QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9Md

Earthquake near Guaynabo, PR

No earthquake was likely felt in Guaynabo in the 24 hours to 11:28 am AST (15:28 UTC). The last one was M 4.1, 93 km (58 mi) ESE, at 5:44 am AST on 28 October 2026, estimated intensity II (weak) in town; 5 felt reports to USGS. Every earthquake near Guaynabo

This page: a magnitude 2.9 earthquake was recorded 7 km (4 mi) southwest of Guaynabo, PR, at 8:20 pm AST on 9 April 2017 (00:20 UTC), 63 km deep.

USGS: 6 km SW of Guaynabo, Puerto Rico

7 km (5 mi) S of Bayamón, PR

8:20 pm AST, Apr 9, 2017 · · 63 km deep · released about 680 lb of TNT

Every earthquake near Guaynabo Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Bayamón Municipio 4 kmGuaynabo Municipio 6 kmAguas Buenas Municipio 7 kmNaranjito Municipio 11 kmToa Alta Municipio 11 kmComerío Municipio 12 kmCataño Municipio 15 kmSan Juan Municipio 15 kmCidra Municipio 16 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
8:20 pm AST on 9 April 2017 ()
Where
7 km (4 mi) southwest of Guaynabo, PR · earthquakes near Guaynabo
Magnitude
M 2.9 (Md)
Depth
63 km below the surface
Felt
no reports yet
Nearest
Bayamón Municipio, 4 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3416 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 it was probably too small to be felt, even directly above it. In Guaynabo, 7 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: Aguas Buenas, Pájaros, Naranjito, Bayamón, Mucarabones, Sumidero.

How big was it?

This earthquake released about 680 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 22,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 16,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.4× the energy of this one
  4. This earthquake M 2.9 about 680 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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

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 · 6 km SSE of this epicentre
  2. 5.0 3 km N of Brenas, Puerto Rico · 28 km NW 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 18.3139, -66.1570. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Bayamón Municipio, PR 4 km (3 mi) NNW earthquakes near Bayamón Municipio
Guaynabo Municipio, PR 6 km (4 mi) NE earthquakes near Guaynabo Municipio
Aguas Buenas Municipio, PR 7 km (4 mi) SSE earthquakes near Aguas Buenas Municipio
Naranjito Municipio, PR 11 km (7 mi) WSW earthquakes near Naranjito Municipio
Toa Alta Municipio, PR 11 km (7 mi) WNW earthquakes near Toa Alta Municipio
Comerío Municipio, PR 12 km (7 mi) SSW earthquakes near Comerío Municipio

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

Aftershocks so far

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

  1. 1.8 0 km NNE of Ciales, Puerto Rico
  2. 2.6 7 km SE of Jobos, Puerto Rico
  3. 2.4 4 km W of Central Aguirre, Puerto Rico
  4. 2.6 6 km ENE of Tierras Nuevas Poniente, Puerto Rico
  5. 2.8 10 km NNE of Dorado, Puerto Rico
  6. 2.7 3 km SE of Pájaros, Puerto Rico
  7. 1.8 4 km SE of G. L. Garcia, Puerto Rico
  8. 2.7 10 km N of Brenas, Puerto Rico
  9. 2.5 17 km N of Loíza, Puerto Rico
  10. 2.1 1 km ESE of Playita, Puerto Rico
  11. 1.8 3 km NNW of Potala Pastillo, Puerto Rico
  12. 2.9 8 km ENE of San Juan, Puerto Rico
  13. 2.6 11 km NNW of Tierras Nuevas Poniente, Puerto Rico
  14. 3.1 1 km SE of Ceiba, Puerto Rico
  15. 2.4 3 km S 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.