QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1Md

1 km WSW of Río Blanco, Puerto Rico

· 45 km deep · released about 43 lb of TNT

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10 km30 km60 km120 km N Naguabo Municipio 7 kmLas Piedras Municipio 8 kmHumacao Municipio 9 kmJuncos Municipio 11 kmCanóvanas Municipio 16 kmYabucoa Municipio 18 kmRío Grande Municipio 18 kmCeiba Municipio 20 kmSan Lorenzo Municipio 20 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
45 km below the surface
Felt
no reports yet
Nearest
Naguabo Municipio, 7 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3605 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 18.2117, -65.8013. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Naguabo Municipio, PR 7 km (4 mi) W of here earthquakes near Naguabo Municipio
Las Piedras Municipio, PR 8 km (5 mi) ENE of here earthquakes near Las Piedras Municipio
Humacao Municipio, PR 9 km (5 mi) N of here earthquakes near Humacao Municipio
Juncos Municipio, PR 11 km (7 mi) E of here earthquakes near Juncos Municipio
Canóvanas Municipio, PR 16 km (10 mi) SE of here earthquakes near Canóvanas Municipio
Yabucoa Municipio, PR 18 km (11 mi) NNE of here earthquakes near Yabucoa Municipio

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

Aftershocks so far

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

  1. 2.4 9 km S of Emajagua, Puerto Rico
  2. 2.4 11 km S of Emajagua, Puerto Rico
  3. 2.1 10 km S of Emajagua, Puerto Rico
  4. 2.2 9 km N of Loíza, Puerto Rico
  5. 1.5 9 km S of Emajagua, Puerto Rico
  6. 1.8 6 km SE of Lamboglia, Puerto Rico
  7. 2.2 7 km SSW of Emajagua, Puerto Rico
  8. 2.1 11 km S of Emajagua, Puerto Rico
  9. 1.9 9 km S of Emajagua, Puerto Rico
  10. 2.5 9 km S of Emajagua, Puerto Rico
  11. 2.3 11 km S of Emajagua, Puerto Rico
  12. 2.3 11 km S of Emajagua, Puerto Rico
  13. 1.8 12 km S of Emajagua, Puerto Rico
  14. 2.4 11 km S of Emajagua, Puerto Rico
  15. 2.0 10 km S of Emajagua, 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 4.3 on 2016-09-02 — it released about 2,000 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.