QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

Earthquake near Adjuntas, PR

No earthquake was likely felt in Adjuntas in the 24 hours to 1:35 pm AST (17:35 UTC). The last one was M 3.0, 31 km (19 mi) SSW, at 3:45 am AST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near Adjuntas

This page: a magnitude 2.1 earthquake was recorded 10 km (6 mi) east-southeast of Adjuntas, PR, at 10:03 am AST on 3 July 2017 (14:03 UTC), 19 km deep.

USGS: 9 km ESE of Adjuntas, Puerto Rico

13 km (8 mi) N of Ponce, PR

10:03 am AST, Jul 3, 2017 · · 19 km deep · released about 47 lb of TNT

Every earthquake near Adjuntas Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Jayuya Municipio 12 kmPonce Municipio 14 kmPeñuelas Municipio 14 kmAdjuntas Municipio 14 kmUtuado Municipio 18 kmVillalba Municipio 18 kmGuayanilla Municipio 21 kmJuana Díaz Municipio 21 kmYauco Municipio 23 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
10:03 am AST on 3 July 2017 ()
Where
10 km (6 mi) east-southeast of Adjuntas, PR · earthquakes near Adjuntas
Magnitude
M 2.1 (md)
Depth
19 km below the surface
Felt
no reports yet
Nearest
Jayuya Municipio, 12 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3417 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. In Adjuntas, 10 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Earthquakes near other towns within 30 km: Tallaboa Alta, Peñuelas, Jayuya, Ponce, Coto Laurel, Santo Domingo.

How big was it?

This earthquake released about 47 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 5.8 320,000× 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 20× the energy of this one
  4. This earthquake M 2.1 about 47 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.

For this area

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:

  1. 5.8 12 km N of Garrochales, Puerto Rico · 50 km N of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 18.1196, -66.6423. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Jayuya Municipio, PR 12 km (7 mi) NNE earthquakes near Jayuya Municipio
Ponce Municipio, PR 14 km (8 mi) SSE earthquakes near Ponce Municipio
Peñuelas Municipio, PR 14 km (9 mi) SW earthquakes near Peñuelas Municipio
Adjuntas Municipio, PR 14 km (9 mi) WNW earthquakes near Adjuntas Municipio
Utuado Municipio, PR 18 km (11 mi) NNW earthquakes near Utuado Municipio
Villalba Municipio, PR 18 km (11 mi) E earthquakes near Villalba Municipio

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

Aftershocks so far

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

  1. 1.8 6 km NNW of Sabana Grande, Puerto Rico
  2. 2.2 2 km NW of Tallaboa, Puerto Rico
  3. 2.7 6 km N of Santo Domingo, Puerto Rico
  4. 3.0 0 km ENE of Río Cañas Abajo, Puerto Rico
  5. 2.5 1 km ENE of Salinas, Puerto Rico
  6. 1.9 9 km ESE of Maricao, Puerto Rico
  7. 1.9 2 km SE of Lajas, Puerto Rico
  8. 1.9 22 km S of Guánica, Puerto Rico
  9. 2.0 3 km NW of Sabana Grande, Puerto Rico
  10. 1.7 7 km N of Yauco, Puerto Rico
  11. 1.6 6 km NNE of Lluveras, Puerto Rico
  12. 1.6 6 km SSW of Maricao, Puerto Rico
  13. 2.6 4 km SW of Maricao, Puerto Rico
  14. 1.8 8 km NNW of Yauco, Puerto Rico
  15. 2.0 6 km NW of Sabana Grande, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.