QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

3 km SE of Cayey, Puerto Rico

· 8.0 km deep · released about 7.8 lb of TNT

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10 km30 km60 km120 km N Cayey Municipio 2 kmCidra Municipio 10 kmGuayama Municipio 13 kmAibonito Municipio 13 kmCaguas Municipio 17 kmArroyo Municipio 17 kmComerío Municipio 17 kmSalinas Municipio 18 kmAguas Buenas Municipio 19 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 1.6 (md)
Depth
8.0 km below the surface
Felt
no reports yet
Nearest
Cayey Municipio, 2 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2744 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 7.8 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
  3. Around the size people start to feel M 3.0 120× the energy of this one
  4. This earthquake M 1.6 about 7.8 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 18.0891, -66.1446. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cayey Municipio, PR 2 km (1 mi) SSE of here earthquakes near Cayey Municipio
Cidra Municipio, PR 10 km (6 mi) S of here earthquakes near Cidra Municipio
Guayama Municipio, PR 13 km (8 mi) N of here earthquakes near Guayama Municipio
Aibonito Municipio, PR 13 km (8 mi) ESE of here earthquakes near Aibonito Municipio
Caguas Municipio, PR 17 km (10 mi) SW of here earthquakes near Caguas Municipio
Arroyo Municipio, PR 17 km (11 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

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

  1. 4.1 5 km SSE of El Negro, Puerto Rico
  2. 2.1 1 km NNE of El Negro, Puerto Rico
  3. 2.1 5 km S of Palo Seco, Puerto Rico
  4. 1.9 6 km SE of Lamboglia, Puerto Rico
  5. 2.3 8 km SE of Lamboglia, Puerto Rico
  6. 1.9 9 km SE of Lamboglia, Puerto Rico
  7. 2.1 1 km WSW of Los Llanos, Puerto Rico
  8. 2.5 2 km ENE of Pájaros, Puerto Rico
  9. 1.5 5 km NW of Coamo, Puerto Rico
  10. 1.8 0 km SSE of Jobos, Puerto Rico
  11. 1.9 2 km S of Barahona, Puerto Rico
  12. 2.1 5 km NNE of Dorado, Puerto Rico
  13. 1.9 1 km E of Jauca, Puerto Rico
  14. 1.6 5 km SSE of Arroyo, Puerto Rico
  15. 2.5 1 km ESE of Toa Baja, 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 31,000 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.