USGS · August 9, 2026

Magnitude 3.5 earthquake — 70 km NW of San Antonio, Puerto Rico

A magnitude 3.5 earthquake was recorded near 70 km NW of San Antonio, Puerto Rico on Aug 9, 2026, 12:50 PM (local time at the epicentre — AST, UTC-4), at a depth of about 8.0 km, according to USGS.

USGSShallow (0–70 km)Reviewed by a seismologist

Updated 2026-09-04 18:47 UTC

The full record

Magnitude: M 3.5 · duration magnitude
Location: 70 km NW of San Antonio, Puerto Rico
Local time at the epicentre: Aug 9, 2026, 12:50 PM — AST, UTC-4
Time (UTC): 2026-08-09 16:50 UTC
Depth: 8.0 km · Shallow (0–70 km)
Coordinates: 18.951, -67.563
Felt reports: No “Did You Feel It?” reports submitted
Tsunami: No tsunami evaluation was flagged for this earthquake.
Significance: 183 / 1000 · routine event
Solution quality: 19 seismic stations used · 225° azimuthal gap (less well-constrained epicentre)
Review status: Reviewed by a seismologist
Catalog: USGS

Open the official catalog record

Epicentre and nearby recent earthquakes

The highlighted circle is this earthquake. Smaller circles are other events recorded nearby in the last 30 days.

What the shaking was like

Shallow earthquakes release their energy close to the surface, so they are felt more strongly nearby than a deeper earthquake of the same magnitude.

No intensity estimate was published for this event, which is usual for small earthquakes far from populated areas.

Felt it yourself? USGS collects first-hand reports through “Did You Feel It?”, and those reports are what produce the community intensity above.

Who lives nearby

About 0 people live in towns within 30 km of the epicentre, and 278,406 within 100 km. Distances are from the epicentre to the town centre.

Place	Distance	Population
San Antonio	70.6 km SE	2,300
Caban	72.1 km SE	3,959
Aguadilla	72.3 km SE	16,073
Rafael Hernandez	73.7 km SE	1,516
Aguada	74.8 km SSE	4,040
Rincón	75.4 km SSE	1,499
Isabela	75.6 km SE	12,505
Aceitunas	77.0 km SE	1,688
Stella	77.4 km SSE	1,293
Mora	77.8 km SE	1,857

Earthquake history in this area

No earthquake of magnitude 4.5+ has been recorded within 200 km of this epicentre since 1960, in Puerto Rico.

Other earthquakes near this epicentre

37 other events within 100 km in the last 30 days.

Be first to know about the next earthquake near 70 km NW of San Antonio, Puerto Rico

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Frequently asked questions

How strong was the 70 km NW of San Antonio, Puerto Rico earthquake?

Magnitude 3.5 (duration magnitude), at a depth of 8.0 km. Shallow earthquakes release their energy close to the surface, so they are felt more strongly nearby than a deeper earthquake of the same magnitude.

Exactly when did it happen?

Aug 9, 2026, 12:50 PM (local time at the epicentre — AST, UTC-4). In universal time: 2026-08-09 16:50 UTC.

Was it felt?

No “Did You Feel It?” reports were submitted for this event. Small earthquakes usually pass unnoticed except very close to the epicentre.

Was there a tsunami warning?

No tsunami evaluation was flagged for this earthquake.

Which towns are closest to the epicentre?

The closest is San Antonio, 70.6 km SE (population 2,300).

Are earthquakes normal in this area?

37 further events were recorded within 100 km of the epicentre in the last 30 days.

How do I get alerts for the next earthquake here?

Install the free SeismoWatch Android app, draw a box over this area, set a minimum magnitude, and turn alerts on.

About this page

Event data: U.S. Geological Survey (USGS), the European-Mediterranean Seismological Centre (EMSC) and, in Venezuela, FUNVISIS. Populated places and time zones: GeoNames (CC BY 4.0). Preliminary solutions are revised as more observations arrive.