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Light earthquake 4.1 mag, 6 km NNW of Arecibo, Puerto Rico


Earthquake location 18.533S, -66.729WA light earthquake magnitude 4.1 (ml/mb) has struck on Sunday, 6 kilometers (4 miles) from Arecibo in Puerto Rico. Exact location of event, longitude -66.729 West, latitude 18.533 North, depth = 90 km. A tsunami warning has been issued near Arecibo in Puerto Rico (Does not indicate if a tsunami actually did or will exist). Exact time and date of earthquake 10/07/16 / 2016-07-10 04:17:22 / July 10, 2016 @ 4:17 am UTC/GMT. The temblor was picked up at 00:17:22 / 12:17 am (local time epicenter). The earthquake occurred at a depth of 90 km (56 miles). Unique identifier: at00oa2zwy. Ids that are associated to the event: at00oa2zwy.

Event epicenter was 66 km (41 miles) from San Juan (c. 418 100 pop), 62 km (39 miles) from Bayamón (c. 203 500 pop), 83 km (52 miles) from Carolina (c. 170 400 pop), 59 km (37 miles) from Ponce (c. 152 600 pop), 79 km (49 miles) from Caguas (c. 86 800 pop), 68 km (42 miles) from Guaynabo (c. 81 400 pop). Country/countries that might be effected, Puerto Rico (c. 3 917 000 pop). Nearest cities/city/villages to epicentrum/hypocenter was San Isidro, Loíza, San Lorenzo (min 5000 pop).

There are an estimated 13,000 light earthquakes in the world each year. In the past 24 hours, there have been one, in the last 10 days eight, in the past 30 days sixteen and in the last 365 days two hundred and eighty-four earthquakes of magnitude 3.0 or greater that has occurred nearby. Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage.

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. Read more about the earthquake, Distances, Seismometer information, Date-Time, Parameters, Location and details about this quake, that has struck: 6 km NNW of Arecibo, Puerto Rico. This data comes from the USGS Earthquake Notification Service.

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More information

Parameter Value Description
Magnitude 4.1 mb The magnitude for the event.
Longitude -66.729° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 18.533° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 90 km Depth of the event in kilometers.
Place 6km NNW of Arecibo, 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 2016-07-10 04:17:22 Time when the event occurred. UTC/GMT
Updated 2016-07-10 04:26:23 Time when the event was most recently updated. UTC/GMT
Timezone offset -240 Timezone offset from UTC in minutes at the event epicenter.
Felt 7 The total number of felt reports
CDI 3.1 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 1 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 261 A number describing how significant the event is. Larger numbers indicate a more significant event.
Network at The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources ,at, A comma-separated list of network contributors.
Number of Stations Used 28 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 0.1868496 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 147.599988192 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 at00oa2zwy Id of event.
Event Code 00oa2zwy An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,at00oa2zwy, A comma-separated list of event ids that are associated to an event.

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