QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

Earthquake near Jobos, PR

No earthquake was likely felt in Jobos in the 24 hours to 3:25 am AST (07:25 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 2.5 earthquake was recorded 13 km (8 mi) south of Jobos, PR, at 10:07 pm AST on 29 April 2018 (02:07 UTC), 13 km deep.

USGS: 13 km S of Jobos, Puerto Rico

64 km (40 mi) S of San Juan, PR · 46 km (29 mi) SSW of Caguas, PR

10:07 pm AST, Apr 29, 2018 · · 13 km deep · released about 190 lb of TNT

Every earthquake near Jobos Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Guayama Municipio 16 kmSalinas Municipio 18 kmArroyo Municipio 20 kmPatillas Municipio 26 kmSanta Isabel Municipio 27 kmCayey Municipio 30 kmMaunabo Municipio 34 kmAibonito Municipio 34 kmCoamo Municipio 36 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
10:07 pm AST on 29 April 2018 ()
Where
13 km (8 mi) south of Jobos, PR · earthquakes near Jobos
Magnitude
M 2.5 (md)
Depth
13 km below the surface
Felt
no reports yet
Nearest
Guayama Municipio, 16 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3118 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 19 km (12 mi) from the epicentre. In Jobos, 13 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.

Likely felt in: Guayama 18 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 190 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 78,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 55,000× the energy of this one
  3. Around the size people start to feel M 3.0 4.9× the energy of this one
  4. This earthquake M 2.5 about 190 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 1,200 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 · 47 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 17.8348, -66.1665. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Guayama Municipio, PR 16 km (10 mi) N earthquakes near Guayama Municipio
Salinas Municipio, PR 18 km (11 mi) NNW earthquakes near Salinas Municipio
Arroyo Municipio, PR 20 km (13 mi) NE earthquakes near Arroyo Municipio
Patillas Municipio, PR 26 km (16 mi) NE earthquakes near Patillas Municipio
Santa Isabel Municipio, PR 27 km (17 mi) WNW earthquakes near Santa Isabel Municipio
Cayey Municipio, PR 30 km (19 mi) N earthquakes near Cayey Municipio

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

Aftershocks so far

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

  1. 1.9 11 km SSE of Jauca, Puerto Rico
  2. 1.8 5 km SE of Arroyo, Puerto Rico
  3. 2.0 6 km NE of Comerío, Puerto Rico
  4. 1.9 9 km S of Emajagua, Puerto Rico
  5. 2.0 4 km S of Arroyo, Puerto Rico
  6. 1.7 3 km ESE of G. L. Garcia, Puerto Rico
  7. 1.6 4 km SW of Capitanejo, Puerto Rico
  8. 2.2 4 km WSW of Capitanejo, Puerto Rico
  9. 2.5 3 km SW of Capitanejo, Puerto Rico
  10. 2.6 6 km NE of Comerío, Puerto Rico
  11. 2.0 1 km E of Parcelas Nuevas, Puerto Rico
  12. 1.7 1 km ESE of Guayabal, Puerto Rico
  13. 1.8 5 km NNW of Yaurel, Puerto Rico
  14. 1.8 5 km SSW of Salinas, Puerto Rico
  15. 2.6 3 km S of Palo Seco, 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.