QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

3 km NNE of Mayagüez, Puerto Rico

· 80 km deep · released about 1,500 lb of TNT

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10 km30 km60 km120 km N Añasco Municipio 6 kmHormigueros Municipio 11 kmLas Marías Municipio 16 kmMoca Municipio 17 kmAguada Municipio 17 kmSan Germán Municipio 17 kmRincón Municipio 17 kmSan Sebastián Municipio 20 kmMaricao Municipio 22 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 3.1 (md)
Depth
80 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Añasco Municipio, 6 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 920 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 1,500 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 220,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 9,800× the energy of this one
  3. Magna, Utah 2020 M 5.7 6,900× the energy of this one
  4. This earthquake M 3.1 about 1,500 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.6× 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 18.2343, -67.1292. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Añasco Municipio, PR 6 km (4 mi) S of here earthquakes near Añasco Municipio
Hormigueros Municipio, PR 11 km (7 mi) N of here earthquakes near Hormigueros Municipio
Las Marías Municipio, PR 16 km (10 mi) W of here earthquakes near Las Marías Municipio
Moca Municipio, PR 17 km (10 mi) SSW of here earthquakes near Moca Municipio
Aguada Municipio, PR 17 km (10 mi) SSE of here earthquakes near Aguada Municipio
San Germán Municipio, PR 17 km (11 mi) NW of here earthquakes near San Germán Municipio

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

Aftershocks so far

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

  1. 2.1 12 km SSE of Guánica, Puerto Rico
  2. 1.6 4 km E of La Parguera, Puerto Rico
  3. 2.4 2 km NNW of Indios, Puerto Rico
  4. 2.3 6 km SSE of Maria Antonia, Puerto Rico
  5. 3.1 5 km WSW of Guánica, Puerto Rico
  6. 2.1 3 km NW of Fuig, Puerto Rico
  7. 2.5 1 km SW of Indios, Puerto Rico
  8. 2.2 6 km SW of La Parguera, Puerto Rico
  9. 2.0 2 km N of Indios, Puerto Rico
  10. 3.1 8 km SSW of La Playa, Puerto Rico
  11. 2.5 2 km SSW of Peñuelas, Puerto Rico
  12. 3.1 3 km WSW of Indios, Puerto Rico
  13. 3.0 8 km SSW of Guánica, Puerto Rico
  14. 3.0 6 km SSE of Maria Antonia, Puerto Rico
  15. 2.2 10 km SSE of Maria Antonia, 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 6.4 on 2020-01-07 — it released about 78,000 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.