Fagradalsfjall
Seismicity by period · derived statistics from Skjálftalísa (Icelandic Met Office)
Status (automatic)
No particular signs of unrest in the last 24 hours — 1 earthquake recorded, within the system's normal range.VONA = Volcano Observatory Notice for Aviation; the official Met Office colour code for aviation. Independent of Skjálfti's automatic analysis.
🕰️ Last eruption / event — 3 years ago
Litli-Hrútur (3rd Fagradalsfjall eruption) (2023-07-10). Activity shifted NW from Fagradalsfjall to the Sundhnúkur fissure system in Oct 2023.
Volcanic system in the central Reykjanes Peninsula. Erupted in 2021, 2022 and 2023 (Geldingadalir, Meradalir, Litli-Hrútur) — the first eruptions on the peninsula in ~800 years. (overview — more at vedur.is) · circle on the map = rough outline of the system (radius).
📜 Did you know?
Fagradalsfjall itself had been dormant for about 6000 years before the 2021 eruption. The Reykjanes Peninsula as a whole had been quiet for ~800 years (since the Reykjaneseldar of 1210-1240); models suggest a new 200-300 year active cycle.
Historical eruptions in the system — points colored by size, blue circle shows where we are now in time.
☁ Air quality — SO₂
Real-time SO₂ from Environment Agency (2026-06-10T08:00 UTC). Yellow > 20 µg/m³, orange > 125 (health threshold), red > 350. Nearest stations to this system; past 24h shown for the highest.
Grindavík7.4 µg/m³
Ásbrú (Keflavík)7.1 µg/m³
Hafnarfjörður (Hvaleyrarholt)5.3 µg/m³
Keflavík (Vatnaveröld)4.7 µg/m³
Vogar3.6 µg/m³
Points = earthquake locations in the selected window, coloured by magnitude: ● M3+ · ● M2+ · ● smaller (a sample if more than 800).
Earthquakes
1
Largest
M-0.1
M3,0+
0
Depth range
0–0 km
Earthquakes over time
Cumulative count · 1 earthquakes · total moment ≈ M-0.1 · count moment
Depth (0 km at top). Grey: fixed depth.
Not enough depth data.
Magnitude distribution
Earthquakes
4
Largest
M-0.1
M3,0+
0
Depth range
0–10 km
Earthquakes over time
Cumulative count · 4 earthquakes · total moment ≈ M-0.0 · count moment
Depth (0 km at top). Grey: fixed depth.
Magnitude distribution
Depth cross-sections — color by age (orange=newest, grey=older), point size by M. Rising cluster = possible magma intrusion.
Earthquakes
15
Largest
M0.1
M3,0+
0
Depth range
0–12 km
Earthquakes over time
Cumulative count · 15 earthquakes · total moment ≈ M0.4 · count moment
Depth (0 km at top). Grey: fixed depth.
Magnitude distribution
Depth cross-sections — color by age (orange=newest, grey=older), point size by M. Rising cluster = possible magma intrusion.
Earthquakes
55
Largest
M0.4
M3,0+
0
Depth range
0–12 km
Earthquakes over time
Cumulative count · 55 earthquakes · total moment ≈ M0.8 · count moment
Depth (0 km at top). Grey: fixed depth.
Magnitude distribution
Depth cross-sections — color by age (orange=newest, grey=older), point size by M. Rising cluster = possible magma intrusion.
Earthquakes
637
Largest
M2.3
M3,0+
0
Depth range
0–13 km
Earthquakes over time
Cumulative count · 637 earthquakes · total moment ≈ M2.9 · count moment
Depth (0 km at top). Grey: fixed depth.
Magnitude distribution
Depth cross-sections — color by age (orange=newest, grey=older), point size by M. Rising cluster = possible magma intrusion.
Note: before February 2026 about half of events lacked an automatic magnitude, so magnitude-dependent figures (b-value, count of M≥X) under-count earlier periods — the catalogue is not homogeneous across this window. Cumulative moment is barely affected.
Earthquakes
6103
Largest
M3.4
M3,0+
4
Depth range
0–16 km
Earthquakes over time
Cumulative count · 6103 earthquakes · total moment ≈ M3.9 · count moment
Depth (0 km at top). Grey: fixed depth.
Magnitude distribution
Depth cross-sections — color by age (orange=newest, grey=older), point size by M. Rising cluster = possible magma intrusion.
Gutenberg-Richter b ≈ 1.25 ± 0.07 (i.e. likely 1.18–1.32, M≥1.7, n=242)
Note: before February 2026 about half of events lacked an automatic magnitude, so magnitude-dependent figures (b-value, count of M≥X) under-count earlier periods — the catalogue is not homogeneous across this window. Cumulative moment is barely affected.
