QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

2 km SE of Cidra, Puerto Rico

· 29 km deep · released about 24 lb of TNT

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10 km30 km60 km120 km N Cidra Municipio 3 kmCayey Municipio 6 kmComerío Municipio 11 kmAguas Buenas Municipio 12 kmCaguas Municipio 12 kmAibonito Municipio 13 kmSan Lorenzo Municipio 18 kmBarranquitas Municipio 18 kmNaranjito 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 1.9 (md)
Depth
29 km below the surface
Felt
no reports yet
Nearest
Cidra Municipio, 3 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 361 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 24 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 640,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 450,000× the energy of this one
  3. Around the size people start to feel M 3.0 40× the energy of this one
  4. This earthquake M 1.9 about 24 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 18.1540, -66.1457. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cidra Municipio, PR 3 km (2 mi) SE of here earthquakes near Cidra Municipio
Cayey Municipio, PR 6 km (4 mi) N of here earthquakes near Cayey Municipio
Comerío Municipio, PR 11 km (7 mi) SE of here earthquakes near Comerío Municipio
Aguas Buenas Municipio, PR 12 km (7 mi) S of here earthquakes near Aguas Buenas Municipio
Caguas Municipio, PR 12 km (7 mi) WSW of here earthquakes near Caguas Municipio
Aibonito Municipio, PR 13 km (8 mi) ENE of here earthquakes near Aibonito Municipio

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

Aftershocks so far

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

  1. 1.9 4 km SE of Jagual, Puerto Rico
  2. 2.6 5 km NNW of Aguas Buenas, Puerto Rico
  3. 2.7 5 km WSW of Central Aguirre, Puerto Rico
  4. 2.1 5 km WSW of Central Aguirre, Puerto Rico
  5. 2.3 2 km S of G. L. Garcia, Puerto Rico
  6. 1.9 1 km ENE of Cayey, Puerto Rico
  7. 1.8 2 km E of Cayey, Puerto Rico
  8. 3.1 2 km NE of Bayamón, Puerto Rico
  9. 3.1 1 km SSE of Guaynabo, Puerto Rico
  10. 1.9 1 km E of Cayey, Puerto Rico
  11. 1.8 3 km NNE of Jobos, Puerto Rico
  12. 2.4 2 km WSW of Coto Laurel, Puerto Rico
  13. 2.1 1 km SSE of Santa Isabel, Puerto Rico
  14. 3.3 5 km NNE of Aguas Buenas, Puerto Rico
  15. 1.9 3 km E of G. L. Garcia, 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 10,000 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.