QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

Earthquake near Jobos, PR

No earthquake was likely felt in Jobos in the 24 hours to 5:22 pm AST (21:22 UTC). The last one was M 3.0, 28 km (18 mi) WSW, at 7:09 pm AST on 5 November 2026, estimated intensity II (weak) in town. Every earthquake near Jobos

This page: a magnitude 2.1 earthquake was recorded 12 km (8 mi) south of Jobos, PR, at 10:47 pm AST on 24 June 2018 (02:47 UTC), 12 km deep.

USGS: 12 km S of Jobos, Puerto Rico

63 km (39 mi) S of San Juan, PR · 45 km (28 mi) SSW of Caguas, PR

10:47 pm AST, Jun 24, 2018 · · 12 km deep · released about 40 lb of TNT

Every earthquake near Jobos Felt it? Tell USGS Check my area
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
10:47 pm AST on 24 June 2018 ()
Where
12 km (8 mi) south of Jobos, PR · earthquakes near Jobos
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 3062 days ago

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

At this magnitude and depth, people at rest would likely notice it out to about 12 km (7 mi) from the epicentre. In Jobos, 12 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: Central Aguirre, Coquí, Guayama, Arroyo, Olimpo, Corazón.

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.

For this area

The largest earthquake within 50 km since 2016 was M 4.6 on 2016-12-05 — about 6,000 times the energy of this one.

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

  1. 5.1 3 km W of Aguas Buenas, Puerto Rico · 46 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 17.8458, -66.1671. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Guayama Municipio, PR 15 km (9 mi) NNE earthquakes near Guayama Municipio
Salinas Municipio, PR 17 km (11 mi) NW earthquakes near Salinas Municipio
Arroyo Municipio, PR 19 km (12 mi) NE earthquakes near Arroyo Municipio
Patillas Municipio, PR 26 km (16 mi) NE earthquakes near Patillas Municipio
Santa Isabel Municipio, PR 26 km (16 mi) WNW earthquakes near Santa Isabel Municipio
Cayey Municipio, PR 29 km (18 mi) N 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.

On USGS

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