QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

1 km NW of Humacao, Puerto Rico

· 25 km deep · released about 46 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Las Piedras Municipio 5 kmHumacao Municipio 6 kmJuncos Municipio 10 kmYabucoa Municipio 11 kmNaguabo Municipio 12 kmSan Lorenzo Municipio 14 kmMaunabo Municipio 19 kmGurabo Municipio 20 kmCanóvanas Municipio 20 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
25 km below the surface
Felt
no reports yet
Nearest
Las Piedras Municipio, 5 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 642 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 46 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 5.8 330,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 230,000× the energy of this one
  3. Around the size people start to feel M 3.0 21× the energy of this one
  4. This earthquake M 2.1 about 46 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 18.1580, -65.8400. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Las Piedras Municipio, PR 5 km (3 mi) SE of here earthquakes near Las Piedras Municipio
Humacao Municipio, PR 6 km (4 mi) WNW of here earthquakes near Humacao Municipio
Juncos Municipio, PR 10 km (6 mi) SE of here earthquakes near Juncos Municipio
Yabucoa Municipio, PR 11 km (7 mi) N of here earthquakes near Yabucoa Municipio
Naguabo Municipio, PR 12 km (8 mi) WSW of here earthquakes near Naguabo Municipio
San Lorenzo Municipio, PR 14 km (9 mi) E of here earthquakes near San Lorenzo Municipio

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

Aftershocks so far

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

  1. 1.7 7 km NNE of Yaurel, Puerto Rico
  2. 3.6 1 km SSE of Galateo, Puerto Rico
  3. 2.8 5 km E of Naranjito, Puerto Rico
  4. 2.8 26 km SE of El Negro, Puerto Rico
  5. 2.5 5 km SSE of Bajandas, Puerto Rico
  6. 1.7 2 km E of Arroyo, Puerto Rico
  7. 2.1 5 km SSE of Bajandas, Puerto Rico
  8. 2.6 3 km ESE of Cataño, Puerto Rico
  9. 2.4 4 km SW of Las Piedras, Puerto Rico
  10. 2.0 8 km SE of Jobos, Puerto Rico
  11. 2.3 8 km SSE of Jobos, Puerto Rico
  12. 3.1 2 km NW of Hato Candal, Puerto Rico
  13. 3.4 2 km N of Pueblito del Rio, Puerto Rico
  14. 1.6 2 km S of G. L. Garcia, Puerto Rico
  15. 2.2 1 km W of Naranjito, 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 5,200 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.