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Light World Earthquakes Magnitude 4-4.9

Light earthquake, 4.5 mag was detected near `Ohonua in Tonga

Earthquake location -23.0832S, -175.2184WA light earthquake magnitude 4.5 (ml/mb) strikes 195 km S of `Ohonua, Tonga (121 miles) on Friday. The temblor was detected at 07:51:28 / 7:51 am (local time epicenter). Exact location of earthquake, longitude -175.2184 West, latitude -23.0832 South, depth = 40.05 km. The epicenter was at a depth of 40.05 km (25 miles). Event ids that are associated to the earthquake: us1000axky. Id of event: us1000axky. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Date and time of earthquake in UTC/GMT: 20/10/17 / 2017-10-20 19:51:28 / October 20, 2017 @ 7:51 pm.

Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage. In the past 24 hours, there have been three, in the last 10 days fifteen, in the past 30 days seventeen and in the last 365 days thirty-two earthquakes of magnitude 3.0 or greater that has occurred nearby. Each year there are an estimated 13,000 light quakes in the world.

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. 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: 195 km S of `Ohonua, Tonga.

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More information

Parameter Value Description
Magnitude 4.5 mb The magnitude for the event.
Longitude -175.2184° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -23.0832° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 40.05 km Depth of the event in kilometers.
Place 195km S of `Ohonua, Tonga Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2017-10-20 19:51:28 Time when the event occurred. UTC/GMT
Updated 2017-11-14 22:30:41 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 6.348 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.98 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 115 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 us1000axky Id of event.
Event Code 1000axky An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us1000axky, A comma-separated list of event ids that are associated to an event.

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