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. Volcano is in normal, non-eruptive state.
VONA = Volcano Observatory Notice for Aviation; the official Met Office colour code for aviation. Independent of Skjálfti's automatic analysis.
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
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
4
Largest
M1.1
M3,0+
0
Depth range
0–12 km
Earthquakes over time
Cumulative count · 4 earthquakes · total moment ≈ M1.4 · 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
20
Largest
M1.3
M3,0+
0
Depth range
0–12 km
Earthquakes over time
Cumulative count · 20 earthquakes · total moment ≈ M1.7 · 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
38
Largest
M1.3
M3,0+
0
Depth range
0–15 km
Earthquakes over time
Cumulative count · 38 earthquakes · total moment ≈ M1.7 · 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
61
Largest
M1.3
M3,0+
0
Depth range
0–16 km
Earthquakes over time
Cumulative count · 61 earthquakes · total moment ≈ M1.8 · 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.
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
168
Largest
M2.6
M3.0+
0
Days with data
140
This is a reduced view: it is built from the daily aggregate (counts, moment, magnitude bands, depth histogram) rather than individual events. Map points, the depth scatter, cross-sections and the migration fit are therefore missing — they need each event's location and depth. Counts, total moment and the b-value are exact, not approximated.
Earthquakes over time
Cumulative count and moment
Total moment of all events in the window equals a single Mw 2.8
Magnitude distribution
<1116
1–227
2–32
3–40
≥40
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
307
Largest
M2.6
M3.0+
0
Days with data
260
This is a reduced view: it is built from the daily aggregate (counts, moment, magnitude bands, depth histogram) rather than individual events. Map points, the depth scatter, cross-sections and the migration fit are therefore missing — they need each event's location and depth. Counts, total moment and the b-value are exact, not approximated.
Earthquakes over time
Cumulative count and moment
Total moment of all events in the window equals a single Mw 2.9
Magnitude distribution
<1235
1–246
2–33
3–40
≥40
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
658
Largest
M3.9
M3.0+
2
Days with data
510
This is a reduced view: it is built from the daily aggregate (counts, moment, magnitude bands, depth histogram) rather than individual events. Map points, the depth scatter, cross-sections and the migration fit are therefore missing — they need each event's location and depth. Counts, total moment and the b-value are exact, not approximated.
Earthquakes over time
Cumulative count and moment
Total moment of all events in the window equals a single Mw 4.0
Magnitude distribution
<1402
1–2200
2–331
3–42
≥40
Gutenberg-Richter b ≈ 1.04 ± 0.13 (i.e. likely 0.91–1.16, M≥1.7, n=65)
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
904
Largest
M3.9
M3.0+
8
Days with data
629
This is a reduced view: it is built from the daily aggregate (counts, moment, magnitude bands, depth histogram) rather than individual events. Map points, the depth scatter, cross-sections and the migration fit are therefore missing — they need each event's location and depth. Counts, total moment and the b-value are exact, not approximated.
Earthquakes over time
Cumulative count and moment
Total moment of all events in the window equals a single Mw 4.2
Magnitude distribution
<1437
1–2353
2–381
3–48
≥40
Gutenberg-Richter b ≈ 0.88 ± 0.06 (i.e. likely 0.82–0.94, M≥1.7, n=150)
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 |
|---|---|---|---|
| 2026-08-08 02:27 | M0.9 | 10.9 | Other areas |
| 2026-08-05 04:31 | M0.5 | 0.2 | Other areas |
| 2026-07-21 01:06 | M1.1 | 9.7 | Other areas |
| 2026-07-01 11:42 | M1.0 | 11.6 | Other areas |
| 2026-06-07 19:48 | M-0.1 | 4.7 | Other areas |
| 2026-06-05 06:51 | M0.8 | 8.6 | Other areas |
| 2026-06-01 05:04 | M0.3 | 9.2 | Other areas |
| 2026-05-30 22:21 | M0.5 | 7.6 | Other areas |
| 2026-05-28 08:55 | M0.7 | 4.2 | Other areas |
| 2026-05-14 20:57 | M0.6 | 9.5 | Other areas |
| 2026-05-14 20:42 | M0.5 | 9.0 | Other areas |
| 2026-05-05 05:56 | M0.3 | 7.0 | Other areas |
| 2026-04-26 22:43 | M0.5 | 7.0 | Other areas |
| 2026-04-25 21:04 | M0.5 | 0.8 | Other areas |
| 2026-04-25 04:03 | M1.3 | 1.2 | Other areas |
| 2026-04-24 06:24 | M0.8 | 0.2 | Other areas |
| 2026-04-24 05:47 | M0.2 | 0.4 | Other areas |
| 2026-04-07 21:32 | M0.8 | 7.3 | Other areas |
| 2026-04-07 05:55 | M0.7 | 11.1 | Other areas |
| 2026-04-04 14:31 | M1.0 | 0.3 | Other areas |
| 2026-03-04 17:04 | M0.3 | 9.4 | 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 |
| 2024-10-16 09:05 | – | 9.2 | Other areas |
| 2024-10-12 16:56 | M0.2 | 8.3 | Other areas |
| 2024-10-07 01:02 | M0.4 | 3.6 | 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).