QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9md

36 km NNW of San Antonio, Puerto Rico

· 8.0 km deep · released about 680 lb of TNT

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10 km30 km60 km120 km N Aguadilla Municipio 36 kmIsabela Municipio 42 kmAguada Municipio 46 kmMoca Municipio 49 kmRincón Municipio 49 kmQuebradillas Municipio 50 kmCamuy Municipio 56 kmAñasco Municipio 57 kmSan Sebastián Municipio 59 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
8.0 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Aguadilla Municipio, 36 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 805 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 680 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 22,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 16,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.4× the energy of this one
  4. This earthquake M 2.9 about 680 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 18.7840, -67.2580. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aguadilla Municipio, PR 36 km (22 mi) NNW of here earthquakes near Aguadilla Municipio
Isabela Municipio, PR 42 km (26 mi) NW of here earthquakes near Isabela Municipio
Aguada Municipio, PR 46 km (29 mi) N of here earthquakes near Aguada Municipio
Moca Municipio, PR 49 km (30 mi) NNW of here earthquakes near Moca Municipio
Rincón Municipio, PR 49 km (31 mi) N of here earthquakes near Rincón Municipio
Quebradillas Municipio, PR 50 km (31 mi) NW of here earthquakes near Quebradillas Municipio

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

Aftershocks so far

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

  1. 3.4 14 km WNW of Rincón, Puerto Rico
  2. 3.2 5 km SSE of Mora, Puerto Rico
  3. 2.9 24 km WNW of Rincón, Puerto Rico
  4. 3.5 54 km N of Hatillo, Puerto Rico
  5. 3.1 40 km NNW of San Antonio, Puerto Rico
  6. 3.6 0 km S of Rafael Hernandez, Puerto Rico
  7. 3.0 19 km NNW of Camuy, Puerto Rico
  8. 3.6 51 km N of Hatillo, Puerto Rico
  9. 3.3 57 km NNE of Isabela, Puerto Rico
  10. 3.1 35 km NW of Rincón, Puerto Rico
  11. 3.4 16 km WNW of Rincón, Puerto Rico
  12. 3.1 55 km NNW of San Antonio, Puerto Rico
  13. 2.8 28 km NW of San Antonio, Puerto Rico
  14. 3.2 55 km NW of San Antonio, Puerto Rico
  15. 3.1 32 km NNW of Isabela, 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 6.0 on 2019-09-24 — it released about 45,000 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.