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Light World Earthquakes Magnitude 4-4.9

Light earthquake 4 mag, 49 km SSW of Coquimbo, Chile


Earthquake location -30.3314S, -71.6223WA light earthquake magnitude 4 (ml/mb) has occurred on Saturday, 49 kilometers (30 miles) from Coquimbo in Chile. Event ids that are associated to the earthquake: us20004gun. Id of event: us20004gun. The temblor was detected at 16:22:22 / 4:22 pm (local time epicenter). Exact time and date of event in UTC/GMT: 21/11/15 / 2015-11-21 19:22:22 / November 21, 2015 @ 7:22 pm. Exact location of earthquake, longitude -71.6223 West, latitude -30.3314 South, depth = 29.93 km. The earthquake occurred at a depth of 29.93 km (19 miles). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist).

Close country/countries that might be effected, Chile (c. 16 746 000 pop). The epicenter was 50 km (31 miles) from Coquimbo (c. 161 300 pop), 60 km (37 miles) from La Serena (c. 154 500 pop), 50 km (31 miles) from Ovalle (c. 77 100 pop), 75 km (47 miles) from Monte Patria (c. 13 900 pop). Closest city/cities or villages, with min 5000 pop, to hypocenter/epicentrum was Monte Patria, La Serena, Ovalle.

Each year there are an estimated 13,000 light earthquakes 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 twenty-four, in the last 10 days thirty-six, in the past 30 days eighty and in the last 365 days three hundred and thirty-seven earthquakes of magnitude 3.0 or greater that have been detected nearby.

Questions or comments?

How did you respond? Did any furniture slide, topple over, or become displaced? Leave a comment or report about activity, shaking and damage at your home, city 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: 49 km SSW of Coquimbo, Chile.

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More information

Parameter Value Description
Magnitude 4 mb The magnitude for the event.
Longitude -71.6223° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -30.3314° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 29.93 km Depth of the event in kilometers.
Place 49km SSW of Coquimbo, Chile Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2015-11-21 19:22:22 Time when the event occurred. UTC/GMT
Updated 2015-12-13 03:24:53 Time when the event was most recently updated. UTC/GMT
Timezone offset -180 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 246 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 0.341 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 1.22 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 133 The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type ml The method or algorithm used to calculate the preferred magnitude for the event.
Event Type earthquake Type of seismic event.
Event ID us20004gun Id of event.
Event Code 20004gun An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us20004gun, A comma-separated list of event ids that are associated to an event.

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