QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5md

Earthquake near Coquí, PR

No earthquake was likely felt in Coquí in the 24 hours to 3:15 am AST (07:15 UTC). The last one was M 3.0, 24 km (15 mi) SW, at 7:09 pm AST on 5 November 2026, estimated intensity II (weak) in town. Every earthquake near Coquí

This page: a magnitude 1.5 earthquake was recorded 2 km (1 mi) north of Coquí, PR, at 12:27 am AST on 6 August 2018 (04:27 UTC), 14 km deep.

USGS: 2 km N of Coquí, Puerto Rico

49 km (30 mi) SSW of San Juan, PR · 33 km (21 mi) SW of Caguas, PR

12:27 am AST, Aug 6, 2018 · · 14 km deep · released about 5.6 lb of TNT

Every earthquake near Coquí Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Salinas Municipio 5 kmGuayama Municipio 9 kmCayey Municipio 14 kmAibonito Municipio 16 kmSanta Isabel Municipio 18 kmCoamo Municipio 19 kmArroyo Municipio 19 kmCidra Municipio 21 kmBarranquitas Municipio 25 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
12:27 am AST on 6 August 2018 ()
Where
2 km (1 mi) north of Coquí, PR · earthquakes near Coquí
Magnitude
M 1.5 (md)
Depth
14 km below the surface
Felt
no reports yet
Nearest
Salinas Municipio, 5 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3020 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. In Coquí, 2 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Earthquakes near other towns within 30 km: Coco, Central Aguirre, La Plena, Jobos, Salinas, Vázquez.

How big was it?

This earthquake released about 5.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
  3. Around the size people start to feel M 3.0 170× the energy of this one
  4. This earthquake M 1.5 about 5.6 lb of TNT

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

For this area

The largest earthquake within 50 km since 2016 was M 4.6 on 2016-12-05 — about 43,000 times the energy of this one.

Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:

  1. 5.1 3 km W of Aguas Buenas, Puerto Rico · 31 km NNE of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 17.9928, -66.2236. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Salinas Municipio, PR 5 km (3 mi) WSW earthquakes near Salinas Municipio
Guayama Municipio, PR 9 km (6 mi) ESE earthquakes near Guayama Municipio
Cayey Municipio, PR 14 km (9 mi) NNE earthquakes near Cayey Municipio
Aibonito Municipio, PR 16 km (10 mi) NNW earthquakes near Aibonito Municipio
Santa Isabel Municipio, PR 18 km (11 mi) WSW earthquakes near Santa Isabel Municipio
Coamo Municipio, PR 19 km (12 mi) NW earthquakes near Coamo Municipio

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

38 earthquakes have been recorded within 50 km since this one.

  1. 1.6 4 km W of Central Aguirre, Puerto Rico
  2. 1.8 5 km SSW of Central Aguirre, Puerto Rico
  3. 2.1 2 km SSE of Ponce, Puerto Rico
  4. 2.1 21 km SSE of Tallaboa, Puerto Rico
  5. 2.4 4 km NNE of Guaynabo, Puerto Rico
  6. 1.9 1 km N of Las Ochenta, Puerto Rico
  7. 2.2 5 km ESE of G. L. Garcia, Puerto Rico
  8. 2.0 0 km NW of Playita Cortada, Puerto Rico
  9. 2.2 1 km ESE of Potala Pastillo, Puerto Rico
  10. 2.1 3 km ESE of Cayey, Puerto Rico
  11. 2.4 2 km SSE of Cidra, Puerto Rico
  12. 2.5 17 km SSE of Jobos, Puerto Rico
  13. 2.5 3 km WSW of Sumidero, Puerto Rico
  14. 2.1 11 km SSW of Potala Pastillo, Puerto Rico
  15. 1.5 9 km SSE of Tallaboa, Puerto Rico

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.