Hofsjökull
Seismicity by period · derived statistics from Skjálftalísa (Icelandic Met Office)
Status (automatic)
No particular signs of unrest in the last 24 hours — 0 earthquakes recorded, within the system's normal range.Large central volcano beneath the namesake glacier in the central highlands. No eruptions in historical time. (overview — more at vedur.is) · circle on the map = rough outline of the system (radius).
Subglacial system: a subglacial eruption can cause a jökulhlaup (sudden glacial meltwater flood) with little warning, and volcanic gases (incl. SO₂, CO₂) can be dangerous near vents and may pool in hollows. These are standing features of the system, not a sign of an imminent eruption.
📜 Did you know?
Beneath Hofsjökull lies the largest active central volcano in Iceland by area, with a large caldera under the south-western part of the ice cap. Even so, no eruption has occurred there in recorded history, the last effusive eruption being about 3,000–4,500 years ago. The glacier is the source of the Þjórsá, Iceland's longest river (about 230 km).
Points = earthquake locations in the selected window, coloured by magnitude: M3+ · M2+ · smaller (a sample if more than 800).
Earthquakes
0
Largest
–
M3,0+
0
Depth range
–
Earthquakes over time
Cumulative count · 0 earthquakes · count moment
Depth (0 km at top).
Not enough depth data.
Magnitude distribution
Earthquakes
0
Largest
–
M3,0+
0
Depth range
–
Earthquakes over time
Cumulative count · 0 earthquakes · count moment
Depth (0 km at top).
Not enough depth data.
Magnitude distribution
Earthquakes
0
Largest
–
M3,0+
0
Depth range
–
Earthquakes over time
Cumulative count · 0 earthquakes · count moment
Depth (0 km at top).
Not enough depth data.
Magnitude distribution
Earthquakes
2
Largest
M1.3
M3,0+
0
Depth range
0–0 km
Earthquakes over time
Cumulative count · 2 earthquakes · total moment ≈ M1.4 · count moment
Depth (0 km at top). Grey: fixed depth.
Not enough depth data.
Magnitude distribution
Earthquakes
101
Largest
M2.7
M3,0+
0
Depth range
0–19 km
Earthquakes over time
Cumulative count · 101 earthquakes · total moment ≈ M3.0 · count moment
Depth (0 km at top) — shallowing in the data (6.7→2.7 km). 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
203
Largest
M2.7
M3,0+
0
Depth range
0–20 km
Earthquakes over time
Cumulative count · 203 earthquakes · total moment ≈ M3.2 · 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.
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.
Earthquakes in the system
| Time (UTC) | Mag | Depth (km) | Area |
|---|---|---|---|
| 2026-07-11 08:20 | M1.1 | 0.0 | Other areas |
| 2026-07-06 20:44 | M1.3 | 0.0 | Other areas |
| 2026-06-08 03:34 | M1.1 | 8.0 | Other areas |
| 2026-06-07 15:15 | M1.1 | 1.1 | Other areas |
| 2026-06-01 16:47 | M1.7 | 0.0 | Other areas |
| 2026-05-31 18:29 | M1.4 | 0.0 | Other areas |
| 2026-05-21 12:31 | M2.1 | 3.0 | Other areas |
| 2026-05-18 20:42 | M1.0 | 1.4 | Other areas |
| 2026-05-18 20:40 | M1.9 | 1.7 | Other areas |
| 2026-05-17 23:47 | M0.9 | 11.1 | Other areas |
| 2026-05-17 22:30 | M1.8 | 1.6 | Other areas |
| 2026-05-17 15:08 | M1.3 | 1.6 | Other areas |
| 2026-05-05 12:50 | M0.6 | 1.6 | Other areas |
| 2026-05-03 20:27 | M0.5 | 5.2 | Other areas |
| 2026-05-03 06:52 | M1.6 | 0.8 | Other areas |
| 2026-05-01 03:28 | M0.8 | 1.8 | Other areas |
| 2026-04-30 20:44 | M1.7 | 3.3 | Other areas |
| 2026-04-30 04:24 | M2.1 | 2.3 | Other areas |
| 2026-04-26 00:14 | M2.4 | 2.7 | Other areas |
| 2026-04-26 00:07 | M2.7 | 2.2 | Other areas |
| 2026-04-23 21:06 | M1.6 | 0.8 | Other areas |
| 2026-04-21 23:25 | M1.5 | 3.8 | Other areas |
| 2026-04-20 20:09 | M1.0 | 1.1 | Other areas |
| 2026-04-19 11:48 | M0.6 | 1.1 | Other areas |
| 2026-04-16 22:29 | M0.9 | 6.5 | Other areas |
| 2026-04-09 08:52 | M1.1 | 3.0 | Other areas |
| 2026-03-30 02:51 | M1.1 | 2.6 | Other areas |
| 2026-03-26 03:33 | M2.0 | 3.5 | Other areas |
| 2026-03-18 21:41 | M1.4 | 2.4 | Other areas |
| 2026-02-25 04:38 | M0.8 | 10.8 | Other areas |
| 2026-02-23 09:50 | M0.9 | 8.3 | Other areas |
| 2026-02-17 15:05 | M1.3 | 5.1 | Other areas |
| 2026-01-15 17:41 | – | 3.3 | Other areas |
| 2026-01-07 08:07 | M0.8 | 2.6 | Other areas |
| 2026-01-01 19:22 | M1.3 | 2.8 | Other areas |
| 2025-12-18 17:57 | M1.6 | 19.0 | Other areas |
| 2025-12-13 16:50 | M1.2 | 1.1 | Other areas |
| 2025-12-13 08:10 | – | 3.5 | Other areas |
| 2025-12-11 06:04 | M1.7 | 2.2 | Other areas |
| 2025-12-11 06:04 | – | 8.2 | Other areas |
| 2025-11-27 00:36 | – | 10.4 | Other areas |
| 2025-11-17 13:31 | – | 3.5 | Other areas |
| 2025-11-13 01:39 | – | 9.3 | Other areas |
| 2025-11-07 17:33 | – | 11.8 | Other areas |
| 2025-11-04 09:27 | – | 3.0 | Other areas |
| 2025-11-02 11:43 | M0.9 | 1.2 | Other areas |
| 2025-10-31 12:43 | M2.0 | 0.4 | Other areas |
| 2025-10-31 12:42 | M2.0 | 1.1 | Other areas |
| 2025-10-28 07:28 | – | 3.6 | Other areas |
| 2025-10-18 21:40 | – | 7.6 | Other areas |
| 2025-10-16 13:48 | – | 3.7 | Other areas |
| 2025-10-16 03:13 | – | 7.5 | Other areas |
| 2025-10-12 12:34 | – | 3.1 | Other areas |
| 2025-10-05 22:10 | – | 7.6 | Other areas |
| 2025-10-01 05:02 | – | 12.0 | Other areas |
| 2025-09-28 00:14 | M0.7 | 3.1 | Other areas |
| 2025-09-25 15:52 | M1.4 | 5.3 | Other areas |
| 2025-09-22 04:20 | – | 19.1 | Other areas |
| 2025-09-18 15:06 | – | 3.5 | Other areas |
| 2025-09-18 01:11 | M0.8 | 1.1 | Other areas |
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).