QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

Earthquake near Patillas, PR

No earthquake was likely felt in Patillas in the 24 hours to 12:51 pm AST (16:51 UTC). The last one was M 3.3, 45 km (28 mi) WSW, at 8:40 am AST on 1 November 2026, estimated intensity II (weak) in town. Every earthquake near Patillas

This page: a magnitude 2.3 earthquake was recorded 3 km (2 mi) north-northwest of Patillas, PR, at 6:14 am AST on 10 December 2017 (10:14 UTC), 37 km deep.

USGS: 3 km NNW of Patillas, Puerto Rico

42 km (26 mi) S of San Juan, PR · 22 km (14 mi) S of Caguas, PR

6:14 am AST, Dec 10, 2017 · · 37 km deep · released about 74 lb of TNT

Every earthquake near Patillas Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Patillas Municipio 5 kmArroyo Municipio 7 kmSan Lorenzo Municipio 14 kmGuayama Municipio 14 kmMaunabo Municipio 14 kmCayey Municipio 16 kmYabucoa Municipio 18 kmCaguas Municipio 20 kmCidra Municipio 21 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
6:14 am AST on 10 December 2017 ()
Where
3 km (2 mi) north-northwest of Patillas, PR · earthquakes near Patillas
Magnitude
M 2.3 (md)
Depth
37 km below the surface
Felt
no reports yet
Nearest
Patillas Municipio, 5 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3258 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 Patillas, 3 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: Yaurel, Buena Vista, Palmas, Lamboglia, Corazón, Arroyo.

How big was it?

This earthquake released about 74 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 140,000× the energy of this one
  3. Around the size people start to feel M 3.0 13× the energy of this one
  4. This earthquake M 2.3 about 74 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 3,200 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 · 28 km NNW 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 18.0333, -66.0231. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Patillas Municipio, PR 5 km (3 mi) SE earthquakes near Patillas Municipio
Arroyo Municipio, PR 7 km (4 mi) SSW earthquakes near Arroyo Municipio
San Lorenzo Municipio, PR 14 km (8 mi) NNE earthquakes near San Lorenzo Municipio
Guayama Municipio, PR 14 km (9 mi) WSW earthquakes near Guayama Municipio
Maunabo Municipio, PR 14 km (9 mi) ESE earthquakes near Maunabo Municipio
Cayey Municipio, PR 16 km (10 mi) WNW earthquakes near Cayey Municipio

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

Aftershocks so far

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

  1. 2.8 1 km N of Bayamón, Puerto Rico
  2. 3.3 1 km SE of Sumidero, Puerto Rico
  3. 2.9 4 km SE of Cataño, Puerto Rico
  4. 2.7 13 km W of Esperanza, Puerto Rico
  5. 2.3 2 km ESE of Humacao, Puerto Rico
  6. 2.0 9 km SSW of Central Aguirre, Puerto Rico
  7. 2.2 9 km SSE of Jobos, Puerto Rico
  8. 2.4 14 km SSE of Central Aguirre, Puerto Rico
  9. 2.7 1 km NE of Jauca, Puerto Rico
  10. 2.7 1 km S of G. L. Garcia, Puerto Rico
  11. 2.8 4 km NNE of Guaynabo, Puerto Rico
  12. 2.9 4 km SW of Gurabo, Puerto Rico
  13. 2.7 10 km S of Jobos, Puerto Rico
  14. 1.5 3 km SSW of Arroyo, Puerto Rico
  15. 2.4 5 km N of Yaurel, 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.