1.27 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 92 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 us2000fwnt Id of event.
Event Code 2000fwnt An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us2000fwnt, A comma-separated list of event ids that are associated to an event.

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