Depth is automatic and uncertain; earthquakes alone do not show magma movement — deformation (GPS) and gas are needed. Grey points: automatic fixed-depth values. b-value computed for M≥1.5 (automatic magnitudes make lower completeness unreliable). Preliminary data.
🌊 Volcanic tremor — The seismic tremor baseline is normal and should only be compared to recent days since wi…
IMO tremor plot (station vog). Most of the signal is weather and surf — not eruption confirmation. All stations: vedur.is.
Weather now: wind 4 m/s (Fagradals-Hagafelli), waves 1.0 m — moderate.
The seismic tremor baseline is normal and should only be compared to recent days since wind and wave interference cannot be reliably filtered at this station. (AI)
Band analysis past 9 days (from digitized RSAM values). High 2-4 Hz + low 0.5-1 Hz = possible magma-movement signal; high 0.5-1 Hz without 2-4 Hz = weather/surf.
Earthquakes in the system
| Time (UTC) | Mag | Depth | Area |
|---|---|---|---|
| 2026-06-10 02:24 | M-0.1 | 0.0 | Reykjanesskagi |
| 2026-06-08 21:17 | M-1.3 | 0.0 | Reykjanesskagi Grindavík |
| 2026-06-08 20:48 | M-0.7 | 0.0 | Reykjanesskagi Grindavík |
| 2026-06-08 11:03 | M-1.0 | 9.9 | Reykjanesskagi Grindavík |
| 2026-06-08 02:54 | M-0.9 | 10.4 | Reykjanesskagi |
| 2026-06-07 00:54 | M-0.4 | 0.0 | Reykjanesskagi |
| 2026-06-06 05:26 | M-0.7 | 10.4 | Reykjanesskagi |
| 2026-06-06 04:50 | M-1.0 | 12.1 | Reykjanesskagi Grindavík |
| 2026-06-05 20:17 | M-0.5 | 7.0 | Reykjanesskagi |
| 2026-06-05 17:45 | M-1.0 | 11.8 | Reykjanesskagi Grindavík |
| 2026-06-05 11:31 | M-0.8 | 7.1 | Reykjanesskagi Grindavík |
| 2026-06-04 04:59 | M0.1 | 9.3 | Reykjanesskagi |
| 2026-06-03 22:48 | M-1.1 | 10.5 | Reykjanesskagi |
| 2026-06-03 15:54 | M-0.3 | 9.6 | Reykjanesskagi |
| 2026-06-03 10:05 | M-1.7 | 5.2 | Reykjanesskagi Grindavík |
| 2026-06-03 04:12 | M-0.8 | 4.0 | Reykjanesskagi |
| 2026-06-03 04:12 | M-1.9 | 5.6 | Reykjanesskagi Grindavík |
| 2026-06-03 03:53 | M-0.6 | 3.2 | Reykjanesskagi |
| 2026-06-03 03:53 | M-1.7 | 6.0 | Reykjanesskagi Grindavík |
| 2026-06-03 03:51 | M-2.0 | 5.2 | Reykjanesskagi Grindavík |
| 2026-06-03 03:49 | M0.3 | 4.5 | Reykjanesskagi Grindavík |
| 2026-06-03 03:49 | M-1.5 | 4.9 | Reykjanesskagi Grindavík |
| 2026-06-03 03:49 | M-2.1 | 6.1 | Reykjanesskagi Grindavík |
| 2026-06-03 03:49 | M-0.8 | 7.1 | Reykjanesskagi Grindavík |
| 2026-06-03 03:47 | M-2.2 | 5.2 | Reykjanesskagi Grindavík |
| 2026-06-03 03:46 | M-2.1 | 5.2 | Reykjanesskagi Grindavík |
| 2026-06-03 03:46 | M-1.2 | 7.1 | Reykjanesskagi Grindavík |
| 2026-06-03 03:36 | M-1.0 | 4.2 | Reykjanesskagi |
| 2026-06-03 03:31 | M-1.7 | 5.6 | Reykjanesskagi Grindavík |
| 2026-06-03 03:31 | M-0.7 | 6.8 | Reykjanesskagi Grindavík |
| 2026-06-03 03:30 | M-1.6 | 5.7 | Reykjanesskagi |
| 2026-06-03 03:29 | M-2.2 | 5.2 | Reykjanesskagi Grindavík |
| 2026-06-03 03:29 | M-1.1 | 7.4 | Reykjanesskagi Grindavík |
| 2026-06-03 03:28 | M-1.1 | 1.8 | Reykjanesskagi |
| 2026-06-03 03:24 | M-0.4 | 5.6 | Reykjanesskagi Grindavík |
| 2026-06-03 03:24 | M-1.7 | 7.0 | Reykjanesskagi Grindavík |
| 2026-06-02 04:56 | M-0.9 | 4.8 | Reykjanesskagi |
| 2026-05-31 07:31 | M-0.4 | 6.1 | Reykjanesskagi Grindavík |
| 2026-05-29 20:01 | M-0.7 | 6.7 | Reykjanesskagi Grindavík |
| 2026-05-29 19:10 | M-1.0 | 0.0 | Reykjanesskagi Grindavík |
| 2026-05-29 16:03 | M-0.6 | 6.6 | Reykjanesskagi |
