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Light World Earthquakes Magnitude 4-4.9

Light earthquake 4.7 mag, 150 km W of Neiafu, Tonga

Posted by admin on April 23, 2015 0 Comments

Earthquake location -18.5257S, -175.4007WA light earthquake magnitude 4.7 (mg/mb) has occurred on Thursday, 150 kilometers (93 miles) from Neiafu in Tonga. The temblor was reported at 10:21:04 / 10:21 am (local time epicenter) at a depth of 194.53 km (121 miles). Global time of event 23/04/15 / 2015-04-23 22:21:04 / April 23, 2015 @ 10:21 pm UTC/GMT. A tsunami warning has not been issued, according to the U.S. Geological Survey. Exact location of event, longitude -175.4007 West, latitude -18.5257 South, depth 194.53 km, unique identifier, us200028nu.

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Leave a comment or report about shaking, activity and damage at your home, city and country. Read more about the earthquake, Seismometer information, Date-Time, Location, Distances, Parameters and details about this quake, recorded in: 150 km W of Neiafu, Tonga.


More information

Parameter Value Description
Magnitude 4.7 mb The magnitude for the event.
Longitude -175.4007° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -18.5257° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 194.53 km Depth of the event in kilometers.
Place 150km W of Neiafu, Tonga Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2015-04-23 22:21:04 Time when the event occurred. UTC/GMT
Updated 2015-04-23 22:38:21 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 340 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 5.213 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 1.25 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 75 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 us200028nu Id of event.
Event Code 200028nu An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us200028nu, A comma-separated list of event ids that are associated to an event.

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