QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

Earthquake near Añasco, PR

No earthquake was likely felt in Añasco in the 24 hours to 12:58 pm AST (16:58 UTC). The last one was M 3.0, 36 km (22 mi) SSE, at 5:47 pm AST on 7 November 2026, estimated intensity II (weak) in town. Every earthquake near Añasco

This page: a magnitude 1.8 earthquake was recorded 4 km (3 mi) south-southwest of Añasco, PR, at 5:40 pm AST on 9 July 2019 (21:40 UTC), 67 km deep.

USGS: 4 km SSW of Añasco, Puerto Rico

6 km (4 mi) NNW of Mayagüez, PR · 117 km (73 mi) W of San Juan, PR

5:40 pm AST, Jul 9, 2019 · · 67 km deep · released about 15 lb of TNT

Every earthquake near Añasco Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Añasco Municipio 5 kmHormigueros Municipio 14 kmRincón Municipio 14 kmAguada Municipio 14 kmMoca Municipio 17 kmLas Marías Municipio 20 kmSan Germán Municipio 21 kmSan Sebastián Municipio 22 kmMaricao Municipio 25 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
5:40 pm AST on 9 July 2019 ()
Where
4 km (3 mi) south-southwest of Añasco, PR · earthquakes near Añasco
Magnitude
M 1.8 (md)
Depth
67 km below the surface
Felt
no reports yet
Nearest
Añasco Municipio, 5 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2682 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 Añasco, 4 km away, the estimate is intensity I (not felt). 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: La Playa, Las Marias, Espino, Mayagüez, Stella, Hormigueros.

How big was it?

This earthquake released about 15 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 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 730,000× the energy of this one
  3. Around the size people start to feel M 3.0 65× the energy of this one
  4. This earthquake M 1.8 about 15 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 4.3 on 2017-10-14 — about 5,800 times the energy of this one.

Before 2016, the USGS record lists 7 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.4 32 km NW of Aguadilla, Puerto Rico · 47 km NNW of this epicentre
  2. 6.3 6 km WNW of Aguadilla, Puerto Rico · 22 km NNW of this epicentre
  3. 6.1 15 km WNW of San Antonio, Puerto Rico · 34 km NNW of this epicentre
  4. 6.1 18 km NNW of San Antonio, Puerto Rico · 43 km N of this epicentre
  5. 5.8 4 km E of Moca, Puerto Rico · 19 km NNE 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 18.2490, -67.1625. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Añasco Municipio, PR 5 km (3 mi) NE earthquakes near Añasco Municipio
Hormigueros Municipio, PR 14 km (8 mi) SSE earthquakes near Hormigueros Municipio
Rincón Municipio, PR 14 km (8 mi) NW earthquakes near Rincón Municipio
Aguada Municipio, PR 14 km (9 mi) N earthquakes near Aguada Municipio
Moca Municipio, PR 17 km (10 mi) NNE earthquakes near Moca Municipio
Las Marías Municipio, PR 20 km (12 mi) E earthquakes near Las Marías Municipio

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

Aftershocks so far

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

  1. 1.8 3 km E of La Parguera, Puerto Rico
  2. 2.0 2 km SSW of Adjuntas, Puerto Rico
  3. 1.9 3 km NE of San Germán, Puerto Rico
  4. 2.1 10 km W of Mayagüez, Puerto Rico
  5. 1.6 1 km SSW of Pole Ojea, Puerto Rico
  6. 2.1 4 km SW of Añasco, Puerto Rico
  7. 2.0 1 km WSW of Pole Ojea, Puerto Rico
  8. 2.0 7 km W of Mayagüez, Puerto Rico
  9. 1.6 11 km S of Pole Ojea, Puerto Rico
  10. 2.0 9 km SSW of Pole Ojea, Puerto Rico
  11. 2.0 9 km S of Pole Ojea, Puerto Rico
  12. 2.4 9 km N of Quebradillas, Puerto Rico
  13. 2.3 5 km ENE of La Parguera, Puerto Rico
  14. 1.8 12 km NW of Puerto Real, Puerto Rico
  15. 1.7 1 km NE of Liborio Negron Torres, 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.