Western Volcanic Zone
Zone — systems within: Grímsnes · Prestahnúkur · Hveravellir
Points = earthquake locations in the selected window, coloured by magnitude: ● M3+ · ● M2+ · ● smaller (a sample if more than 800).
Earthquakes
11
Largest
M1.7
M3,0+
0
Depth range
1–16 km
Earthquakes over time
Cumulative count · 11 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.
Earthquakes
26
Largest
M1.7
M3,0+
0
Depth range
0–25 km
Earthquakes over time
Cumulative count · 26 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
530
Largest
M3.9
M3,0+
4
Depth range
0–28 km
Earthquakes over time
Cumulative count · 530 earthquakes · total moment ≈ M4.1 · count moment
No significant hypocenter migration — activity is stationary (R²=0.00, n=530); no sign of a propagating dike. Migration shows automatically if R²≥0.30.
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.
Gutenberg-Richter b ≈ 1.24 ± 0.19 (i.e. likely 1.05–1.42, M≥1.7, n=74)
Earthquakes
816
Largest
M3.9
M3,0+
5
Depth range
0–28 km
Earthquakes over time
Cumulative count · 816 earthquakes · total moment ≈ M4.1 · 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.
Gutenberg-Richter b ≈ 1.41 ± 0.19 (i.e. likely 1.23–1.60, M≥1.7, n=103)
Earthquakes
1270
Largest
M3.9
M3,0+
5
Depth range
0–28 km
Earthquakes over time
Cumulative count · 1270 earthquakes · total moment ≈ M4.1 · 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.
Gutenberg-Richter b ≈ 1.48 ± 0.17 (i.e. likely 1.31–1.65, M≥1.7, n=126)
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
1717
Largest
M3.9
M3,0+
5
Depth range
0–28 km
Earthquakes over time
Cumulative count · 1717 earthquakes · total moment ≈ M4.1 · 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.
Gutenberg-Richter b ≈ 1.49 ± 0.16 (i.e. likely 1.33–1.65, M≥1.7, n=138)
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.
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).