Hrómundartindur

Seismicity by period · derived statistics from Skjálftalísa (Icelandic Met Office)

Status (automatic)

No particular signs of unrest in the last 24 hours — 1 earthquake recorded, within the system's normal range.

Small volcanic system east of Hengill, often treated as separate from the Hengill system (GVP 371051). Independent magma intrusions were detected in 1994 — magma movement at 5–7 km depth but did not reach the surface. Strong geothermal activity at Ölkelduháls and Bitra. No known Holocene eruptions. (overview — more at vedur.is) · circle on the map = rough outline of the system (radius).

📜 Did you know?

Hrómundartindur is a separate volcanic system east of Hengill that hosts the Ölkelduháls geothermal field (Global Volcanism Program no. 371051). Between 1994 and 1999 a magma intrusion caused about 8–10 cm of uplift at Ölkelduháls — but no eruption followed. The system has not erupted for millennia and is distinct from Hengill despite their close proximity.

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Points = earthquake locations in the selected window, coloured by magnitude: ● M3+ · ● M2+ · ● smaller (a sample if more than 800).

Earthquakes

Largest

M-0.1

M3,0+

Depth range

5–5 km

Earthquakes over time

Cumulative count · 1 earthquakes · total moment ≈ M-0.1 · count moment

Depth (0 km at top). Grey: fixed depth.

Not enough depth data.

Magnitude distribution

Earthquakes

Largest

M-0.1

M3,0+

Depth range

5–5 km

Earthquakes over time

Cumulative count · 1 earthquakes · total moment ≈ M-0.1 · count moment

Depth (0 km at top). Grey: fixed depth.

Not enough depth data.

Magnitude distribution

Earthquakes

Largest

M1.4

M3,0+

Depth range

0–14 km

Earthquakes over time

Cumulative count · 28 earthquakes · total moment ≈ M1.6 · 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

Largest

M1.9

M3,0+

Depth range

0–14 km

Earthquakes over time

Cumulative count · 67 earthquakes · total moment ≈ M2.2 · 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.

Earthquakes

273

Largest

M1.9

M3,0+

Depth range

0–14 km

Earthquakes over time

Cumulative count · 273 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.

Earthquakes

494

Largest

M1.9

M3,0+

Depth range

0–18 km

Earthquakes over time

Cumulative count · 494 earthquakes · total moment ≈ M2.6 · 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.

