QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

40 km NNE of Isabela, Puerto Rico

· 28 km deep · released about 290 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Isabela Municipio 42 kmQuebradillas Municipio 44 kmCamuy Municipio 47 kmAguadilla Municipio 47 kmHatillo Municipio 49 kmMoca Municipio 56 kmArecibo Municipio 56 kmSan Sebastián Municipio 59 kmAguada Municipio 59 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
Magnitude
M 2.7 (md)
Depth
28 km below the surface
Felt
no reports yet
Nearest
Isabela Municipio, 42 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2495 days ago

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

How big was it?

This earthquake released about 290 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 51,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 36,000× the energy of this one
  3. Around the size people start to feel M 3.0 3.2× the energy of this one
  4. This earthquake M 2.7 about 290 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.

Where

Epicentre 18.8611, -66.9483. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Isabela Municipio, PR 42 km (26 mi) N of here earthquakes near Isabela Municipio
Quebradillas Municipio, PR 44 km (27 mi) N of here earthquakes near Quebradillas Municipio
Camuy Municipio, PR 47 km (29 mi) N of here earthquakes near Camuy Municipio
Aguadilla Municipio, PR 47 km (29 mi) NNE of here earthquakes near Aguadilla Municipio
Hatillo Municipio, PR 49 km (31 mi) NNW of here earthquakes near Hatillo Municipio
Moca Municipio, PR 56 km (34 mi) NNE of here earthquakes near Moca Municipio

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

Aftershocks so far

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

  1. 2.7 83 km N of Isabela, Puerto Rico
  2. 2.9 45 km NNW of San Antonio, Puerto Rico
  3. 3.3 42 km NNW of San Antonio, Puerto Rico
  4. 2.7 40 km NW of San Antonio, Puerto Rico
  5. 2.9 78 km N of Isabela, Puerto Rico
  6. 3.1 44 km N of Isabela, Puerto Rico
  7. 2.8 66 km NNW of San Antonio, Puerto Rico
  8. 2.9 65 km NNW of San Antonio, Puerto Rico
  9. 2.6 73 km N of San Antonio, Puerto Rico
  10. 2.8 66 km N of San Antonio, Puerto Rico
  11. 3.1 53 km N of San Antonio, Puerto Rico
  12. 3.3 61 km N of San Antonio, Puerto Rico
  13. 2.9 63 km N of San Antonio, Puerto Rico
  14. 3.0 66 km N of San Antonio, Puerto Rico
  15. 3.2 73 km N of San Antonio, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 6.0 on 2019-09-24 — it released about 100,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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