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Light World Earthquakes Magnitude 4-4.9

Light earthquake, 4.5 mag was detected near Hihifo in Tonga


Earthquake location -15.5902S, -173.4989WA light earthquake with magnitude 4.5 (ml/mb) was reported 48 kilometers (30 miles) from Hihifo in Tonga on Saturday. Event ids that are associated to the earthquake: us70004qm3. Id of event: us70004qm3. The earthquake occurred at a depth of 35 km (22 miles) below the earth’s surface. The temblor was picked up at 08:51:27 / 8:51 am (local time epicenter). Global time and date of event 13/07/19 / 2019-07-13 20:51:27 / July 13, 2019 @ 8:51 pm UTC/GMT. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Exact location, longitude -173.4989° West, latitude -15.5902° South, depth = 35 km.

Earthquake epicenter was 51 km (32 miles) from Hihifo (c. 800 pop). Closest city/cities/towns to epicentrum/hypocenter was Hihifo (min 5000 pop). Close country/countries that might be effected, Tonga (c. 123 000 pop).

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

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: 48 km NE of Hihifo, Tonga.

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More information

Parameter Value Description
Magnitude 4.5 mb The magnitude for the event.
Longitude -173.4989° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -15.5902° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 35 km Depth of the event in kilometers.
Place 48km NE 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 2019-07-13 20:51:27 Time when the event occurred. UTC/GMT
Updated 2019-07-25 02:20:57 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 4.863 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.55 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 128 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 us70004qm3 Id of event.
Event Code 70004qm3 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us70004qm3, A comma-separated list of event ids that are associated to an event.

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