QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

1 km NW of Cidra, Puerto Rico

· 30 km deep · released about 460 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cidra Municipio 1 kmComerío Municipio 7 kmCayey Municipio 9 kmAguas Buenas Municipio 9 kmAibonito Municipio 12 kmCaguas Municipio 13 kmNaranjito Municipio 15 kmBarranquitas Municipio 15 kmBayamón 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 2.8 (md)
Depth
30 km below the surface
Felt
no reports yet
Nearest
Cidra Municipio, 1 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1889 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 460 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 33,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 23,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.1× the energy of this one
  4. This earthquake M 2.8 about 460 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 18.1841, -66.1696. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cidra Municipio, PR 1 km (1 mi) NW of here earthquakes near Cidra Municipio
Comerío Municipio, PR 7 km (4 mi) SE of here earthquakes near Comerío Municipio
Cayey Municipio, PR 9 km (6 mi) NNW of here earthquakes near Cayey Municipio
Aguas Buenas Municipio, PR 9 km (6 mi) SSW of here earthquakes near Aguas Buenas Municipio
Aibonito Municipio, PR 12 km (7 mi) ENE of here earthquakes near Aibonito Municipio
Caguas Municipio, PR 13 km (8 mi) WSW of here earthquakes near Caguas Municipio

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

Aftershocks so far

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

  1. 2.5 2 km SSW of Salinas, Puerto Rico
  2. 3.6 2 km ESE of Pájaros, Puerto Rico
  3. 3.1 3 km ESE of Salinas, Puerto Rico
  4. 3.4 4 km ESE of Salinas, Puerto Rico
  5. 3.4 3 km ESE of Salinas, Puerto Rico
  6. 3.3 1 km SW of Cayey, Puerto Rico
  7. 2.8 1 km SSW of Cayey, Puerto Rico
  8. 3.0 2 km SW of Canovanas, Puerto Rico
  9. 2.0 5 km S of Morovis, Puerto Rico
  10. 2.7 0 km NW of Aguas Buenas, Puerto Rico
  11. 2.5 1 km SE of Salinas, Puerto Rico
  12. 2.7 2 km W of Pastos, Puerto Rico
  13. 2.8 12 km N of San Juan, Puerto Rico
  14. 3.3 4 km SSW of Las Piedras, Puerto Rico
  15. 2.4 2 km NNW of Potala Pastillo, 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 520 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.