Earthquake.now

M5.1 Earthquake near San Juan, Peru — 22 September 2025

A moderate earthquake of magnitude 5.1 was recorded near San Juan, Peru on , with an epicentre 33 km south-southeast of San Juan, at a focal depth of 32.0 km. It was the strongest of the 13 earthquakes recorded in Peru in the preceding 30 days.

5.1 Moderate

Time (UTC): 2025-09-22 18:46:41

Time (your timezone): —

Magnitude: 5.1 (moderate)

Focal depth: 32.0 km (shallow)

Epicentre: -15.6449, -75.0318

Location: 33 km SSE of San Juan, Peru

Country: Peru

USGS link to NOAA tsunami information: Not linked

Review status: Reviewed

Source: USGS event page

How strong was this earthquake?

Moderate earthquakes can damage poorly built or unreinforced structures near the epicentre, while well-engineered buildings typically escape serious harm. Shaking is often strong enough to wake sleeping residents over a wide area.

A magnitude 5.1 earthquake radiates roughly 674 tons of TNT equivalent in seismic energy.

The USGS assigns this earthquake a significance score of 400, which is below the USGS threshold of more than 600 for its significant-earthquake list. The ranking combines magnitude with available Did You Feel It responses and PAGER alert level; it is not a direct measurement of damage.

What the magnitude scale actually measures →

When it happened locally

That is about 13:46 local solar time at the epicentre, around midday.

This event was shallower than 74% of the 277 earthquakes recorded in Peru in our catalogue and stronger than 91% of them.

Where was the epicentre?

The epicentre was located at -15.6449, -75.0318 — 33 km south-southeast of San Juan. The closest other recorded event was a magnitude 4.9 earthquake 16 km south-southeast of here on 31 January 2026.

The nearest other settlements in our records are Marcona (46 km north), Acarí (81 km northeast), Tocota (88 km east) and Atiquipa (96 km southeast).

Why the 32 km depth matters

At 32 km this was a shallow earthquake. Shallow events release their energy close to the surface, so for a given magnitude they produce noticeably stronger shaking — and more damage — than deeper ones. Roughly three quarters of all earthquakes worldwide occur at shallow depths.

This catalogue does not ingest eyewitness responses, so it cannot confirm where this earthquake was felt. Based on magnitude alone, an event this size can be felt widely and may cause minor local damage. Its shallow focus makes stronger surface shaking more likely than for a deeper event of the same magnitude.

Read more on how focal depth changes what you feel →

What does the tsunami information flag mean?

The USGS record does not carry a link to NOAA tsunami information. That field is not an all-clear and does not state whether a tsunami occurred. In this case, a damaging tsunami would be less likely because at M5.1 it falls below the magnitude 6.5 threshold that generally applies before a submarine earthquake displaces enough water to generate a damaging tsunami; it occurred inland rather than beneath the sea floor. For an active coastal alert, use tsunami.gov or your local warning authority.

How earthquakes generate tsunamis, and what the alert levels mean →

Aftershocks and local seismic history

2 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 5.5.

59 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 6.7 event near Aniso on 20 August 2026. This M5.1 event released about 251 times less energy than that event.

13 earthquakes have been recorded within 100 km of this epicentre in the past year, 2 of them in the past 30 days.

How long aftershock sequences last, and how large they get →

Where this event sits in the record

This earthquake is part of the September 2025 worldwide record, and of earthquakes in Peru during September 2025. Browse the full monthly archive to compare periods.

Nearest recorded earthquakes to this epicentre

Other recent earthquakes in Peru

All recorded earthquakes in Peru →

Other magnitude 5 earthquakes worldwide

All magnitude 5 earthquakes →

Questions about this earthquake

How strong was the earthquake near San Juan?

It measured magnitude 5.1 — a moderate earthquake. A magnitude 5.1 earthquake radiates roughly 674 tons of TNT equivalent in seismic energy.

How deep was the earthquake near San Juan?

The focus was 32 km below the surface, which counts as shallow.

Was the San Juan earthquake felt at the surface?

At magnitude 5.1 and a focal depth of 32 km, shaking would have been concentrated near the epicentre.

When did the earthquake near San Juan happen?

22 September 2025 at 18:46 UTC.

Was there a tsunami?

No. The USGS record carries no tsunami-information link for this event.

Have there been aftershocks?

2 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 5.5.

How often do earthquakes happen near San Juan?

59 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 6.7 event near Aniso on 20 August 2026. This M5.1 event released about 251 times less energy than that event.