QuakeIndex

Earthquake · reviewed by a seismologist

M 3.8md

9 km SW of Stella, Puerto Rico

· 88 km deep · released about 7.1 tons of TNT

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10 km30 km60 km120 km N Rincón Municipio 10 kmAguada Municipio 18 kmAñasco Municipio 19 kmHormigueros Municipio 25 kmMoca Municipio 27 kmAguadilla Municipio 30 kmCabo Rojo Municipio 33 kmSan Germán Municipio 34 kmLas Marías Municipio 36 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 3.8 (md)
Depth
88 km below the surface
Felt
4 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
USGS impact alert
green
Nearest
Rincón Municipio, 10 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 719 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 4 people have reported feeling it to USGS.

How big was it?

This earthquake released about 7.1 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.8 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 24,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,100× the energy of this one
  3. Magna, Utah 2020 M 5.7 760× the energy of this one
  4. This earthquake M 3.8 about 7.1 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 15× more

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 18.2680, -67.3118. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Rincón Municipio, PR 10 km (6 mi) SW of here earthquakes near Rincón Municipio
Aguada Municipio, PR 18 km (11 mi) SW of here earthquakes near Aguada Municipio
Añasco Municipio, PR 19 km (12 mi) W of here earthquakes near Añasco Municipio
Hormigueros Municipio, PR 25 km (16 mi) NW of here earthquakes near Hormigueros Municipio
Moca Municipio, PR 27 km (17 mi) WSW of here earthquakes near Moca Municipio
Aguadilla Municipio, PR 30 km (18 mi) SW of here earthquakes near Aguadilla Municipio

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

Aftershocks so far

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

  1. 2.4 7 km SW of La Parguera, Puerto Rico
  2. 2.4 5 km WSW of Liborio Negron Torres, Puerto Rico
  3. 2.5 6 km E of La Parguera, Puerto Rico
  4. 3.0 5 km SW of Liborio Negron Torres, Puerto Rico
  5. 3.2 25 km WSW of Stella, Puerto Rico
  6. 2.4 6 km W of Maricao, Puerto Rico
  7. 1.5 2 km NW of Las Marias, Puerto Rico
  8. 2.5 4 km WNW of San Sebastián, Puerto Rico
  9. 2.7 9 km SW of La Parguera, Puerto Rico
  10. 2.3 5 km ESE of Lajas, Puerto Rico
  11. 3.0 33 km WNW of Rincón, Puerto Rico
  12. 2.4 1 km ESE of La Parguera, Puerto Rico
  13. 3.0 7 km ESE of La Parguera, Puerto Rico
  14. 2.8 5 km ENE of Maricao, Puerto Rico
  15. 2.8 7 km S of Lares, 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 4.9 on 2020-07-03 — it released about 48 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.