QuakeIndex

Earthquakes in San Sebastián Municipio, Puerto Rico

← Earthquakes in Puerto Rico

The most recent earthquake of M2.5 or more near San Sebastián Municipio was M 2.8, 9 km NNW of Garrochales, Puerto Rico, 46 km (29 mi) ENE of the centre of San Sebastián Municipio, at 6:12 am AST on 11 November 2026, 87 km deep. At that size and distance it was probably too weak to feel at the centre of San Sebastián Municipio. 2 smaller earthquakes have been recorded near San Sebastián Municipio since.

In the last 24 hours, 2 earthquakes of M1.5 or more were recorded within 50 km (31 mi) of the centre of San Sebastián Municipio; the largest was M 2.4, 4 km SSW of Guánica, Puerto Rico, 44 km (27 mi) S of the centre of San Sebastián Municipio, at 3:43 pm AST.

Last 24 hours
2
Last 7 days
17
Last 30 days
69 · an average 30 days here since 2016: 197
Last 12 months
1,293 · largest M 4.8 on 18 September 2026
Since 2016
26,076 earthquakes of M1.5 or more
Largest since 2016
M 6.4 on 7 January 2020, 4 km SSE of Indios, Puerto Rico

Latest quake, 24 hours and 7 days: the QuakeIndex database, which reads USGS every 30 seconds, read at ; 30 days and 12 months: the QuakeIndex catalogue, counted to · earthquakes of M1.5 or more within 50 km (31 mi) of the centre of San Sebastián Municipio · shaking is estimated for the centre with the intensity equation USGS Did You Feel It? uses

57

Typical QuakeIndex 57 / 100

17 quakes of M1.5 or larger in the last 7 days within 50 km. Normal for here is 16 to 48 in a week.

Compared against San Sebastián Municipio, Puerto Rico's own 10 years · USGS catalogue · updated

If you felt one

QuakeIndex does not issue warnings or forecasts. For earthquake early warning see ShakeAlert and the MyShake app.

The last 30 days

Oct 14 Oct 29 Nov 12
Each mark is a day's largest quake within range; its size is the magnitude. The shaded band is the magnitude a day's largest quake normally falls in here (M2.4–M3.0), from this place's own 10-year record. A mark above the band is a bigger day than usual.

Show these earthquakes on your own site: a free card with this strip and the latest quakes near San Sebastián Municipio, Puerto Rico, for a local news site, school or neighborhood page.

Live · last 7 days

Latest earthquakes within 50 km

None within 50 km in the latest snapshot we hold; the full 7 days load from USGS as this page opens.

Source USGS · snapshot of

The last 7 days on the map

The map loads when it scrolls into view.
Every earthquake within 50 km of San Sebastián Municipio, Puerto Rico in the last 7 days, from the USGS feed. Colour and size are magnitude; tap one for its page.

Open the full map — zoom anywhere, or find your own location →

The centre is 18.331, -66.969, the Census internal point of San Sebastián Municipio, Puerto Rico from the US Census Bureau Gazetteer (2024). Activity on this page is measured within 50 km of it — the dashed circle.

Largest on record nearby

The strongest shaking this record implies at the centre of San Sebastián Municipio, Puerto Rico is intensity V (moderate), from the M 6.4 of 2020, 45 km away. At that level nearly everyone notices; some objects fall and plaster can crack.

MagnitudeWhenWhereShaking here (est.)
M 6.4 4 km SSE of Indios, Puerto Rico · felt by 1,615 V · Moderate
M 5.9 5 km SE of Maria Antonia, Puerto Rico · felt by 974 V · Moderate
M 5.6 0 km NW of Magas Arriba, Puerto Rico · felt by 149 IV · Light
M 5.3 9 km SSE of La Parguera, Puerto Rico · felt by 346 IV · Light
M 5.2 Puerto Rico region · felt by 459 IV · Light
M 5.2 4 km S of Maria Antonia, Puerto Rico · felt by 555 IV · Light
M 5.0 1 km N of Indios, Puerto Rico · felt by 811 IV · Light
M 4.9 5 km SE of La Parguera, Puerto Rico · felt by 142 III · Weak

From the QuakeIndex catalogue, built from the USGS FDSN event service · within 50 km of the centre above. Shaking is an estimate for the centre from magnitude, depth and distance, with the intensity equation USGS Did You Feel It? uses (Atkinson & Wald, 2007), on the Modified Mercalli scale. Ground conditions change it locally; it is a description of the past, not a hazard rating.

Before 2016

The USGS record from 1900 to 2015 lists 8 earthquakes of M5 or more within 50 km of the centre of San Sebastián Municipio, Puerto Rico:

  1. 7.1 24 km NNW of San Antonio, Puerto Rico · 47 km NNW of the centre
  2. 6.3 6 km WNW of Aguadilla, Puerto Rico · 29 km WNW of the centre
  3. 6.1 15 km WNW of San Antonio, Puerto Rico · 37 km NW of the centre
  4. 6.1 18 km NNW of San Antonio, Puerto Rico · 41 km NNW of the centre
  5. 5.8 12 km N of Garrochales, Puerto Rico · 50 km ENE of the centre
  6. 5.8 4 km E of Moca, Puerto Rico · 13 km NW of the centre
  7. 5.2 19 km SW of Stella, Puerto Rico · 45 km WSW of the centre
  8. 5.1 21 km SW of Stella, Puerto Rico · 46 km WSW of the centre

USGS ComCat, M5+ from 1900 to 2015. Epicentres of early earthquakes are estimates. This is the record, not a forecast.

Town pages near San Sebastián Municipio, Puerto Rico

San Sebastián 2 km · 6 M2.5+ named after it · Lares 11 km · 11 M2.5+ named after it · Quebradillas 16 km · 27 M2.5+ named after it · Rafael Hernandez 19 km · 4 M2.5+ named after it · Isabela 20 km · 207 M2.5+ named after it · Aguadilla 22 km · 475 M2.5+ named after it · Mayagüez 23 km · 188 M2.5+ named after it · Hatillo 23 km · 57 M2.5+ named after it · Aguada 24 km · 20 M2.5+ named after it · San Germán 29 km · 21 M2.5+ named after it · Rincón 30 km · 206 M2.5+ named after it · Arecibo 31 km · 255 M2.5+ named after it

Each town page lists every M1.5+ earthquake within 30 km since 2016 and the ones USGS named after it. Town names: GeoNames (CC BY 4.0).

Be ready

Earthquakes cannot be predicted, here or anywhere, so the useful step is the one taken beforehand. The advice below is from the agencies responsible for it.