Côtes-d'Armor, France – Earthquakes

This page summarizes earthquakes in Côtes-d'Armor (France). The most recently recorded event was a magnitude M1.7 earthquake near Trévron on 2026-09-18 10:05:29 UTC. All event lists and map markers are limited to the last 30 days.

Seismic profile ↓
Earthquakes (last 30 days)
9
Max magnitude (last 30 days)
M2.2
Avg magnitude (last 30 days)
M1.89
Avg depth (last 30 days)
2 km

Seismic profile

Analysis period18 Sep 2025 – 18 Sep 2026Data as of: 18 Sep 2026 · 14:00 UTC
Minimum magnitude

What the data show

Côtes-d'Armor · M ≥ 2.0

After source reconciliation, the catalogue contains 20 event entries of M2.0 or above for this area and period, spread over 20 days.

Catalogue entries2018 Sep 2025 – 18 Sep 2026
Strongest recorded earthquakeM2.6Bréhand ↗
Depth · median5.0 km20 events with valid depth
Last 30 days3Previous 30 days: 1

These figures describe the stored catalogue. Recording, magnitude types and geographic attribution may vary by source and period; completeness has not been established.

18 Sep 2025 – 18 Sep 2026

Earthquakes by month

M ≥ 2.0

Each bar counts events within the selected period. Hatched months are only partially included.

View data table
MonthAnalysis periodCatalogue entries
September 2025 · Partial month18 Sep 2025 – 30 Sep 20250
October 202501 Oct 2025 – 31 Oct 20250
November 202501 Nov 2025 – 30 Nov 20250
December 202501 Dec 2025 – 31 Dec 20250
January 202601 Jan 2026 – 31 Jan 20265
February 202601 Feb 2026 – 28 Feb 20263
March 202601 Mar 2026 – 31 Mar 20262
April 202601 Apr 2026 – 30 Apr 20260
May 202601 May 2026 – 31 May 20260
June 202601 Jun 2026 – 30 Jun 20263
July 202601 Jul 2026 – 31 Jul 20264
August 202601 Aug 2026 – 31 Aug 20260
September 2026 · Partial month01 Sep 2026 – 18 Sep 20263

How strong were the earthquakes?

Catalogue entries · 20

M 2.0 – < 3.020
M 3.0 – < 4.00
M 4.0 – < 5.00
M 5.0 – < 6.00
M ≥ 6.00

At what depth did they occur?

20 events with valid depth

0 – < 30 km20
30 – < 70 km0
70 – < 300 km0
300 – 750 km0

0 events without valid depth are excluded here.

Depth · median

Half of the available values lie on either side of the median; ties are possible.

Current period in context

Last 30 days3
Previous 30 days1
Median of the eleven previous 30-day periods1

Same magnitude threshold, separate periods. Differences may also reflect changes in recording. No hazard level or forecast is inferred.

Where were earthquakes recorded?

Events assigned to Côtes-d'Armor in the stored location data are analysed. This is not a radius search. Missing or different attributions are excluded.

The interactive map complements the event links on this page.

Marker size and colour indicate magnitude.

Strongest recorded earthquake

18 Sep 2025 – 18 Sep 2026 · M ≥ 2.0

Data and methodology

Analysis period: 18 Sep 2025 14:00 – 18 Sep 2026 14:00 UTC

Data and methodology

Reports are first reconciled using existing event associations. Additional reports from different sources are consolidated only when every pair is within 5 seconds, 10 km and 0.5 magnitude units, source groups do not overlap and exactly one group matches. Ambiguous cases remain separate. The preferred report determines magnitude, time and area; period and magnitude filters are applied afterwards. The start is included and the end excluded (UTC).

1 additional source reports were consolidated during source reconciliation.

Events assigned to Côtes-d'Armor in the stored location data are analysed. This is not a radius search. Missing or different attributions are excluded.

These figures describe the stored catalogue. Recording, magnitude types and geographic attribution may vary by source and period; completeness has not been established.

Source reports used

The preferred report of each group is counted. Source priority follows the earthquake list. Different magnitude types and recording gaps limit comparability.

  • EMSC12
  • RESIF8

The profile is recalculated hourly from the earthquake catalogue. Later source revisions may also change historical values.

Data as of: 18 Sep 2026 · 14:32 UTC

Map (last 30 days)

< 2 2–4 4–5 ≥ 5

About Côtes-d'Armor

The Côtes-d'Armor, formerly known as Côtes-du-Nord until 1990, is a department in the north of Brittany, in northwestern France. In 2023, it had a population of 611,859.

Seismic activity in 2026

In 2026, Côtes-d'Armor recorded 65 earthquakes within France. The average magnitude was M1.90. The strongest event reached M2.6.

By event count in 2026, this region ranks #15 within France.

Located on the Eurasia Plate.

Earthquakes in Côtes-d'Armor (last 30 days)

M1.7
Trévron
2026-09-18 · 10:05 UTC · 0 km
›
M2.2
Corseul
2026-09-16 · 10:20 UTC · 5 km
›
M1.6
Tréfumel
2026-09-16 · 09:02 UTC · 0 km
›
M1.6
Languédias
2026-09-14 · 11:10 UTC · 0 km
›
M2.1
Hénanbihen
2026-09-10 · 10:16 UTC · 0 km
›
M1.8
Corseul
2026-09-09 · 09:19 UTC · 0 km
›
M1.5
Saint-Fiacre
2026-09-04 · 10:03 UTC · 0 km
›
M2.1
Bréhand
2026-09-02 · 07:51 UTC · 5 km
›
M1.7
Plémet
2026-08-24 · 08:41 UTC · 0 km
›