QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

Earthquake near Tallaboa, PR

No earthquake was likely felt in Tallaboa in the 24 hours to 12:53 pm AST (16:53 UTC). The last one was M 2.1, 9 km (5 mi) WNW, at 4:39 pm AST on 9 November 2026, estimated intensity II (weak) in town. Every earthquake near Tallaboa

This page: a magnitude 2.1 earthquake was recorded 16 km (10 mi) south-southeast of Tallaboa, PR, at 10:58 pm AST on 21 May 2018 (02:58 UTC), 19 km deep.

USGS: 15 km SSE of Tallaboa, Puerto Rico

16 km (10 mi) SSW of Ponce, PR

10:58 pm AST, May 21, 2018 · · 19 km deep · released about 43 lb of TNT

Every earthquake near Tallaboa Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Ponce Municipio 17 kmPeñuelas Municipio 20 kmGuayanilla Municipio 22 kmJuana Díaz Municipio 24 kmGuánica Municipio 29 kmSanta Isabel Municipio 31 kmYauco Municipio 33 kmVillalba Municipio 36 kmAdjuntas Municipio 37 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
10:58 pm AST on 21 May 2018 ()
Where
16 km (10 mi) south-southeast of Tallaboa, PR · earthquakes near Tallaboa
Magnitude
M 2.1 (md)
Depth
19 km below the surface
Felt
no reports yet
Nearest
Ponce Municipio, 17 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3095 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 Tallaboa, 16 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: Ponce, Magas Arriba, Tallaboa Alta, Capitanejo, Indios, Guayanilla.

How big was it?

This earthquake released about 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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 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 17.8611, -66.6611. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Ponce Municipio, PR 17 km (10 mi) NNE earthquakes near Ponce Municipio
Peñuelas Municipio, PR 20 km (12 mi) NNW earthquakes near Peñuelas Municipio
Guayanilla Municipio, PR 22 km (13 mi) NW earthquakes near Guayanilla Municipio
Juana Díaz Municipio, PR 24 km (15 mi) NE earthquakes near Juana Díaz Municipio
Guánica Municipio, PR 29 km (18 mi) WNW earthquakes near Guánica Municipio
Santa Isabel Municipio, PR 31 km (19 mi) ENE earthquakes near Santa Isabel 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. 2.7 16 km S of Indios, Puerto Rico
  2. 2.8 19 km SSE of Maria Antonia, Puerto Rico
  3. 2.5 18 km SSE of Maria Antonia, Puerto Rico
  4. 2.0 4 km ENE of La Parguera, Puerto Rico
  5. 2.0 4 km ESE of Maria Antonia, Puerto Rico
  6. 2.0 22 km S of Guánica, Puerto Rico
  7. 2.4 14 km S of Tallaboa, Puerto Rico
  8. 1.6 1 km SW of Adjuntas, Puerto Rico
  9. 1.9 0 km SE of Adjuntas, Puerto Rico
  10. 1.9 1 km NE of Adjuntas, Puerto Rico
  11. 1.8 1 km SSW of Adjuntas, Puerto Rico
  12. 2.5 2 km S of Adjuntas, Puerto Rico
  13. 2.4 1 km SSW of Adjuntas, Puerto Rico
  14. 2.6 2 km SSW of Adjuntas, Puerto Rico
  15. 2.1 1 km SSE of Lluveras, 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.