QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

60 km S of Santa Isabel, Puerto Rico

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

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Santa Isabel Municipio 59 kmJuana Díaz Municipio 64 kmSalinas Municipio 65 kmPonce Municipio 65 kmGuayama Municipio 71 kmPeñuelas Municipio 72 kmGuayanilla Municipio 73 kmGuánica Municipio 75 kmCoamo Municipio 76 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
11 km below the surface
Felt
no reports yet
Nearest
Santa Isabel Municipio, 59 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 664 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

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 17.4268, -66.4810. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Santa Isabel Municipio, PR 59 km (37 mi) S of here earthquakes near Santa Isabel Municipio
Juana Díaz Municipio, PR 64 km (39 mi) S of here earthquakes near Juana Díaz Municipio
Salinas Municipio, PR 65 km (40 mi) SSW of here earthquakes near Salinas Municipio
Ponce Municipio, PR 65 km (41 mi) SSE of here earthquakes near Ponce Municipio
Guayama Municipio, PR 71 km (44 mi) SSW of here earthquakes near Guayama Municipio
Peñuelas Municipio, PR 72 km (45 mi) SSE of here earthquakes near Peñuelas Municipio

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

Aftershocks so far

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

  1. 2.4 13 km S of Santa Isabel, Puerto Rico
  2. 2.1 36 km SSW of Central Aguirre, Puerto Rico
  3. 2.1 15 km SSW of Potala Pastillo, Puerto Rico
  4. 2.4 16 km SSW of Central Aguirre, Puerto Rico
  5. 3.4 16 km SSW of Central Aguirre, Puerto Rico
  6. 2.9 64 km SSW of Santa Isabel, Puerto Rico
  7. 2.6 25 km S of Jobos, Puerto Rico
  8. 2.6 29 km S of Tallaboa, 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 4.0 on 2020-01-13 — it released about 19 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.