QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

3 km ESE of Cayey, Puerto Rico

· 25 km deep · released about 49 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cayey Municipio 2 kmCidra Municipio 9 kmGuayama Municipio 13 kmAibonito Municipio 14 kmCaguas Municipio 16 kmArroyo Municipio 17 kmComerío Municipio 17 kmSan Lorenzo Municipio 18 kmAguas Buenas 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
25 km below the surface
Felt
no reports yet
Nearest
Cayey Municipio, 2 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2861 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 49 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 5.8 310,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 220,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 49 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 18.0946, -66.1341. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cayey Municipio, PR 2 km (1 mi) ESE of here earthquakes near Cayey Municipio
Cidra Municipio, PR 9 km (6 mi) SSE of here earthquakes near Cidra Municipio
Guayama Municipio, PR 13 km (8 mi) N of here earthquakes near Guayama Municipio
Aibonito Municipio, PR 14 km (9 mi) ESE of here earthquakes near Aibonito Municipio
Caguas Municipio, PR 16 km (10 mi) SW of here earthquakes near Caguas Municipio
Arroyo Municipio, PR 17 km (10 mi) NW of here earthquakes near Arroyo 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. 2.0 7 km SE of Arroyo, Puerto Rico
  2. 2.1 4 km ESE of Palmarejo, Puerto Rico
  3. 2.0 Puerto Rico region
  4. 2.0 3 km SSW of Jauca, Puerto Rico
  5. 2.3 2 km SSW of Jauca, Puerto Rico
  6. 2.0 2 km SSW of Jauca, Puerto Rico
  7. 2.0 2 km SE of Santa Isabel, Puerto Rico
  8. 2.1 1 km SSE of G. L. Garcia, Puerto Rico
  9. 2.1 6 km NNW of Loíza, Puerto Rico
  10. 1.6 3 km NNW of Playita Cortada, Puerto Rico
  11. 2.5 11 km S of Emajagua, Puerto Rico
  12. 1.9 2 km S of Las Ochenta, Puerto Rico
  13. 2.4 5 km SSW of Central Aguirre, Puerto Rico
  14. 1.6 9 km W of Orocovis, Puerto Rico
  15. 1.5 1 km SE of Santa Isabel, 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 4,900 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.