Þeistareykir
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.Volcanic system in the Northern Volcanic Zone with a geothermal power station. Last erupted millennia ago. (overview — more at vedur.is) · circle on the map = rough outline of the system (radius).
📜 Did you know?
Beneath Þeistareykir in the Northern Volcanic Zone lies a powerful geothermal field that drives a 90 MW geothermal power station (commissioned 2017). Crystals in the Borgarhraun lava have become a natural laboratory: they show that the magma rose from the Earth's mantle, from more than 20 km depth, in only days to months (Mutch et al., 2019).
Historical eruptions in the system — points colored by size, blue circle shows where we are now in time.
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
5
Largest
M1.1
M3,0+
0
Depth range
4–15 km
Earthquakes over time
Cumulative count · 5 earthquakes · total moment ≈ M1.2 · count moment
Depth (0 km at top).
Magnitude distribution
Depth cross-sections — color by age (orange=newest, grey=older), point size by M. Rising cluster = possible magma intrusion.
Earthquakes
11
Largest
M1.1
M3,0+
0
Depth range
3–15 km
Earthquakes over time
Cumulative count · 11 earthquakes · total moment ≈ M1.4 · 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
139
Largest
M1.7
M3,0+
0
Depth range
1–18 km
Earthquakes over time
Cumulative count · 139 earthquakes · total moment ≈ M2.0 · 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.
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
342
Largest
M1.7
M3,0+
0
Depth range
1–18 km
Earthquakes over time
Cumulative count · 342 earthquakes · total moment ≈ M2.1 · 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 | Area |
|---|---|---|---|
| 2026-06-07 07:34 | M0.8 | 10.4 | Tjörnes / N-land |
| 2026-06-07 05:46 | M0.5 | 14.3 | Önnur svæði |
| 2026-06-06 12:26 | M-0.4 | 15.1 | Önnur svæði |
| 2026-06-05 20:31 | M1.1 | 4.5 | Önnur svæði |
| 2026-06-04 14:02 | M0.2 | 4.9 | Önnur svæði |
| 2026-05-30 08:54 | M0.7 | 4.0 | Önnur svæði |
| 2026-05-26 17:07 | M0.5 | 4.0 | Önnur svæði |
| 2026-05-25 10:53 | M0.8 | 2.7 | Önnur svæði |
| 2026-05-19 05:50 | M0.6 | 4.0 | Önnur svæði |
| 2026-05-19 05:47 | M0.5 | 4.5 | Önnur svæði |
| 2026-05-13 18:18 | M0.1 | 5.1 | Önnur svæði |
| 2026-05-11 00:58 | M0.8 | 5.4 | Önnur svæði |
| 2026-05-10 20:47 | M0.8 | 4.3 | Önnur svæði |
| 2026-05-08 12:25 | M0.4 | 6.7 | Tjörnes / N-land |
| 2026-05-04 16:44 | M0.8 | 4.3 | Önnur svæði |
| 2026-04-27 21:16 | M0.0 | 5.2 | Önnur svæði |
| 2026-04-27 21:16 | M0.9 | 2.9 | Önnur svæði |
| 2026-04-25 17:34 | M0.2 | 11.0 | Önnur svæði |
| 2026-04-25 02:13 | M1.0 | 3.6 | Önnur svæði |
| 2026-04-25 01:33 | M1.1 | 3.1 | Önnur svæði |
| 2026-04-24 14:52 | M0.4 | 3.4 | Önnur svæði |
| 2026-04-23 12:43 | M0.0 | 5.4 | Önnur svæði |
| 2026-04-19 03:49 | M0.8 | 4.4 | Önnur svæði |
| 2026-04-18 17:17 | M0.0 | 4.3 | Önnur svæði |
| 2026-04-14 03:58 | M0.1 | 4.4 | Önnur svæði |
| 2026-04-12 23:30 | M0.6 | 5.4 | Tjörnes / N-land |
| 2026-04-12 19:08 | M0.0 | 5.5 | Tjörnes / N-land |
| 2026-04-09 14:01 | M0.0 | 11.8 | Önnur svæði |
| 2026-04-05 14:03 | M0.9 | 4.4 | Önnur svæði |
| 2026-04-04 01:40 | M0.0 | 3.3 | Önnur svæði |
| 2026-03-20 10:05 | M0.2 | 3.9 | Önnur svæði |
| 2026-03-13 04:58 | M0.6 | 4.3 | Önnur svæði |
| 2026-03-13 01:56 | M0.5 | 4.1 | Önnur svæði |
| 2026-03-12 07:43 | M1.1 | 0.7 | Önnur svæði |
| 2026-03-10 16:28 | M0.2 | 4.2 | Önnur svæði |
| 2026-03-06 22:26 | M0.3 | 4.3 | Önnur svæði |
| 2026-02-25 15:13 | M0.9 | 7.2 | Tjörnes / N-land |
| 2026-02-14 12:11 | M0.1 | 2.7 | Önnur svæði |
| 2026-02-14 12:10 | M0.6 | 2.8 | Önnur svæði |
| 2026-02-14 12:07 | M0.2 | 2.8 | Önnur svæði |
| 2026-02-14 12:06 | M0.9 | 2.6 | Önnur svæði |
| 2026-02-11 15:02 | M0.2 | 2.0 | Önnur svæði |
| 2026-02-06 07:16 | M0.5 | 4.1 | Önnur svæði |
| 2026-01-30 02:44 | – | 3.6 | Önnur svæði |
| 2026-01-29 11:46 | – | 11.1 | Tjörnes / N-land |
| 2026-01-28 11:48 | – | 4.0 | Önnur svæði |
| 2026-01-28 07:56 | – | 3.5 | Önnur svæði |
| 2026-01-28 06:12 | – | 3.7 | Önnur svæði |
| 2026-01-25 12:22 | – | 4.4 | Önnur svæði |
| 2026-01-24 20:26 | M0.2 | 3.9 | Önnur svæði |
| 2026-01-24 03:05 | – | 4.0 | Önnur svæði |
| 2026-01-24 02:55 | – | 4.0 | Önnur svæði |
| 2026-01-14 07:55 | – | 4.4 | Önnur svæði |
| 2026-01-14 07:55 | – | 4.4 | Önnur svæði |
| 2026-01-07 17:58 | – | 4.0 | Önnur svæði |
| 2026-01-02 07:41 | M0.4 | 1.1 | Önnur svæði |
| 2025-12-26 16:40 | – | 4.2 | Önnur svæði |
| 2025-12-24 15:03 | – | 4.2 | Önnur svæði |
| 2025-12-03 04:48 | M1.0 | 4.0 | Tjörnes / N-land |
| 2025-12-02 20:25 | – | 3.9 | Önnur svæði |
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).