QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

7 km ESE of Pole Ojea, Puerto Rico

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

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10 km30 km60 km120 km N Cabo Rojo Municipio 9 kmLajas Municipio 10 kmSan Germán Municipio 21 kmGuánica Municipio 21 kmHormigueros Municipio 22 kmSabana Grande Municipio 25 kmYauco Municipio 32 kmMaricao Municipio 33 kmGuayanilla Municipio 35 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
10 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Cabo Rojo Municipio, 9 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1827 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 1,400 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 17.9398, -67.1231. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cabo Rojo Municipio, PR 9 km (5 mi) SE of here earthquakes near Cabo Rojo Municipio
Lajas Municipio, PR 10 km (6 mi) WSW of here earthquakes near Lajas Municipio
San Germán Municipio, PR 21 km (13 mi) SSW of here earthquakes near San Germán Municipio
Guánica Municipio, PR 21 km (13 mi) W of here earthquakes near Guánica Municipio
Hormigueros Municipio, PR 22 km (13 mi) S of here earthquakes near Hormigueros Municipio
Sabana Grande Municipio, PR 25 km (15 mi) SW of here earthquakes near Sabana Grande Municipio

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

Aftershocks so far

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

  1. 2.0 8 km WSW of Guánica, Puerto Rico
  2. 2.4 8 km SSE of Maria Antonia, Puerto Rico
  3. 2.6 6 km WSW of Guánica, Puerto Rico
  4. 2.2 4 km WSW of Guánica, Puerto Rico
  5. 2.1 9 km SSE of Maria Antonia, Puerto Rico
  6. 2.8 7 km SE of Maria Antonia, Puerto Rico
  7. 2.2 4 km S of Guánica, Puerto Rico
  8. 2.9 3 km WSW of Indios, Puerto Rico
  9. 2.5 2 km SE of Maria Antonia, Puerto Rico
  10. 2.5 8 km SSE of Maria Antonia, Puerto Rico
  11. 2.6 18 km S of Guánica, Puerto Rico
  12. 2.4 10 km SSE of Indios, Puerto Rico
  13. 2.5 8 km SSE of Maria Antonia, Puerto Rico
  14. 2.7 10 km SSE of Indios, Puerto Rico
  15. 2.8 8 km SSE of Indios, 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.