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)	Mag	Depth	Area
2026-06-10 04:32	M-0.1	5.1	Önnur svæði
2026-06-07 23:41	M-0.1	14.0	Önnur svæði
2026-06-07 22:38	M0.2	5.0	Önnur svæði
2026-06-07 22:38	M0.4	5.2	Önnur svæði
2026-06-06 05:42	M0.4	0.0	Önnur svæði
2026-06-06 03:13	M0.5	4.0	Önnur svæði
2026-06-06 03:13	M0.6	3.7	Önnur svæði
2026-06-05 06:20	M0.7	6.2	Önnur svæði
2026-06-05 04:54	M0.9	3.4	Önnur svæði
2026-06-05 04:54	M0.7	1.9	Önnur svæði
2026-06-04 20:48	M0.0	9.2	Önnur svæði
2026-06-04 10:01	M-0.2	5.2	Önnur svæði
2026-06-04 09:31	M-0.5	4.2	Önnur svæði
2026-06-04 09:16	M0.0	5.2	Önnur svæði
2026-06-04 07:58	M-0.2	5.2	Önnur svæði
2026-06-04 06:03	M-0.4	2.4	Önnur svæði
2026-06-04 05:41	M0.4	5.2	Önnur svæði
2026-06-04 05:18	M-0.4	5.2	Önnur svæði
2026-06-04 04:58	M-0.7	5.2	Önnur svæði
2026-06-04 01:54	M-0.2	9.2	Önnur svæði
2026-06-04 01:37	M1.4	7.0	Önnur svæði
2026-06-04 00:11	M0.2	7.0	Önnur svæði
2026-06-03 23:22	M-0.7	5.2	Önnur svæði
2026-06-03 23:20	M-0.4	5.2	Önnur svæði
2026-06-03 23:11	M-0.4	5.2	Önnur svæði
2026-06-03 23:09	M0.7	5.2	Önnur svæði
2026-06-03 22:00	M0.4	3.2	Önnur svæði
2026-06-03 13:02	M-0.1	5.3	Önnur svæði
2026-06-03 08:11	M-0.7	5.2	Önnur svæði
2026-06-02 22:48	M0.0	2.4	Önnur svæði
2026-06-02 05:29	M0.3	0.0	Önnur svæði
2026-06-02 03:22	M-0.1	0.0	Önnur svæði
2026-06-01 23:13	M-0.1	5.2	Önnur svæði
2026-06-01 22:43	M-0.1	5.2	Önnur svæði
2026-06-01 17:03	M0.8	1.1	Önnur svæði
2026-06-01 17:01	M0.0	5.2	Önnur svæði
2026-06-01 16:31	M-2.7	5.2	Önnur svæði
2026-06-01 16:02	M0.6	4.1	Önnur svæði
2026-06-01 15:06	M0.5	5.2	Önnur svæði
2026-06-01 03:18	M1.1	5.7	Önnur svæði
2026-05-31 19:02	M0.3	9.1	Önnur svæði
2026-05-30 05:07	M0.8	4.4	Önnur svæði
2026-05-28 02:37	M0.6	6.7	Önnur svæði
2026-05-26 13:05	M0.6	7.5	Önnur svæði
2026-05-26 13:05	M0.6	7.1	Önnur svæði
2026-05-26 09:48	M-1.0	5.2	Önnur svæði
2026-05-26 00:16	M1.9	3.2	Önnur svæði
2026-05-24 22:02	M0.1	5.4	Önnur svæði
2026-05-24 06:46	M0.0	8.2	Önnur svæði
2026-05-24 06:44	M1.2	4.6	Önnur svæði
2026-05-23 00:02	M0.4	6.8	Önnur svæði
2026-05-21 22:41	M0.1	1.7	Önnur svæði
2026-05-20 20:44	M0.0	7.7	Önnur svæði
2026-05-17 11:05	M0.5	5.9	Önnur svæði
2026-05-17 05:05	M0.7	6.3	Önnur svæði
2026-05-16 23:30	M0.1	3.4	Önnur svæði
2026-05-16 21:56	M0.2	7.3	Önnur svæði
2026-05-16 21:31	M0.3	7.4	Önnur svæði
2026-05-16 21:30	M1.9	1.9	Önnur svæði
2026-05-16 20:43	M1.1	6.5	Önnur svæði

System journal

Automatic snapshots and media coverage, in chronological order. Subscribe: RSS · ntfy skjalftar-hromundartindur

Repeated × 2 since 2026-06-06 03:15:08 — last 2026-06-06 05:50:07

In the last 24 hours, four earthquakes were recorded in the Hrómundartindur system, indicating slightly higher activity than usual for this area with the increase consisting mostly of short-lived swarms. Activity is similar to the past week, while the largest earthquake in the last 48 hours was magnitude M0.9 and the cumulative moment for the period is Mw 1.2. These are automatic preliminary results and the activity most resembles the period around February 20, 2026; further details are available below.

2026-06-04 08:05:13 UTC

In the last 24 hours, 15 earthquakes were recorded in the Hrómundartindur system, indicating slightly higher activity than usual for this area and an increase from previous days. The increase is mostly due to short-lived swarms rather than distributed background activity, with the largest event at M1.4 and a cumulative magnitude of Mw 1.5 over the past 48 hours. These automatic preliminary results most closely resemble the period around February 20, 2026, in terms of event count. Further charts and maps are available below.

