QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

8 km ESE of Comunas, Puerto Rico

· 20 km deep · released about 43 lb of TNT

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10 km30 km60 km120 km N Humacao Municipio 9 kmYabucoa Municipio 10 kmMaunabo Municipio 15 kmNaguabo Municipio 18 kmLas Piedras Municipio 18 kmJuncos Municipio 24 kmPatillas Municipio 24 kmSan Lorenzo Municipio 24 kmCeiba Municipio 27 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
Humacao Municipio, 9 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 294 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 43 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 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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 18.0565, -65.7695. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Humacao Municipio, PR 9 km (6 mi) SSE of here earthquakes near Humacao Municipio
Yabucoa Municipio, PR 10 km (6 mi) E of here earthquakes near Yabucoa Municipio
Maunabo Municipio, PR 15 km (9 mi) ENE of here earthquakes near Maunabo Municipio
Naguabo Municipio, PR 18 km (11 mi) SSW of here earthquakes near Naguabo Municipio
Las Piedras Municipio, PR 18 km (11 mi) SE of here earthquakes near Las Piedras Municipio
Juncos Municipio, PR 24 km (15 mi) SE of here earthquakes near Juncos Municipio

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

Aftershocks so far

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

  1. 2.5 11 km SSE of Esperanza, Puerto Rico
  2. 2.9 21 km SW of Esperanza, Puerto Rico
  3. 3.7 29 km SSW of Esperanza, Puerto Rico
  4. 2.7 3 km SE of Jobos, Puerto Rico
  5. 1.5 1 km NE of Vázquez, Puerto Rico
  6. 2.1 1 km SE of Aguas Buenas, Puerto Rico
  7. 1.6 2 km ESE of Jobos, Puerto Rico
  8. 2.1 2 km SE of Jobos, Puerto Rico
  9. 2.5 1 km W of Santa Clara, Puerto Rico
  10. 2.6 2 km WSW of G. L. Garcia, Puerto Rico
  11. 2.0 11 km SSE of Punta Santiago, Puerto Rico
  12. 2.0 0 km WSW of Aguas Buenas, Puerto Rico
  13. 1.9 0 km SW of G. L. Garcia, Puerto Rico
  14. 2.6 26 km SE of El Negro, Puerto Rico
  15. 3.0 30 km SSW of Esperanza, 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 4.8 on 2021-10-08 — it released about 11,000 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.