QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

Earthquake near Punta Santiago, PR

No earthquake was likely felt in Punta Santiago in the 24 hours to 9:34 am AST (13:34 UTC). The last one was M 4.1, 49 km (31 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 Punta Santiago

This page: a magnitude 1.7 earthquake was recorded 18 km (11 mi) south-southeast of Punta Santiago, PR, at 9:27 pm AST on 10 July 2019 (01:27 UTC), 15 km deep.

USGS: 18 km SSE of Punta Santiago, Puerto Rico

60 km (37 mi) SE of San Juan, PR · 46 km (29 mi) ESE of Caguas, PR

9:27 pm AST, Jul 10, 2019 · · 15 km deep · released about 10 lb of TNT

Every earthquake near Punta Santiago Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Humacao Municipio 18 kmYabucoa Municipio 21 kmNaguabo Municipio 22 kmMaunabo Municipio 25 kmCeiba Municipio 26 kmVieques Municipio 27 kmLas Piedras Municipio 28 kmPatillas Municipio 34 kmJuncos Municipio 34 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
9:27 pm AST on 10 July 2019 ()
Where
18 km (11 mi) south-southeast of Punta Santiago, PR · earthquakes near Punta Santiago
Magnitude
M 1.7 (md)
Depth
15 km below the surface
Felt
no reports yet
Nearest
Humacao Municipio, 18 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2680 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 Punta Santiago, 18 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: Bajandas, El Negro, Candelero Arriba, Comunas, Esperanza, Humacao.

How big was it?

This earthquake released about 10 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 92× the energy of this one
  4. This earthquake M 1.7 about 10 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 23,000 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 18.0221, -65.6653. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Humacao Municipio, PR 18 km (11 mi) NW earthquakes near Humacao Municipio
Yabucoa Municipio, PR 21 km (13 mi) WNW earthquakes near Yabucoa Municipio
Naguabo Municipio, PR 22 km (14 mi) NNW earthquakes near Naguabo Municipio
Maunabo Municipio, PR 25 km (15 mi) W earthquakes near Maunabo Municipio
Ceiba Municipio, PR 26 km (16 mi) N earthquakes near Ceiba Municipio
Vieques Municipio, PR 27 km (17 mi) ENE earthquakes near Vieques Municipio

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

Aftershocks so far

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

  1. 3.0 10 km S of Esperanza, Puerto Rico
  2. 3.9 6 km SW of Esperanza, Puerto Rico
  3. 2.8 29 km SSE of Esperanza, Puerto Rico
  4. 1.6 6 km SSW of Jagual, Puerto Rico
  5. 1.8 18 km SW of Esperanza, Puerto Rico
  6. 2.2 4 km ESE of Bayamon, Puerto Rico
  7. 1.9 25 km SW of Esperanza, Puerto Rico
  8. 1.6 14 km WSW of Esperanza, Puerto Rico
  9. 1.8 28 km SE of Emajagua, Puerto Rico
  10. 1.8 27 km SE of Emajagua, Puerto Rico
  11. 1.6 2 km NNW of Jagual, Puerto Rico
  12. 1.8 28 km SW of Esperanza, Puerto Rico
  13. 1.9 26 km ESE of El Negro, Puerto Rico
  14. 1.7 25 km SE of Emajagua, Puerto Rico
  15. 2.8 24 km SW of Esperanza, 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.