QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

Earthquake near La Fermina, PR

No earthquake was likely felt in La Fermina in the 24 hours to 9:00 pm AST (01:00 UTC). The last one was M 4.1, 60 km (37 mi) ESE, at 5:44 am AST on 28 October 2026, estimated intensity II (weak) in town; 5 felt reports to USGS. Every earthquake near La Fermina

This page: a magnitude 2.7 earthquake was recorded 2 km (1 mi) east of La Fermina, PR, at 5:34 am AST on 25 July 2018 (09:34 UTC), 96 km deep.

USGS: 2 km E of La Fermina, Puerto Rico

35 km (22 mi) SE of San Juan, PR · 23 km (14 mi) ESE of Caguas, PR

5:34 am AST, Jul 25, 2018 · · 96 km deep · released about 390 lb of TNT

Every earthquake near La Fermina Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Las Piedras Municipio 4 kmHumacao Municipio 7 kmJuncos Municipio 10 kmNaguabo Municipio 11 kmYabucoa Municipio 13 kmSan Lorenzo Municipio 15 kmCanóvanas Municipio 18 kmGurabo Municipio 19 kmMaunabo 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
5:34 am AST on 25 July 2018 ()
Where
2 km (1 mi) east of La Fermina, PR · earthquakes near La Fermina
Magnitude
M 2.7 (md)
Depth
96 km below the surface
Felt
no reports yet
Nearest
Las Piedras Municipio, 4 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3032 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 it was probably too small to be felt, even directly above it. In La Fermina, 2 km away, the estimate is intensity I (not felt). 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: Antón Ruiz, Humacao, Las Piedras, Peña Pobre, Bajandas, Pueblito del Rio.

How big was it?

This earthquake released about 390 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 39,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 28,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.5× the energy of this one
  4. This earthquake M 2.7 about 390 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 620 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 · 33 km WNW 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 18.1756, -65.8343. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Las Piedras Municipio, PR 4 km (3 mi) WNW earthquakes near Las Piedras Municipio
Humacao Municipio, PR 7 km (4 mi) SE earthquakes near Humacao Municipio
Juncos Municipio, PR 10 km (6 mi) NW earthquakes near Juncos Municipio
Naguabo Municipio, PR 11 km (7 mi) ENE earthquakes near Naguabo Municipio
Yabucoa Municipio, PR 13 km (8 mi) SSW earthquakes near Yabucoa Municipio
San Lorenzo Municipio, PR 15 km (10 mi) WSW earthquakes near San Lorenzo Municipio

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

Aftershocks so far

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

  1. 2.2 5 km ESE of G. L. Garcia, Puerto Rico
  2. 2.1 2 km SSW of Aguas Buenas, Puerto Rico
  3. 2.8 23 km NNE of Luquillo, Puerto Rico
  4. 1.7 7 km SE of Pájaros, Puerto Rico
  5. 2.0 18 km SE of El Negro, Puerto Rico
  6. 2.6 17 km NNE of Vieques, Puerto Rico
  7. 2.4 21 km SE of El Negro, Puerto Rico
  8. 2.3 6 km NW of Yaurel, Puerto Rico
  9. 3.1 4 km NNE of Bairoa, Puerto Rico
  10. 1.7 2 km SSE of Pájaros, Puerto Rico
  11. 2.4 4 km NNE of Guaynabo, Puerto Rico
  12. 2.2 5 km ESE of G. L. Garcia, Puerto Rico
  13. 2.7 5 km ESE of San Juan, Puerto Rico
  14. 2.3 26 km SE of El Negro, Puerto Rico
  15. 2.1 3 km ESE of Cayey, 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.