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Light World Earthquakes Magnitude 4-4.9

Light earthquake 4.4 mag, 153 km SW of Vaini, Tonga

Earthquake location -22.3168S, -176.0817WA light earthquake magnitude 4.4 (ml/mb) has occurred on Thursday, 153 km SW of Vaini, Tonga (95 miles). The temblor was reported at 09:47:22 / 9:47 am (local time epicenter). Exact location, longitude -176.0817° West, latitude -22.3168° South, depth = 94.41 km. All ids that are associated to the event: us1000335s. Unique identifier: us1000335s. The earthquake occurred at a depth of 94.41 km (59 miles). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Exact time and date of earthquake 30/07/15 / 2015-07-30 21:47:22 / July 30, 2015 @ 9:47 pm UTC/GMT.

There are an estimated 13,000 light quakes in the world each year. In the past 24 hours, there have been four, in the last 10 days four, in the past 30 days four and in the last 365 days thirteen 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.

Did you feel the quake?

What was your situation during the earthquake? Leave a comment or report about damage, shaking and activity at your home, city and country. This data comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Distances, Parameters, Date-Time, Location and details about this quake, that has occurred near: 153 km SW of Vaini, Tonga.

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More information

Parameter Value Description
Magnitude 4.4 mb The magnitude for the event.
Longitude -176.0817° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -22.3168° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 94.41 km Depth of the event in kilometers.
Place 153km SW of Vaini, 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 21:47:22 Time when the event occurred. UTC/GMT
Updated 2015-08-25 00:48:56 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 298 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 6.601 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.43 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 131 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 us1000335s Id of event.
Event Code 1000335s An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us1000335s, A comma-separated list of event ids that are associated to an event.

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