QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

36 km SSW of Central Aguirre, Puerto Rico

· 20 km deep · released about 41 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Santa Isabel Municipio 36 kmSalinas Municipio 38 kmGuayama Municipio 42 kmJuana Díaz Municipio 44 kmArroyo Municipio 47 kmPonce Municipio 51 kmCoamo Municipio 52 kmPatillas Municipio 53 kmCayey Municipio 55 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 2.1 (md)
Depth
20 km below the surface
Felt
no reports yet
Nearest
Santa Isabel Municipio, 36 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 394 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 41 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 370,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 260,000× the energy of this one
  3. Around the size people start to feel M 3.0 23× the energy of this one
  4. This earthquake M 2.1 about 41 lb of TNT

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 17.6365, -66.3132. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Santa Isabel Municipio, PR 36 km (22 mi) SSE of here earthquakes near Santa Isabel Municipio
Salinas Municipio, PR 38 km (23 mi) S of here earthquakes near Salinas Municipio
Guayama Municipio, PR 42 km (26 mi) SSW of here earthquakes near Guayama Municipio
Juana Díaz Municipio, PR 44 km (28 mi) SSE of here earthquakes near Juana Díaz Municipio
Arroyo Municipio, PR 47 km (29 mi) SW of here earthquakes near Arroyo Municipio
Ponce Municipio, PR 51 km (32 mi) SE of here earthquakes near Ponce Municipio

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

Aftershocks so far

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

  1. 1.5 1 km SE of Salinas, Puerto Rico
  2. 1.6 6 km SSE of Lamboglia, Puerto Rico
  3. 2.3 9 km SSE of Tallaboa, Puerto Rico
  4. 2.8 10 km S of Santa Isabel, Puerto Rico
  5. 2.6 10 km S of Santa Isabel, Puerto Rico
  6. 2.8 9 km S of Santa Isabel, Puerto Rico
  7. 2.4 13 km S of Santa Isabel, Puerto Rico
  8. 2.3 10 km SSE of Tallaboa, Puerto Rico
  9. 2.5 3 km S of Salinas, 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 5.0 on 2020-01-07 — it released about 23,000 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.