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Ljósufjöll

Seismicity by period · derived statistics from Skjálftalísa (Icelandic Met Office)
Status (automatic)
No particular signs of unrest in the last 24 hours — 9 earthquakes recorded, within the system's normal range.
🕰️ Last eruption / event — ~1066 years ago
Rauðhálsahraun (around 960) (~960). The only eruption in the Snæfellsnes belt in recorded Icelandic history — a basaltic eruption around 960 AD that produced the roughly 13 km² Rauðhálsahraun lava field. The system has erupted about every 400 years during the Holocene.
Volcanic system on the eastern Snæfellsnes Peninsula (~90 km long, WNW–ESE). Last erupted around 960 AD. Increased seismicity and likely deep magma accumulation at 15–20 km depth near Grjótárvatn in 2024–2025; the Met Office raised the monitoring level. (overview — more at vedur.is) · circle on the map = rough outline of the system (radius).
📜 Did you know?
Berserkjahraun (~960 AD) is mentioned in Eyrbyggja saga (chapter 28) — the Swedish berserkers Halli and Leiknir were made to clear a path through the lava and were then killed by Víga-Styr. The track is still visible. Increased seismicity and likely magma accumulation at 18-25 km depth near Grjótárvatn in 2024-2025 — the Met Office raised the monitoring level.
Historical eruptions in the system — points colored by size, blue circle shows where we are now in time.
10001100120013001400150016001700180019002000~960 e.Kr.nowsmallmediumlarge
Points = earthquake locations in the selected window, coloured by magnitude: ● M3+ · ● M2+ · ● smaller (a sample if more than 800).
Earthquakes
9
Largest
M1.9
M3,0+
0
Depth range
0–17 km
Earthquakes over time
609:2014:0818:5623:4404:3209:20
Cumulative count · 9 earthquakes · total moment ≈ M2.1 · count moment
n=90M2.1009:2014:0818:5623:4404:3209:20
Depth (0 km at top). Grey: fixed depth.
0km9km17km09:2014:0818:5623:4404:3209:20
Magnitude distribution
3<161–202–303–40≥4
Depth cross-sections — color by age (orange=newest, grey=older), point size by M. Rising cluster = possible magma intrusion.
0km9km17km22.05°W21.99°W21.94°W21.88°W21.82°WE-W
0km9km17km64.69°N64.73°N64.76°N64.80°N64.84°NN-S
Earthquakes
13
Largest
M1.9
M3,0+
0
Depth range
0–17 km
Earthquakes over time
608.0608.0609.0609.0609.0610.06
Cumulative count · 13 earthquakes · total moment ≈ M2.2 · count moment
n=130M2.2008.0608.0609.0609.0609.0610.06
Depth (0 km at top). Grey: fixed depth.
0km9km17km08.0608.0609.0609.0609.0610.06
Magnitude distribution
6<171–202–303–40≥4
Depth cross-sections — color by age (orange=newest, grey=older), point size by M. Rising cluster = possible magma intrusion.
0km9km17km22.20°W22.11°W22.01°W21.92°W21.82°WE-W
0km9km17km64.69°N64.73°N64.76°N64.80°N64.84°NN-S
Earthquakes
40
Largest
M1.9
M3,0+
0
Depth range
0–23 km
Earthquakes over time
803.0604.0606.0607.0608.0610.06
Cumulative count · 40 earthquakes · total moment ≈ M2.3 · count moment
n=400M2.3003.0604.0606.0607.0608.0610.06
No significant hypocenter migration — activity is stationary (R²=0.07, n=40); no sign of a propagating dike. Migration shows automatically if R²≥0.30.
Depth (0 km at top). Grey: fixed depth.
0km12km23km03.0604.0606.0607.0608.0610.06
Magnitude distribution
25<1151–202–303–40≥4
Depth cross-sections — color by age (orange=newest, grey=older), point size by M. Rising cluster = possible magma intrusion.
0km12km23km22.26°W22.13°W21.99°W21.86°W21.73°WE-W
0km12km23km64.69°N64.73°N64.76°N64.80°N64.84°NN-S
Earthquakes
120
Largest
M2.1
M3,0+
0
Depth range
0–23 km
Earthquakes over time
1011.0517.0523.0529.0504.0610.06
Cumulative count · 120 earthquakes · total moment ≈ M2.6 · count moment
n=1200M2.6011.0517.0523.0529.0504.0610.06
Depth (0 km at top). Grey: fixed depth.
0km12km23km11.0517.0523.0529.0504.0610.06
Magnitude distribution
77<1421–212–303–40≥4
Depth cross-sections — color by age (orange=newest, grey=older), point size by M. Rising cluster = possible magma intrusion.
0km12km23km22.73°W22.47°W22.21°W21.95°W21.69°WE-W
0km12km23km64.69°N64.74°N64.80°N64.85°N64.90°NN-S
Earthquakes
2306
Largest
M3.1
M3,0+
3
Depth range
0–24 km
Earthquakes over time
15410.0622.0803.1115.0129.0310.06
Cumulative count · 2306 earthquakes · total moment ≈ M3.7 · count moment
n=23060M3.7010.0622.0803.1115.0129.0310.06
Depth (0 km at top). Grey: fixed depth.
0km12km24km10.0622.0803.1115.0129.0310.06
Magnitude distribution
984<16721–2352–333–40≥4
Depth cross-sections — color by age (orange=newest, grey=older), point size by M. Rising cluster = possible magma intrusion.
0km12km24km22.84°W22.55°W22.26°W21.97°W21.68°WE-W
0km12km24km64.69°N64.74°N64.80°N64.85°N64.90°NN-S
Gutenberg-Richter b ≈ 1.57 ± 0.14 (i.e. likely 1.42–1.71, M≥1.7, n=131)
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
4115
Largest
M3.6
M3,0+
6
Depth range
0–25 km
Earthquakes over time
24410.0603.1129.0322.0815.0110.06
Cumulative count · 4115 earthquakes · total moment ≈ M4.0 · count moment
n=41150M4.0010.0603.1129.0322.0815.0110.06
Depth (0 km at top). Grey: fixed depth.
0km12km25km10.0603.1129.0322.0815.0110.06
Magnitude distribution
1269<116111–2992–363–40≥4
Depth cross-sections — color by age (orange=newest, grey=older), point size by M. Rising cluster = possible magma intrusion.
0km12km25km22.84°W22.55°W22.27°W21.98°W21.70°WE-W
0km12km25km64.68°N64.74°N64.79°N64.85°N64.90°NN-S
Gutenberg-Richter b ≈ 1.56 ± 0.09 (i.e. likely 1.47–1.64, M≥1.7, n=341)
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.

