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Light World Earthquakes Magnitude 4-4.9

Light earthquake: M4.1 quake has struck near Haveluloto in Tonga

Posted by admin on November 6, 2020 0 Comments

Earthquake location -20.5141S, -177.7137WA light earthquake with magnitude 4.1 (ml/mb) was reported 269 km WNW of Haveluloto, Tonga (167 miles) on Saturday. Exact location, longitude -177.7137° West, latitude -20.5141° South, depth = 498.95 km. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The 4.1-magnitude earthquake has occurred at 02:27:10 / 2:27 am (local time epicenter). The earthquake occurred at a depth of 498.95 km (310 miles) below the earth’s surface. Exact time and date of earthquake 31/10/20 / 2020-10-31 02:27:10 / October 31, 2020 @ 2:27 am UTC/GMT. Event ids that are associated to the earthquake: us7000cav1. Id of event: us7000cav1.

In the past 24 hours, there have been four, in the last 10 days five, in the past 30 days sixteen and in the last 365 days one hundred and seventy earthquakes of magnitude 3.0 or greater that have been detected in the same area. There are an estimated 13,000 light earthquakes in the world each year. Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage.

Questions or comments?

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: 269 km WNW of Haveluloto, Tonga.

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More information

Parameter Value Description
Magnitude 4.1 mb The magnitude for the event.
Longitude -177.7137° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -20.5141° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 498.95 km Depth of the event in kilometers.
Place 269 km WNW of Haveluloto, Tonga Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2020-10-31 02:27:10 Time when the event occurred. UTC/GMT
Updated 2020-11-06 00:49:22 Time when the event was most recently updated. UTC/GMT
Timezone offset 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 259 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 4.858 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.74 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 79 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 us7000cav1 Id of event.
Event Code 7000cav1 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us7000cav1, A comma-separated list of event ids that are associated to an event.

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