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Minor earthquake: M3.11 quake has struck near Loíza in Puerto Rico

Earthquake location 18.4643S, -65.8913WA minor earthquake magnitude 3.11 (ml/mb) has occurred on Thursday, 3 kilometers (2 miles) from Loíza in Puerto Rico. The earthquake occurred at a depth of 87 km (54 miles) below the earth’s surface. Exact location, longitude -65.8913° West, latitude 18.4643° North, depth = 87 km. The temblor was detected at 13:32:18 / 1:32 pm (local time epicenter). Date and time of earthquake in UTC/GMT: 23/07/20 / 2020-07-23 13:32:18 / July 23, 2020 @ 1:32 pm. Unique identifier: pr2020205002. Ids that are associated to the event: pr2020205002.

Close country/countries that might be effected, Puerto Rico (c. 3 917 000 pop). Nearest cities/city/towns to hypocenter/epicentrum was Juana Díaz, Jayuya, Santa Isabel (min 5000 pop). Epicenter of the event was 23 km (14 miles) from San Juan (c. 418 100 pop), 29 km (18 miles) from Bayamón (c. 203 500 pop), 12 km (7 miles) from Carolina (c. 170 400 pop), 31 km (19 miles) from Caguas (c. 86 800 pop), 26 km (16 miles) from Guaynabo (c. 81 400 pop).

In the past 24 hours, there have been one, in the last 10 days seven, in the past 30 days thirty-three and in the last 365 days eight hundred and three earthquakes of magnitude 3.0 or greater that have been detected nearby. Earthquakes 2.5 to 3.2 are often felt, but only causes minor damage. Each year there are an estimated 130,000 minor quakes in the world.

Did you feel the quake?

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. 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: 3 km NNW of Loíza, Puerto Rico.

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More information

Parameter Value Description
Magnitude 3.11 mb The magnitude for the event.
Longitude -65.8913° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 18.4643° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 87 km Depth of the event in kilometers.
Place 3 km NNW of Loíza, 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 2020-07-23 13:32:18 Time when the event occurred. UTC/GMT
Updated 2020-07-23 13:55:02 Time when the event was most recently updated. UTC/GMT
Timezone offset 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 149 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 ,pr, A comma-separated list of network contributors.
Number of Stations Used 14 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 0.325 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.36 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 260 The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type md The method or algorithm used to calculate the preferred magnitude for the event.
Event Type earthquake Type of seismic event.
Event ID pr2020205002 Id of event.
Event Code 2020205002 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,pr2020205002, A comma-separated list of event ids that are associated to an event.

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