| 2026-05-29 08:20 | M-1.1 | 9.6 | Reykjanesskagi |
| 2026-05-28 22:40 | M-0.9 | 9.8 | Reykjanesskagi |
| 2026-05-28 07:16 | M-1.4 | 11.9 | Reykjanesskagi |
| 2026-05-28 02:19 | M-1.1 | 10.8 | Reykjanesskagi |
| 2026-05-28 02:00 | M-1.4 | 10.0 | Reykjanesskagi |
| 2026-05-28 00:57 | M-0.8 | 4.6 | Reykjanesskagi Grindavík |
| 2026-05-27 21:31 | M-1.1 | 7.5 | Reykjanesskagi Grindavík |
| 2026-05-27 21:31 | M-0.8 | 2.2 | Reykjanesskagi Grindavík |
| 2026-05-27 21:30 | M-0.5 | 6.2 | Reykjanesskagi Grindavík |
| 2026-05-27 21:30 | M-1.0 | 5.2 | Reykjanesskagi |
| 2026-05-27 21:29 | M-0.3 | 5.8 | Reykjanesskagi Grindavík |
| 2026-05-27 16:48 | M0.2 | 8.5 | Reykjanesskagi |
| 2026-05-27 13:32 | M-0.6 | 11.0 | Reykjanesskagi |
| 2026-05-18 04:58 | M0.4 | 6.3 | Reykjanesskagi Grindavík |
| 2026-02-06 22:15 | M0.7 | 5.8 | Reykjanesskagi Grindavík |
| 2026-02-01 12:05 | M-0.8 | 8.9 | Reykjanesskagi |
| 2026-02-01 04:33 | M-0.8 | 9.9 | Reykjanesskagi |
| 2026-01-17 05:07 | – | 6.4 | Reykjanesskagi Grindavík |
| 2026-01-13 22:17 | – | 8.9 | Reykjanesskagi |
For the advanced — expert charts — Coulomb, migration, InSAR
🔬 Coulomb stress transfer — advanced analysis
4 earthquakes M≥3.0 in this window on this system. Such events transfer stress to neighbouring faults — some become more likely to slip, others less ("Coulomb stress transfer"). The Met Office does not publish focal mechanisms for automatically located events, so Skjálfti does not compute this itself — it requires strike/dip/rake data which is only available for M≥4.5 events in the GCMT catalogue.
For Coulomb analysis, see: USGS Coulomb 3.4 (stand-alone software) and focal mechanisms for Iceland in Global CMT.
For Coulomb analysis, see: USGS Coulomb 3.4 (stand-alone software) and focal mechanisms for Iceland in Global CMT.
📡 InSAR — ratsjár-aflögun yfir allt svæðið
InSAR is satellite radar from Sentinel-1: it measures deformation across the whole area, not just points like GNSS stations. Six-day interferograms reveal where the ground rose or subsided between passes. InSAR distinguishes vertical deformation (magma chamber inflation) from horizontal (dike intrusion) — GNSS alone cannot.
View latest interferograms and time-series at COMET LiCS portal (Sentinel-1, ~4-6 day lag).
View latest interferograms and time-series at COMET LiCS portal (Sentinel-1, ~4-6 day lag).
What do the numbers mean — and what should I do?
β (swarm signal): how high activity is versus the area's 2-year average. β above 2 means an ongoing swarm. It measures activity, not a forecast of a large quake.
Cumulative moment (Mw): the combined energy of the quakes in the period. Uplift (GNSS): whether the ground is rising or sinking, mm per year — the data are a few weeks old. Some systems (e.g. Svartsengi) deform in steps during eruption cycles rather than at a steady annual rate.
Swarm character is computed for a whole volcanic belt, not a single system — it describes the belt, not necessarily this one system.
What should I do? This is automatic monitoring for information — not an official warning. Follow official information from the Icelandic Met Office and Civil Protection (112).
Data: Icelandic Met Office (Skjálftalísa API), automatic preliminary results — may change. This is not an official warning. Official warnings: vedur.is and Civil Protection (112).