Glossary & magnitude scale →

Earthquakes in the system

Time (UTC)MagDepthArea
2026-06-10 07:40M-1.017.4Önnur svæði
2026-06-10 07:38M1.41.1Önnur svæði
2026-06-10 07:38M1.99.4Önnur svæði
2026-06-10 07:38M1.77.1Önnur svæði
2026-06-10 07:37M1.50.0Önnur svæði
2026-06-10 07:37M1.213.0Önnur svæði
2026-06-10 03:59M0.81.1Önnur svæði
2026-06-10 02:49M1.210.8Önnur svæði
2026-06-10 00:19M0.415.7Önnur svæði
2026-06-09 07:37M0.80.0Önnur svæði
2026-06-08 20:33M-0.35.2Önnur svæði
2026-06-08 19:59M0.78.0Önnur svæði
2026-06-08 19:59M1.57.3Önnur svæði
2026-06-08 06:07M-0.15.2Önnur svæði
2026-06-08 06:07M-0.719.8Önnur svæði
2026-06-08 02:13M0.65.2Önnur svæði
2026-06-08 02:13M-0.118.2Önnur svæði
2026-06-08 02:08M1.516.7Önnur svæði
2026-06-08 02:08M1.618.1Önnur svæði
2026-06-08 01:59M1.20.0Önnur svæði
2026-06-08 01:59M1.316.7Önnur svæði
2026-06-08 00:59M1.00.0Önnur svæði
2026-06-08 00:59M1.017.0Önnur svæði
2026-06-07 09:15M-0.323.1Önnur svæði
2026-06-07 07:38M0.89.9Önnur svæði
2026-06-06 17:08M0.87.8Önnur svæði
2026-06-06 16:18M0.50.0Önnur svæði
2026-06-05 22:37M0.97.2Önnur svæði
2026-06-05 21:01M0.50.0Önnur svæði
2026-06-05 21:01M0.75.2Önnur svæði
2026-06-04 23:37M1.21.1Önnur svæði
2026-06-04 23:37M0.919.1Önnur svæði
2026-06-04 16:57M-0.317.2Önnur svæði
2026-06-04 16:57M-0.719.4Önnur svæði
2026-06-04 03:26M-0.90.0Önnur svæði
2026-06-04 01:11M1.114.4Önnur svæði
2026-06-04 01:11M1.115.5Önnur svæði
2026-06-03 17:02M0.95.2Önnur svæði
2026-06-03 14:33M0.91.1Önnur svæði
2026-06-03 10:15M0.10.0Önnur svæði
2026-06-03 09:19M-0.40.0Önnur svæði
2026-06-03 07:38M1.01.1Önnur svæði
2026-06-03 07:38M0.020.3Önnur svæði
2026-06-03 05:40M1.017.6Önnur svæði
2026-06-03 05:40M1.419.6Önnur svæði
2026-06-03 05:10M0.50.0Önnur svæði
2026-06-03 04:08M-0.35.2Önnur svæði
2026-06-03 04:08M0.10.8Önnur svæði
2026-06-03 01:26M0.13.0Önnur svæði
2026-06-02 14:35M1.50.0Önnur svæði
2026-06-02 08:59M-0.614.7Önnur svæði
2026-06-02 06:17M0.410.9Önnur svæði
2026-06-02 03:49M-0.617.9Önnur svæði
2026-06-02 01:01M1.113.7Önnur svæði
2026-06-02 01:01M1.415.6Önnur svæði
2026-06-01 20:51M0.30.0Önnur svæði
2026-06-01 16:25M1.50.0Önnur svæði
2026-06-01 15:25M1.70.0Önnur svæði
2026-06-01 11:57M0.70.0Önnur svæði
2026-05-31 16:51M0.40.0Önnur svæði

System journal

Automatic snapshots and media coverage, in chronological order. Subscribe: RSS · ntfy skjalftar-ljosufjoll
2026-05-30 08:47:03 UTC
In the last 24 hours, three earthquakes were recorded in the Ljósufjöll system, representing an increase above the weekly average and unusual activity for this area. The activity is characterized by distributed background seismicity rather than swarms and most closely resembles the period around October 22, 2024. These automatic preliminary results show that the largest earthquake in the past 48 hours was M1.4 with a cumulative magnitude of Mw 1.5. Further details on trends and measurements are available below.
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).