QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

2 km SSE of Magas Arriba, Puerto Rico

· 12 km deep · released about 1,400 lb of TNT

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10 km30 km60 km120 km N Guayanilla Municipio 4 kmPeñuelas Municipio 5 kmYauco Municipio 14 kmPonce Municipio 16 kmGuánica Municipio 18 kmAdjuntas Municipio 21 kmSabana Grande Municipio 22 kmMaricao Municipio 27 kmJuana Díaz Municipio 28 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
12 km below the surface
Felt
2 reports · strongest reported intensity III
Nearest
Guayanilla Municipio, 4 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2234 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,400 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 6.7 240,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,700× the energy of this one
  4. This earthquake M 3.1 about 1,400 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.5× 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 17.9958, -66.7588. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Guayanilla Municipio, PR 4 km (3 mi) ESE of here earthquakes near Guayanilla Municipio
Peñuelas Municipio, PR 5 km (3 mi) SW of here earthquakes near Peñuelas Municipio
Yauco Municipio, PR 14 km (9 mi) SE of here earthquakes near Yauco Municipio
Ponce Municipio, PR 16 km (10 mi) W of here earthquakes near Ponce Municipio
Guánica Municipio, PR 18 km (11 mi) ENE of here earthquakes near Guánica Municipio
Adjuntas Municipio, PR 21 km (13 mi) S of here earthquakes near Adjuntas Municipio

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

Aftershocks so far

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

  1. 3.3 4 km WSW of Guánica, Puerto Rico
  2. 2.8 3 km SSE of Maria Antonia, Puerto Rico
  3. 2.8 0 km NE of Guayanilla, Puerto Rico
  4. 2.7 9 km SSW of Tallaboa, Puerto Rico
  5. 1.6 5 km SW of Guánica, Puerto Rico
  6. 2.7 3 km SW of Indios, Puerto Rico
  7. 3.1 3 km SSE of Maria Antonia, Puerto Rico
  8. 3.4 3 km WSW of Guánica, Puerto Rico
  9. 2.4 3 km SSW of Indios, Puerto Rico
  10. 2.0 3 km SSW of Indios, Puerto Rico
  11. 2.0 4 km SSW of Indios, Puerto Rico
  12. 3.0 6 km WSW of La Parguera, Puerto Rico
  13. 2.2 6 km SSW of Guánica, Puerto Rico
  14. 2.4 3 km WSW of Fuig, Puerto Rico
  15. 2.4 1 km NW of Magas Arriba, 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 86,000 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.