QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

4 km SSW of Las Piedras, Puerto Rico

· 19 km deep · released about 37 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Las Piedras Municipio 5 kmJuncos Municipio 9 kmSan Lorenzo Municipio 9 kmYabucoa Municipio 10 kmHumacao Municipio 11 kmMaunabo Municipio 16 kmGurabo Municipio 17 kmNaguabo Municipio 18 kmCaguas Municipio 18 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 2.1 (md)
Depth
19 km below the surface
Felt
no reports yet
Nearest
Las Piedras Municipio, 5 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 561 days ago

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

How big was it?

This earthquake released about 37 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 410,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 290,000× the energy of this one
  3. Around the size people start to feel M 3.0 26× the energy of this one
  4. This earthquake M 2.1 about 37 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 18.1478, -65.8892. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Las Piedras Municipio, PR 5 km (3 mi) SSW of here earthquakes near Las Piedras Municipio
Juncos Municipio, PR 9 km (5 mi) SSE of here earthquakes near Juncos Municipio
San Lorenzo Municipio, PR 9 km (6 mi) E of here earthquakes near San Lorenzo Municipio
Yabucoa Municipio, PR 10 km (6 mi) NNW of here earthquakes near Yabucoa Municipio
Humacao Municipio, PR 11 km (7 mi) W of here earthquakes near Humacao Municipio
Maunabo Municipio, PR 16 km (10 mi) N of here earthquakes near Maunabo Municipio

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

Aftershocks so far

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

  1. 2.1 4 km S of Palmas, Puerto Rico
  2. 2.6 6 km WSW of Guaynabo, Puerto Rico
  3. 3.0 3 km N of Palomas, Puerto Rico
  4. 3.6 1 km ESE of Carolina, Puerto Rico
  5. 1.8 1 km E of Mariano Colón, Puerto Rico
  6. 1.7 7 km NNE of Yaurel, Puerto Rico
  7. 3.6 1 km SSE of Galateo, Puerto Rico
  8. 2.8 5 km E of Naranjito, Puerto Rico
  9. 2.8 26 km SE of El Negro, Puerto Rico
  10. 2.5 5 km SSE of Bajandas, Puerto Rico
  11. 1.7 2 km E of Arroyo, Puerto Rico
  12. 2.1 5 km SSE of Bajandas, Puerto Rico
  13. 2.6 3 km ESE of Cataño, Puerto Rico
  14. 3.1 1 km S of Campanilla, Puerto Rico
  15. 2.3 1 km SSE of Salinas, 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 4.6 on 2016-12-05 — it released about 6,500 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.