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Light World Earthquakes Magnitude 4-4.9

Light earthquake: M4.3 quake has struck near Hihifo in Tonga


Earthquake location -16.9537S, -174.0033WA light earthquake magnitude 4.3 (ml/mb) has struck on Tuesday, 112 km SSW of Hihifo, Tonga (70 miles). The 4.3-magnitude earthquake was detected at 19:32:04 / 7:32 pm (local time epicenter). Global date and time of event UTC/GMT: 28/07/20 / 2020-07-28 19:32:04 / July 28, 2020 @ 7:32 pm. The earthquake occurred at a depth of 135 km (84 miles) below the earth’s surface. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Event ids that are associated to the earthquake: us6000b8sf. Id of event: us6000b8sf. Exact location of event, depth 135 km, -174.0033° West, -16.9537° South.

There are an estimated 13,000 light quakes in the world each year. Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage. In the past 24 hours, there have been six, in the last 10 days eight, in the past 30 days nine and in the last 365 days fourty-four earthquakes of magnitude 3.0 or greater that have been detected nearby.

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: 112 km SSW of Hihifo, Tonga.

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More information

Parameter Value Description
Magnitude 4.3 mb The magnitude for the event.
Longitude -174.0033° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -16.9537° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 135 km Depth of the event in kilometers.
Place 112 km SSW 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 2020-07-28 19:32:04 Time when the event occurred. UTC/GMT
Updated 2020-08-26 21:11:24 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 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 3.708 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 1.06 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 129 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 us6000b8sf Id of event.
Event Code 6000b8sf An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us6000b8sf, A comma-separated list of event ids that are associated to an event.

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