QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

Earthquake near Aibonito, PR

No earthquake was likely felt in Aibonito in the 24 hours to 2:03 pm AST (18:03 UTC). The last one was M 3.3, 34 km (21 mi) SSW, at 8:40 am AST on 1 November 2026, estimated intensity II (weak) in town. Every earthquake near Aibonito

This page: a magnitude 1.9 earthquake was recorded 2 km (1 mi) northwest of Aibonito, PR, at 11:09 pm AST on 27 June 2017 (03:09 UTC), 9.0 km deep.

USGS: 2 km NW of Aibonito, Puerto Rico

36 km (22 mi) SW of San Juan, PR · 27 km (17 mi) WSW of Caguas, PR

11:09 pm AST, Jun 27, 2017 · · 9.0 km deep · released about 19 lb of TNT

Every earthquake near Aibonito Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Aibonito Municipio 3 kmBarranquitas Municipio 6 kmCoamo Municipio 10 kmComerío Municipio 10 kmCidra Municipio 13 kmCayey Municipio 15 kmNaranjito Municipio 15 kmCorozal Municipio 17 kmOrocovis Municipio 18 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
11:09 pm AST on 27 June 2017 ()
Where
2 km (1 mi) northwest of Aibonito, PR · earthquakes near Aibonito
Magnitude
M 1.9 (md)
Depth
9.0 km below the surface
Felt
no reports yet
Nearest
Aibonito Municipio, 3 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3422 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 11 km (7 mi) from the epicentre. In Aibonito, 2 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: Pastos, Barranquitas, Comerío, Parcelas La Milagrosa, Vázquez, Parcelas Nuevas.

How big was it?

This earthquake released about 19 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 790,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 560,000× the energy of this one
  3. Around the size people start to feel M 3.0 50× the energy of this one
  4. This earthquake M 1.9 about 19 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 12,000 times the energy of this one.

Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:

  1. 5.1 3 km W of Aguas Buenas, Puerto Rico · 19 km NE of this epicentre
  2. 5.0 3 km N of Brenas, Puerto Rico · 39 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 18.1533, -66.2791. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Aibonito Municipio, PR 3 km (2 mi) SSE earthquakes near Aibonito Municipio
Barranquitas Municipio, PR 6 km (4 mi) NNW earthquakes near Barranquitas Municipio
Coamo Municipio, PR 10 km (6 mi) WSW earthquakes near Coamo Municipio
Comerío Municipio, PR 10 km (6 mi) NE earthquakes near Comerío Municipio
Cidra Municipio, PR 13 km (8 mi) E earthquakes near Cidra Municipio
Cayey Municipio, PR 15 km (9 mi) ESE earthquakes near Cayey Municipio

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

Aftershocks so far

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

  1. 2.5 5 km ESE of G. L. Garcia, Puerto Rico
  2. 3.0 1 km SE of Corozal, Puerto Rico
  3. 1.8 22 km S of Jobos, Puerto Rico
  4. 2.4 20 km SSE of Jobos, Puerto Rico
  5. 2.4 3 km S of Salinas, Puerto Rico
  6. 2.2 4 km W of Central Aguirre, Puerto Rico
  7. 2.7 6 km SSW of Corozal, Puerto Rico
  8. 3.1 5 km NE of Orocovis, Puerto Rico
  9. 2.4 2 km W of Aibonito, Puerto Rico
  10. 3.0 6 km NW of Palomas, Puerto Rico
  11. 2.9 2 km NNE of Franquez, Puerto Rico
  12. 2.7 7 km NW of Sumidero, Puerto Rico
  13. 2.8 7 km N of Tierras Nuevas Poniente, Puerto Rico
  14. 2.4 4 km SE of Salinas, Puerto Rico
  15. 3.0 4 km SE of Salinas, 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.