QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

0 km SW of Toa Alta, Puerto Rico

· 63 km deep · released about 49 lb of TNT

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10 km30 km60 km120 km N Toa Alta Municipio 2 kmBayamón Municipio 10 kmDorado Municipio 10 kmToa Baja Municipio 10 kmNaranjito Municipio 10 kmVega Alta Municipio 10 kmCorozal Municipio 12 kmCataño Municipio 13 kmGuaynabo Municipio 15 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
63 km below the surface
Felt
no reports yet
Nearest
Toa Alta Municipio, 2 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2812 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 49 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 5.8 310,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 220,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 49 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 18.3836, -66.2540. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Toa Alta Municipio, PR 2 km (1 mi) NNW of here earthquakes near Toa Alta Municipio
Bayamón Municipio, PR 10 km (6 mi) WNW of here earthquakes near Bayamón Municipio
Dorado Municipio, PR 10 km (6 mi) S of here earthquakes near Dorado Municipio
Toa Baja Municipio, PR 10 km (6 mi) SW of here earthquakes near Toa Baja Municipio
Naranjito Municipio, PR 10 km (6 mi) N of here earthquakes near Naranjito Municipio
Vega Alta Municipio, PR 10 km (7 mi) SE of here earthquakes near Vega Alta Municipio

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

Aftershocks so far

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

  1. 2.5 9 km N of Animas, Puerto Rico
  2. 2.9 3 km N of Naranjito, Puerto Rico
  3. 1.6 1 km ESE of Los Llanos, Puerto Rico
  4. 1.9 1 km W of Jauca, Puerto Rico
  5. 1.6 1 km NNW of Jayuya, Puerto Rico
  6. 1.9 4 km N of Palmarejo, Puerto Rico
  7. 1.9 1 km ENE of El Ojo, Puerto Rico
  8. 2.2 26 km N of Dorado, Puerto Rico
  9. 2.5 31 km N of Brenas, Puerto Rico
  10. 2.0 0 km SSE of Playita Cortada, Puerto Rico
  11. 2.6 37 km N of Tierras Nuevas Poniente, Puerto Rico
  12. 2.3 4 km NW of Palomas, Puerto Rico
  13. 2.3 Puerto Rico region
  14. 2.3 6 km NE of Villalba, Puerto Rico
  15. 1.9 24 km NNE of Tierras Nuevas Poniente, 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 2,500 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.