2026-06-04 05:00:15 UTC

In the last 24 hours, 11 earthquakes were recorded in the Hrómundartindur system, indicating slightly higher activity than usual for this area and an increase from previous days. The increase is mostly due to short-lived swarms rather than distributed background activity, with the largest event at M1.4 and a cumulative magnitude of Mw 1.5 over the past 48 hours. These automatic preliminary results most closely resemble the period around February 20, 2026, and further details on trends are available below.

2026-06-04 01:40:10 UTC

In the last 24 hours, nine earthquakes were recorded in the Hrómundartindur system, a small volcanic system east of Hengill, where activity is increasing but remains normal for this area. The increase is mainly due to short-lived swarms rather than distributed background activity and most closely resembles the period around February 20, 2026. The largest earthquake in the last 48 hours was M1.4 with a cumulative magnitude of Mw 1.5, though these figures are automatic preliminary results. Further details on trends and maps can be found lower on the page.

2026-06-02 16:05:15 UTC

In the last 24 hours, 13 earthquakes were recorded in the Hrómundartindur system, indicating slightly higher activity than usual for this area and marking an increase from previous days. The increase is mostly due to short-lived swarms rather than distributed background activity, with the largest earthquake in the last 48 hours being magnitude M1.1 and a cumulative moment of Mw 1.3. These automatic preliminary results most closely resemble the period around May 28, 2025, while further data on trends and land uplift are available below.

2026-06-02 09:30:19 UTC

In the last 24 hours, 14 earthquakes were recorded in the Hrómundartindur system, a small volcanic system east of Hengill, where activity is now increasing and slightly higher than usual for this area. The increase is mostly due to short-lived swarms rather than distributed background activity, with a b-value of 3.9 and a cumulative magnitude of Mw 1.3 over the past 48 hours. This automatic preliminary result most closely resembles the period around May 28, 2025, in terms of event count. Further charts and maps are available below.

2026-06-02 05:30:13 UTC

In the last 24 hours, 13 earthquakes were recorded in the Hrómundartindur system, indicating slightly higher activity than usual for this area and an increase from previous days. The increase is mostly due to short-lived swarms rather than distributed background activity, with the largest event at M1.1 and a cumulative magnitude of Mw 1.3. These automatic preliminary results most closely resemble the period around January 20, 2025, and further data on trends and land uplift are available below.

2026-06-02 03:25:10 UTC

In the last 24 hours, 10 earthquakes were recorded in the Hrómundartindur system, indicating slightly higher activity than usual for this area with the increase consisting mostly of short-lived swarms. Activity is increasing compared to the weekly average and resembles the period around January 20, 2025, while the largest earthquake in the last 48 hours was M1.1 with a cumulative magnitude of Mw 1.3. These figures are automatic preliminary results, and further details on trends can be found lower on the page.

2026-06-01 21:40:14 UTC

In the last 24 hours, nine earthquakes were recorded in the Hrómundartindur system, indicating higher than usual activity for this area and an increase from previous days. The increase is primarily due to short-lived swarms rather than distributed background activity, with the largest event at M1.1 and a cumulative magnitude of Mw 1.3 over the past 48 hours. These automatic preliminary results most closely resemble the period around February 19, 2026, and further details on trends are available below.

2026-06-01 19:05:13 UTC

In the last 24 hours, eight earthquakes were recorded in the Hrómundartindur system, indicating slightly higher activity than usual for this area with an increase consisting mostly of short-lived swarms. The largest earthquake was magnitude M1.1 and the cumulative moment over the past 48 hours was Mw 1.3, with current conditions resembling the period around February 21, 2026. These figures are automatic preliminary results, and further details can be found below on the page.

2026-06-01 16:08:31 UTC

In the last 24 hours, five earthquakes were recorded in the Hrómundartindur system, a small volcanic system east of Hengill, where activity is now increasing and slightly higher than usual for this area. The increase is mostly due to short-lived swarms rather than distributed background activity, with the largest earthquake at M1.1 and a cumulative magnitude of Mw 1.2. These automatic preliminary results most closely resemble the period around February 18, 2026, and further details on trends 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).