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Light earthquake: M4.37 quake has struck near Guánica in Puerto Rico


Earthquake location 17.9461S, -66.9393WA light earthquake magnitude 4.37 (ml/mb) has occurred on Sunday, 4 kilometers (2 miles) from Guánica in Puerto Rico. The temblor was picked up at 06:45:06 / 6:45 am (local time epicenter). Global date and time of event UTC/GMT: 28/06/20 / 2020-06-28 06:45:06 / June 28, 2020 @ 6:45 am. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The earthquake was roughly at a depth of 8 km (5 miles). All ids that are associated to the event: us7000adgx, pr2020180003. Unique identifier: pr2020180003. Exact location of earthquake, -66.9393° West, 17.9461° North, depth 8 km.

Nearest cities/city/villages to epicentrum/hypocenter was Aguas Buenas, Ingenio, Arroyo (min 5000 pop). Country/countries that might be effected, Puerto Rico (c. 3 917 000 pop). Earthquake epicenter was 35 km (22 miles) from Ponce (c. 152 600 pop), 35 km (22 miles) from Mayagüez (c. 78 600 pop), 63 km (39 miles) from Arecibo (c. 49 300 pop), 80 km (50 miles) from Vega Baja (c. 29 300 pop), 70 km (44 miles) from Barceloneta (c. 22 300 pop), 87 km (54 miles) from Guayama (c. 21 600 pop).

In the past 24 hours, there have been twelve, in the last 10 days fifty-one, in the past 30 days one hundred and fifty-four and in the last 365 days two thousand, two hundred and seventy-three 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. There are an estimated 13,000 light earthquakes in the world each year.

Questions or comments?

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, Location, Distances, Seismometer information, Date-Time, Parameters and details about this quake, reported near: 4 km SW of Guánica, Puerto Rico. This information comes from the USGS Earthquake Notification Service.

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More information

Parameter Value Description
Magnitude 4.37 mb The magnitude for the event.
Longitude -66.9393° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 17.9461° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 8 km Depth of the event in kilometers.
Place 4 km SW of Guánica, 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 2020-06-28 06:45:06 Time when the event occurred. UTC/GMT
Updated 2020-06-28 09:03:41 Time when the event was most recently updated. UTC/GMT
Timezone offset Timezone offset from UTC in minutes at the event epicenter.
Felt 126 The total number of felt reports
CDI 5.6 The maximum reported intensity for the event.
MMI 6.128 The maximum estimated instrumental intensity for the event.
Alert Level green 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 364 A number describing how significant the event is. Larger numbers indicate a more significant event.
Network pr The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources ,us,pr, A comma-separated list of network contributors.
Number of Stations Used 22 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 0.1075 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.12 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 196 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 pr2020180003 Id of event.
Event Code 2020180003 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us7000adgx,pr2020180003, A comma-separated list of event ids that are associated to an event.

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