Fremrinámur
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 east of Mývatn in the Northern Volcanic Zone. Last erupted ~2800 years ago. (overview — more at vedur.is) · circle on the map = rough outline of the system (radius).
📜 Did you know?
Fremrinámur is a volcanic system in the Northern Volcanic Zone, east of Lake Mývatn, named for the sulfur mining carried out there into the 19th century. The system covers about 75 km² and has not erupted in historical time — its last known eruption was roughly 2,800 years ago (around 800 BC, uncertain).
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
1
Largest
M1.3
M3,0+
0
Depth range
8–8 km
Earthquakes over time
Cumulative count · 1 earthquakes · total moment ≈ M1.3 · count moment
Depth (0 km at top).
Not enough depth data.
Magnitude distribution
Earthquakes
4
Largest
M1.3
M3,0+
0
Depth range
5–12 km
Earthquakes over time
Cumulative count · 4 earthquakes · total moment ≈ M1.5 · 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
48
Largest
M2.4
M3,0+
0
Depth range
1–16 km
Earthquakes over time
Cumulative count · 48 earthquakes · total moment ≈ M2.5 · count moment
Depth (0 km at top) — shallowing in the data (7.7→6.5 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
69
Largest
M2.4
M3,0+
0
Depth range
1–16 km
Earthquakes over time
Cumulative count · 69 earthquakes · total moment ≈ M2.5 · 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 |
|---|---|---|---|
| 2026-07-21 01:06 | M1.3 | 7.6 | Other areas |
| 2026-07-10 01:30 | M0.4 | 5.0 | Other areas |
| 2026-07-01 11:42 | M1.1 | 9.7 | Other areas |
| 2026-06-30 21:36 | M1.2 | 12.2 | Other areas |
| 2026-06-14 00:04 | M2.4 | 7.9 | Other areas |
| 2026-06-13 20:11 | M1.7 | 6.5 | Other areas |
| 2026-06-07 19:48 | M-0.1 | 4.7 | Other areas |
| 2026-06-05 06:51 | M0.4 | 8.6 | Other areas |
| 2026-06-01 05:04 | M0.4 | 4.7 | Other areas |
| 2026-06-01 05:04 | M0.3 | 8.4 | Other areas |
| 2026-05-30 22:21 | M0.0 | 7.6 | Other areas |
| 2026-05-28 08:55 | M0.4 | 3.5 | Other areas |
| 2026-05-14 20:57 | M0.7 | 10.3 | Other areas |
| 2026-05-14 20:42 | M0.4 | 9.1 | Other areas |
| 2026-05-05 05:56 | M0.0 | 7.1 | Other areas |
| 2026-04-26 22:43 | M0.6 | 5.0 | Other areas |
| 2026-04-25 21:04 | M0.8 | 2.6 | Other areas |
| 2026-04-25 04:03 | M1.0 | 2.7 | Other areas |
| 2026-04-24 06:24 | M0.7 | 11.6 | Other areas |
| 2026-04-24 05:47 | M0.0 | 6.2 | Other areas |
| 2026-04-07 21:32 | M0.9 | 4.7 | Other areas |
| 2026-04-07 05:55 | M0.8 | 6.0 | Other areas |
| 2026-04-04 14:31 | M1.3 | 1.1 | Other areas |
| 2026-03-04 17:04 | M0.3 | 6.5 | Other areas |
| 2026-02-01 04:41 | – | 6.4 | Other areas |
| 2026-01-16 15:20 | – | 15.1 | Other areas |
| 2026-01-06 07:17 | M0.5 | 2.3 | Other areas |
| 2026-01-04 03:07 | – | 6.3 | Other areas |
| 2025-12-24 22:05 | M0.7 | 6.1 | Other areas |
| 2025-12-07 21:11 | M0.4 | 7.2 | Other areas |
| 2025-11-29 04:27 | – | 14.5 | Other areas |
| 2025-11-29 03:34 | – | 5.0 | Other areas |
| 2025-11-28 03:55 | – | 7.8 | Other areas |
| 2025-11-25 16:53 | – | 8.1 | Other areas |
| 2025-11-21 01:29 | – | 10.6 | Other areas |
| 2025-10-24 17:37 | – | 7.6 | Other areas |
| 2025-10-18 05:53 | M0.3 | 4.9 | Other areas |
| 2025-10-06 22:07 | M0.5 | 7.2 | Other areas |
| 2025-10-03 03:24 | M0.3 | 8.5 | Other areas |
| 2025-09-28 07:26 | M0.1 | 8.7 | Other areas |
| 2025-09-15 16:42 | – | 5.4 | Other areas |
| 2025-09-10 02:24 | M0.3 | 8.8 | Other areas |
| 2025-08-17 11:51 | – | 7.6 | Other areas |
| 2025-08-10 18:08 | M0.7 | 16.2 | Other areas |
| 2025-08-10 06:50 | – | 9.2 | Other areas |
| 2025-08-03 16:44 | – | 8.0 | Other areas |
| 2025-07-29 09:59 | – | 7.9 | Other areas |
| 2025-07-29 09:59 | M0.5 | 5.3 | Other areas |
| 2025-07-21 03:17 | M0.4 | 4.9 | Other areas |
| 2025-07-14 04:18 | M0.2 | 5.5 | Other areas |
| 2025-06-19 13:09 | M0.5 | 5.3 | Other areas |
| 2025-06-10 21:08 | M0.6 | 1.1 | Other areas |
| 2025-05-25 15:09 | M1.1 | 5.2 | Other areas |
| 2025-04-15 23:16 | – | 9.2 | Other areas |
| 2025-04-04 04:00 | M0.0 | 8.9 | Other areas |
| 2025-01-12 11:25 | M0.0 | 7.8 | Other areas |
| 2024-12-03 17:49 | – | 3.2 | Other areas |
| 2024-11-05 11:20 | M0.7 | 8.1 | Other areas |
| 2024-10-27 14:21 | – | 7.1 | Other areas |
| 2024-10-19 22:25 | M0.3 | 5.4 | 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).