QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

Earthquake near Jobos, PR

No earthquake was likely felt in Jobos in the 24 hours to 4:31 pm AST (20:31 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 1.6 earthquake was recorded in Jobos, PR, at 10:22 pm AST on 27 June 2018 (02:22 UTC), 18 km deep.

USGS: 0 km W of Jobos, Puerto Rico

51 km (32 mi) SSW of San Juan, PR · 34 km (21 mi) SSW of Caguas, PR

10:22 pm AST, Jun 27, 2018 · · 18 km deep · released about 7.6 lb of TNT

Every earthquake near Jobos Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Guayama Municipio 4 kmSalinas Municipio 10 kmArroyo Municipio 14 kmCayey Municipio 17 kmPatillas Municipio 20 kmAibonito Municipio 22 kmSanta Isabel Municipio 23 kmCidra Municipio 24 kmCoamo Municipio 26 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
10:22 pm AST on 27 June 2018 ()
Where
in Jobos, PR · earthquakes near Jobos
Magnitude
M 1.6 (md)
Depth
18 km below the surface
Felt
no reports yet
Nearest
Guayama Municipio, 4 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3059 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. 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, Olimpo, Corazón, La Plena.

How big was it?

This earthquake released about 7.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
  3. Around the size people start to feel M 3.0 130× the energy of this one
  4. This earthquake M 1.6 about 7.6 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 32,000 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 · 34 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 17.9551, -66.1731. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Guayama Municipio, PR 4 km (3 mi) ENE earthquakes near Guayama Municipio
Salinas Municipio, PR 10 km (6 mi) W earthquakes near Salinas Municipio
Arroyo Municipio, PR 14 km (9 mi) E earthquakes near Arroyo Municipio
Cayey Municipio, PR 17 km (10 mi) N earthquakes near Cayey Municipio
Patillas Municipio, PR 20 km (13 mi) ENE earthquakes near Patillas Municipio
Aibonito Municipio, PR 22 km (14 mi) NNW earthquakes near Aibonito Municipio

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

Aftershocks so far

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

  1. 2.1 3 km ESE of Cayey, Puerto Rico
  2. 2.4 2 km SSE of Cidra, Puerto Rico
  3. 2.5 17 km SSE of Jobos, Puerto Rico
  4. 2.5 3 km WSW of Sumidero, Puerto Rico
  5. 2.1 11 km SSW of Potala Pastillo, Puerto Rico
  6. 1.9 6 km N of Ponce, Puerto Rico
  7. 1.5 3 km W of Palo Seco, Puerto Rico
  8. 1.6 9 km S of Emajagua, Puerto Rico
  9. 2.1 8 km S of Emajagua, Puerto Rico
  10. 2.2 2 km ESE of Parcelas Nuevas, Puerto Rico
  11. 1.9 5 km SW of Playita Cortada, Puerto Rico
  12. 2.8 1 km NW of Naranjito, Puerto Rico
  13. 1.7 8 km S of Villalba, Puerto Rico
  14. 3.0 4 km ESE of Bayamon, Puerto Rico
  15. 2.6 3 km SSE of Guaynabo, 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.