QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

Earthquake near Espino, PR

No earthquake was likely felt in Espino in the 24 hours to 4:21 pm AST (20:21 UTC). The last one was M 3.0, 35 km (22 mi) S, at 5:47 pm AST on 7 November 2026, estimated intensity II (weak) in town. Every earthquake near Espino

This page: a magnitude 2.7 earthquake was recorded 6 km (4 mi) southeast of Espino, PR, at 6:19 am AST on 4 December 2017 (10:19 UTC), 21 km deep.

USGS: 6 km SE of Espino, Puerto Rico

7 km (4 mi) ENE of Mayagüez, PR · 109 km (68 mi) W of San Juan, PR

6:19 am AST, Dec 4, 2017 · · 21 km deep · released about 320 lb of TNT

Every earthquake near Espino Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Añasco Municipio 8 kmLas Marías Municipio 11 kmHormigueros Municipio 11 kmSan Germán Municipio 15 kmMoca Municipio 16 kmSan Sebastián Municipio 16 kmMaricao Municipio 17 kmAguada Municipio 19 kmRincón 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
6:19 am AST on 4 December 2017 ()
Where
6 km (4 mi) southeast of Espino, PR · earthquakes near Espino
Magnitude
M 2.7 (md)
Depth
21 km below the surface
Felt
no reports yet
Nearest
Añasco Municipio, 8 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3264 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 14 km (9 mi) from the epicentre. In Espino, 6 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.

Likely felt in: Mayagüez 7 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 320 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 48,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 34,000× the energy of this one
  3. Around the size people start to feel M 3.0 3× the energy of this one
  4. This earthquake M 2.7 about 320 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 4.3 on 2017-10-14 — about 270 times the energy of this one.

Before 2016, the USGS record lists 6 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.3 6 km WNW of Aguadilla, Puerto Rico · 27 km NNW of this epicentre
  2. 6.1 15 km WNW of San Antonio, Puerto Rico · 39 km NNW of this epicentre
  3. 6.1 18 km NNW of San Antonio, Puerto Rico · 46 km NNW of this epicentre
  4. 5.8 4 km E of Moca, Puerto Rico · 19 km N of this epicentre
  5. 5.2 19 km SW of Stella, Puerto Rico · 31 km W 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 18.2325, -67.0843. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Añasco Municipio, PR 8 km (5 mi) NW earthquakes near Añasco Municipio
Las Marías Municipio, PR 11 km (7 mi) E earthquakes near Las Marías Municipio
Hormigueros Municipio, PR 11 km (7 mi) SSW earthquakes near Hormigueros Municipio
San Germán Municipio, PR 15 km (9 mi) SSE earthquakes near San Germán Municipio
Moca Municipio, PR 16 km (10 mi) N earthquakes near Moca Municipio
San Sebastián Municipio, PR 16 km (10 mi) NE earthquakes near San Sebastián Municipio

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

Aftershocks so far

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

  1. 2.0 9 km WNW of Puerto Real, Puerto Rico
  2. 1.6 5 km E of La Parguera, Puerto Rico
  3. 2.5 23 km W of Rincón, Puerto Rico
  4. 2.2 5 km SW of Palmarejo, Puerto Rico
  5. 2.7 21 km W of Rincón, Puerto Rico
  6. 2.8 7 km SSE of Maria Antonia, Puerto Rico
  7. 2.6 27 km SW of Stella, Puerto Rico
  8. 2.7 13 km WNW of Puerto Real, Puerto Rico
  9. 2.5 18 km SSW of Stella, Puerto Rico
  10. 2.0 12 km WNW of Puerto Real, Puerto Rico
  11. 2.5 Mona Passage
  12. 2.3 18 km WNW of Puerto Real, Puerto Rico
  13. 3.0 11 km N of Camuy, Puerto Rico
  14. 2.0 7 km WSW of Puerto Real, Puerto Rico
  15. 1.7 13 km S of Indios, 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.