QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

12 km S of Jobos, Puerto Rico

· 12 km deep · released about 40 lb of TNT

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10 km30 km60 km120 km N Guayama Municipio 15 kmSalinas Municipio 17 kmArroyo Municipio 19 kmPatillas Municipio 26 kmSanta Isabel Municipio 26 kmCayey Municipio 29 kmAibonito Municipio 33 kmMaunabo Municipio 33 kmCoamo Municipio 35 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
12 km below the surface
Felt
no reports yet
Nearest
Guayama Municipio, 15 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3016 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 40 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 5.8 380,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 270,000× the energy of this one
  3. Around the size people start to feel M 3.0 24× the energy of this one
  4. This earthquake M 2.1 about 40 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 17.8458, -66.1671. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Guayama Municipio, PR 15 km (9 mi) SSW of here earthquakes near Guayama Municipio
Salinas Municipio, PR 17 km (11 mi) SE of here earthquakes near Salinas Municipio
Arroyo Municipio, PR 19 km (12 mi) SW of here earthquakes near Arroyo Municipio
Patillas Municipio, PR 26 km (16 mi) SW of here earthquakes near Patillas Municipio
Santa Isabel Municipio, PR 26 km (16 mi) ESE of here earthquakes near Santa Isabel Municipio
Cayey Municipio, PR 29 km (18 mi) S of here earthquakes near Cayey Municipio

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

Aftershocks so far

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

  1. 2.1 2 km SSE of Ponce, Puerto Rico
  2. 1.9 1 km N of Las Ochenta, Puerto Rico
  3. 2.2 5 km ESE of G. L. Garcia, Puerto Rico
  4. 2.0 0 km NW of Playita Cortada, Puerto Rico
  5. 2.2 1 km ESE of Potala Pastillo, Puerto Rico
  6. 2.1 3 km ESE of Cayey, Puerto Rico
  7. 2.4 2 km SSE of Cidra, Puerto Rico
  8. 2.5 17 km SSE of Jobos, Puerto Rico
  9. 2.5 3 km WSW of Sumidero, Puerto Rico
  10. 2.1 11 km SSW of Potala Pastillo, Puerto Rico
  11. 1.5 3 km W of Palo Seco, Puerto Rico
  12. 1.6 9 km S of Emajagua, Puerto Rico
  13. 2.1 8 km S of Emajagua, Puerto Rico
  14. 2.2 2 km ESE of Parcelas Nuevas, Puerto Rico
  15. 1.9 5 km SW of Playita Cortada, 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 4.6 on 2016-12-05 — it released about 6,000 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.