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Light World Earthquakes Magnitude 4-4.9

Light earthquake, 4.6 mag was detected near Hihifo in Tonga


Earthquake location -15.6818S, -173.5045WA light earthquake with magnitude 4.6 (ml/mb) was reported 39 kilometers (24 miles) from Hihifo in Tonga on Thursday. The temblor was detected at 10:03:56 / 10:03 am (local time epicenter). Exact location of earthquake, longitude -173.5045 West, latitude -15.6818 South, depth = 23.48 km. Id of earthquake: us1000335b. Event ids that are associated: us1000335b. Date and time of earthquake in UTC/GMT: 30/07/15 / 2015-07-30 22:03:56 / July 30, 2015 @ 10:03 pm. The earthquake was roughly at a depth of 23.48 km (15 miles). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist).

Nearest city/cities or towns, with min 5000 pop, to epicentrum/hypocenter was Hihifo. Epicenter of the event was 43 km (27 miles) from Hihifo (c. 800 pop). Nearby country/countries that might be effected, Tonga (c. 123 000 pop).

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

How would you describe the shaking?

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: 39 km NE of Hihifo, Tonga.

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More information

Parameter Value Description
Magnitude 4.6 mb The magnitude for the event.
Longitude -173.5045° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -15.6818° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 23.48 km Depth of the event in kilometers.
Place 39km 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 2015-07-30 22:03:56 Time when the event occurred. UTC/GMT
Updated 2015-08-24 22:44:05 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 2.428 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.64 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 69 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 us1000335b Id of event.
Event Code 1000335b An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us1000335b, A comma-separated list of event ids that are associated to an event.

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