QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

5 km SSE of Bajandas, Puerto Rico

· 9.9 km deep · released about 46 lb of TNT

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10 km30 km60 km120 km N Humacao Municipio 4 kmYabucoa Municipio 11 kmNaguabo Municipio 12 kmLas Piedras Municipio 14 kmMaunabo Municipio 18 kmJuncos Municipio 20 kmCeiba Municipio 22 kmSan Lorenzo Municipio 23 kmPatillas Municipio 26 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
9.9 km below the surface
Felt
no reports yet
Nearest
Humacao Municipio, 4 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 511 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 46 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 5.8 330,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 230,000× the energy of this one
  3. Around the size people start to feel M 3.0 21× the energy of this one
  4. This earthquake M 2.1 about 46 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 18.1067, -65.7675. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Humacao Municipio, PR 4 km (2 mi) SSE of here earthquakes near Humacao Municipio
Yabucoa Municipio, PR 11 km (7 mi) ENE of here earthquakes near Yabucoa Municipio
Naguabo Municipio, PR 12 km (8 mi) SSW of here earthquakes near Naguabo Municipio
Las Piedras Municipio, PR 14 km (9 mi) SE of here earthquakes near Las Piedras Municipio
Maunabo Municipio, PR 18 km (11 mi) NE of here earthquakes near Maunabo Municipio
Juncos Municipio, PR 20 km (12 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

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

  1. 2.2 11 km SSE of Jobos, Puerto Rico
  2. 3.1 13 km S of Arroyo, Puerto Rico
  3. 2.0 4 km SSW of Arroyo, Puerto Rico
  4. 2.9 1 km WSW of Bayamon, Puerto Rico
  5. 2.4 19 km SE of El Negro, Puerto Rico
  6. 2.9 2 km S of Cayey, Puerto Rico
  7. 1.9 2 km SE of Cidra, Puerto Rico
  8. 1.6 6 km SSE of Lamboglia, Puerto Rico
  9. 2.1 18 km WSW of Esperanza, Puerto Rico
  10. 3.3 16 km WSW of Esperanza, Puerto Rico
  11. 2.5 6 km WNW of Aguas Buenas, Puerto Rico
  12. 2.7 3 km SSE of San Lorenzo, Puerto Rico
  13. 3.5 12 km NNE of Fajardo, Puerto Rico
  14. 2.7 24 km S of Esperanza, Puerto Rico
  15. 2.2 3 km SSE of G. L. Garcia, 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 10,000 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.