QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

8 km SE of Emajagua, Puerto Rico

· 15 km deep · released about 46 lb of TNT

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10 km30 km60 km120 km N Maunabo Municipio 9 kmYabucoa Municipio 14 kmPatillas Municipio 17 kmArroyo Municipio 22 kmHumacao Municipio 23 kmSan Lorenzo Municipio 27 kmLas Piedras Municipio 28 kmGuayama Municipio 32 kmNaguabo Municipio 32 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
15 km below the surface
Felt
no reports yet
Nearest
Maunabo Municipio, 9 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 141 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 17.9382, -65.8387. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Maunabo Municipio, PR 9 km (6 mi) SE of here earthquakes near Maunabo Municipio
Yabucoa Municipio, PR 14 km (9 mi) S of here earthquakes near Yabucoa Municipio
Patillas Municipio, PR 17 km (11 mi) ESE of here earthquakes near Patillas Municipio
Arroyo Municipio, PR 22 km (14 mi) E of here earthquakes near Arroyo Municipio
Humacao Municipio, PR 23 km (14 mi) SSW of here earthquakes near Humacao Municipio
San Lorenzo Municipio, PR 27 km (17 mi) SSE of here earthquakes near San Lorenzo Municipio

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

Aftershocks so far

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

  1. 2.5 6 km SSE of Salinas, Puerto Rico
  2. 3.1 12 km SE of Emajagua, Puerto Rico
  3. 3.1 16 km SE of Esperanza, Puerto Rico
  4. 3.1 2 km SW of Hato Candal, Puerto Rico
  5. 3.1 14 km SSE of Esperanza, Puerto Rico
  6. 2.9 17 km S of Esperanza, Puerto Rico
  7. 2.9 16 km SSE of Esperanza, Puerto Rico
  8. 2.7 24 km SE of Emajagua, Puerto Rico
  9. 2.3 5 km NNW of Coco, Puerto Rico
  10. 2.1 10 km E of El Negro, Puerto Rico
  11. 3.2 11 km SSE of Punta Santiago, Puerto Rico
  12. 2.1 5 km SSE of Bajandas, Puerto Rico
  13. 2.1 3 km NE of La Plena, Puerto Rico
  14. 1.9 5 km SSE of Salinas, Puerto Rico
  15. 3.0 6 km SE of Isabel Segunda, 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.