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Light earthquake: M4 quake has struck near Aguadilla in Puerto Rico

Earthquake location 18.7842S, -67.5561WA light earthquake magnitude 4 (ml/mb) strikes 57 kilometers (35 miles) from Aguadilla in Puerto Rico on Saturday. The epicenter of the earthquake was roughly 34.84 km (22 miles) below the earth’s surface. Exact location of event, depth 34.84 km, -67.5561° West, 18.7842° North. 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: 21/12/19 / 2019-12-21 23:14:56 / December 21, 2019 @ 11:14 pm. The 4-magnitude earthquake was detected at 18:14:56 / 6:14 pm (local time epicenter). Unique identifier: us70006pm1. Ids that are associated to the event: us70006pm1.

Epicenter of the event was 78 km (49 miles) from Mayagüez (c. 78 600 pop), 58 km (36 miles) from Aguadilla (c. 16 100 pop), 64 km (40 miles) from Isabela (c. 12 500 pop), 85 km (53 miles) from Hormigueros (c. 11 900 pop), 78 km (48 miles) from San Sebastián (c. 11 600 pop), 89 km (55 miles) from Cabo Rojo (c. 10 800 pop). Nearby country/countries that might be effected, Puerto Rico (c. 3 917 000 pop). Closest city/cities or villages, with min 5000 pop, to hypocenter/epicentrum was Lares, Cabo Rojo, Puerto Real.

Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage. In the past 24 hours, there have been nine, in the last 10 days eighty-nine, in the past 30 days one hundred and sixty-one and in the last 365 days nine hundred and sixty-three earthquakes of magnitude 3.0 or greater that was reported nearby. Every year there are an estimated 13,000 light earthquakes in the world.

Did you feel it?

Did objects rattle, topple over, or fall off shelves? Leave a comment or report about activity, shaking and damage at your home, country and city. Read more about the earthquake, Distances, Seismometer information, Date-Time, Parameters, Location and details about this quake, that has struck: 57 km NW of Aguadilla, Puerto Rico. This data comes from the USGS Earthquake Notification Service.

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More information

Parameter Value Description
Magnitude 4 mb The magnitude for the event.
Longitude -67.5561° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 18.7842° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 34.84 km Depth of the event in kilometers.
Place 57km NW of Aguadilla, Puerto Rico Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2019-12-21 23:14:56 Time when the event occurred. UTC/GMT
Updated 2019-12-21 23:29:25 Time when the event was most recently updated. UTC/GMT
Timezone offset -300 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 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 0.526 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 1.36 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 132 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 us70006pm1 Id of event.
Event Code 70006pm1 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us70006pm1, A comma-separated list of event ids that are associated to an event.

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