QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

8 km N of Arecibo, Puerto Rico

· 22 km deep · released about 41 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Arecibo Municipio 14 kmHatillo Municipio 14 kmCamuy Municipio 19 kmBarceloneta Municipio 19 kmQuebradillas Municipio 23 kmFlorida Municipio 26 kmManatí Municipio 27 kmUtuado Municipio 31 kmIsabela Municipio 31 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
22 km below the surface
Felt
no reports yet
Nearest
Arecibo Municipio, 14 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1544 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 18.5467, -66.7237. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Arecibo Municipio, PR 14 km (8 mi) NNW of here earthquakes near Arecibo Municipio
Hatillo Municipio, PR 14 km (9 mi) NE of here earthquakes near Hatillo Municipio
Camuy Municipio, PR 19 km (12 mi) NE of here earthquakes near Camuy Municipio
Barceloneta Municipio, PR 19 km (12 mi) WNW of here earthquakes near Barceloneta Municipio
Quebradillas Municipio, PR 23 km (14 mi) ENE of here earthquakes near Quebradillas Municipio
Florida Municipio, PR 26 km (16 mi) NW of here earthquakes near Florida Municipio

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

Aftershocks so far

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

  1. 2.7 4 km SE of Morovis, Puerto Rico
  2. 2.1 10 km SSW of Jayuya, Puerto Rico
  3. 2.4 5 km ESE of Las Marías, Puerto Rico
  4. 2.9 21 km NNW of Camuy, Puerto Rico
  5. 3.2 17 km N of Tierras Nuevas Poniente, Puerto Rico
  6. 3.0 4 km NNW of Vega Baja, Puerto Rico
  7. 2.0 11 km SSE of Lares, Puerto Rico
  8. 1.9 9 km N of Yauco, Puerto Rico
  9. 2.8 14 km NNE of Hatillo, Puerto Rico
  10. 2.4 2 km WNW of San Sebastián, Puerto Rico
  11. 2.9 16 km NNW of San Antonio, Puerto Rico
  12. 2.9 22 km N of Arecibo, Puerto Rico
  13. 2.0 2 km SW of Lares, Puerto Rico
  14. 3.5 3 km S of Animas, Puerto Rico
  15. 2.7 13 km N of Isabela, 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 4.4 on 2018-12-09 — it released about 2,900 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.