QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9md

81 km N of San Juan, Puerto Rico

· 20 km deep · released about 570 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Loíza Municipio 84 kmDorado Municipio 84 kmToa Baja Municipio 84 kmCataño Municipio 85 kmSan Juan Municipio 86 kmCarolina Municipio 89 kmVega Alta Municipio 91 kmVega Baja Municipio 91 kmRío Grande Municipio 94 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 2.9 (md)
Depth
20 km below the surface
Felt
no reports yet
Nearest
Loíza Municipio, 84 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2705 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 570 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 27,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 19,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.7× the energy of this one
  4. This earthquake M 2.9 about 570 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 19.1953, -66.0208. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loíza Municipio, PR 84 km (52 mi) N of here earthquakes near Loíza Municipio
Dorado Municipio, PR 84 km (52 mi) NNE of here earthquakes near Dorado Municipio
Toa Baja Municipio, PR 84 km (52 mi) NNE of here earthquakes near Toa Baja Municipio
Cataño Municipio, PR 85 km (53 mi) N of here earthquakes near Cataño Municipio
San Juan Municipio, PR 86 km (54 mi) N of here earthquakes near San Juan Municipio
Carolina Municipio, PR 89 km (55 mi) N of here earthquakes near Carolina Municipio

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

Aftershocks so far

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

  1. 2.7 118 km N of Suárez, Puerto Rico
  2. 2.7 87 km N of Brenas, Puerto Rico
  3. 2.1 115 km NNE of San Juan, Puerto Rico
  4. 1.9 64 km NNE of San Juan, Puerto Rico
  5. 3.1 74 km N of San Juan, Puerto Rico
  6. 2.5 91 km N of Brenas, Puerto Rico
  7. 2.2 71 km N of Tierras Nuevas Poniente, Puerto Rico
  8. 2.1 54 km N of San Juan, Puerto Rico
  9. 2.6 55 km N of Brenas, Puerto Rico
  10. 2.8 68 km N of Brenas, Puerto Rico
  11. 2.8 78 km N of San Juan, Puerto Rico
  12. 2.4 69 km N of Tierras Nuevas Poniente, Puerto Rico
  13. 3.2 114 km N of Brenas, Puerto Rico
  14. 2.6 49 km N of Brenas, Puerto Rico
  15. 3.0 110 km N of San Juan, 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 4.8 on 2017-08-18 — it released about 840 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.