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Light World Earthquakes Magnitude 4-4.9

Light earthquake, 4.6 mag was detected near Hihifo in Tonga


Earthquake location -15.337S, -173.8746WA light earthquake magnitude 4.6 (ml/mb) has struck on Saturday, 69 kilometers (43 miles) from Hihifo in Tonga. The epicenter was at a depth of 66.63 km (41 miles). The 4.6-magnitude earthquake was detected at 09:42:07 / 9:42 am (local time epicenter). Id of earthquake: us20006ewh. Event ids that are associated: us20006ewh. Exact location of earthquake, longitude -173.8746 West, latitude -15.337 South, depth = 66.63 km. Global time and date of event 09/07/16 / 2016-07-09 21:42:07 / July 9, 2016 @ 9:42 pm UTC/GMT. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist).

Epicenter of the earthquake was 69 km (43 miles) from Hihifo (c. 800 pop). Close country/countries that might be effected, Tonga (c. 123 000 pop). Nearest cities/city/villages to epicentrum/hypocenter was Hihifo (min 5000 pop).

Each year there are an estimated 13,000 light quakes 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 four, in the last 10 days six, in the past 30 days ten and in the last 365 days fifty-seven earthquakes of magnitude 3.0 or greater that has occurred nearby.

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: 69 km N of Hihifo, Tonga.

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More information

Parameter Value Description
Magnitude 4.6 mb The magnitude for the event.
Longitude -173.8746° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -15.337° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 66.63 km Depth of the event in kilometers.
Place 69km N 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 2016-07-09 21:42:07 Time when the event occurred. UTC/GMT
Updated 2016-07-22 23:56:58 Time when the event was most recently updated. UTC/GMT
Timezone offset -720 Timezone offset from UTC in minutes at the event epicenter.
Felt 0 The total number of felt reports
CDI 1 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 326 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 2.477 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.34 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 103 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 us20006ewh Id of event.
Event Code 20006ewh An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us20006ewh, A comma-separated list of event ids that are associated to an event.

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