QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

Earthquake near Jobos, PR

No earthquake was likely felt in Jobos in the 24 hours to 4:27 pm AST (20:27 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 1.8 earthquake was recorded 23 km (14 mi) south of Jobos, PR, at 7:07 pm AST on 30 August 2017 (23:07 UTC), 21 km deep.

USGS: 22 km S of Jobos, Puerto Rico

73 km (45 mi) S of San Juan, PR · 54 km (34 mi) S of Caguas, PR

7:07 pm AST, Aug 30, 2017 · · 21 km deep · released about 14 lb of TNT

Every earthquake near Jobos Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Guayama Municipio 25 kmArroyo Municipio 26 kmSalinas Municipio 28 kmPatillas Municipio 32 kmSanta Isabel Municipio 35 kmMaunabo Municipio 37 kmCayey Municipio 39 kmAibonito Municipio 44 kmYabucoa Municipio 45 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
7:07 pm AST on 30 August 2017 ()
Where
23 km (14 mi) south of Jobos, PR · earthquakes near Jobos
Magnitude
M 1.8 (md)
Depth
21 km below the surface
Felt
no reports yet
Nearest
Guayama Municipio, 25 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3360 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 Jobos, 23 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, Arroyo, Guayama, Coquí, Corazón, Olimpo.

How big was it?

This earthquake released about 14 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× the energy of this one
  4. This earthquake M 1.8 about 14 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 18,000 times the energy of this one.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

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 17.7511, -66.1353. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Guayama Municipio, PR 25 km (15 mi) N earthquakes near Guayama Municipio
Arroyo Municipio, PR 26 km (16 mi) NNE earthquakes near Arroyo Municipio
Salinas Municipio, PR 28 km (17 mi) NNW earthquakes near Salinas Municipio
Patillas Municipio, PR 32 km (20 mi) NNE earthquakes near Patillas Municipio
Santa Isabel Municipio, PR 35 km (22 mi) NW earthquakes near Santa Isabel Municipio
Maunabo Municipio, PR 37 km (23 mi) NE earthquakes near Maunabo Municipio

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

Aftershocks so far

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

  1. 2.0 9 km SSW of Central Aguirre, Puerto Rico
  2. 2.2 9 km SSE of Jobos, Puerto Rico
  3. 2.2 23 km S of Ponce, Puerto Rico
  4. 2.4 14 km SSE of Central Aguirre, Puerto Rico
  5. 2.7 1 km NE of Jauca, Puerto Rico
  6. 2.7 1 km S of G. L. Garcia, Puerto Rico
  7. 2.7 10 km S of Jobos, Puerto Rico
  8. 1.5 3 km SSW of Arroyo, Puerto Rico
  9. 2.4 5 km N of Yaurel, Puerto Rico
  10. 3.0 4 km SE of G. L. Garcia, Puerto Rico
  11. 1.5 10 km S of Jobos, Puerto Rico
  12. 3.1 4 km SSE of Palo Seco, Puerto Rico
  13. 2.8 18 km SSE of Arroyo, Puerto Rico
  14. 1.6 20 km S of Arroyo, Puerto Rico
  15. 2.1 3 km SW of Potala Pastillo, 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.