Snæfellsnes Volcanic Belt
Zone — systems within: Snæfellsjökull · Helgrindur · Ljósufjöll
Points = earthquake locations in the selected window, coloured by magnitude: M3+ · M2+ · smaller (a sample if more than 800).
Earthquakes
6
Largest
M1.1
M3,0+
0
Depth range
1–20 km
Earthquakes over time
Cumulative count · 6 earthquakes · total moment ≈ M1.3 · 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
9
Largest
M1.4
M3,0+
0
Depth range
0–20 km
Earthquakes over time
Cumulative count · 9 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
31
Largest
M1.5
M3,0+
0
Depth range
0–21 km
Earthquakes over time
Cumulative count · 31 earthquakes · total moment ≈ M1.8 · count moment
No significant hypocenter migration — activity is stationary (R²=0.02, n=31); no sign of a propagating dike. Migration shows automatically if R²≥0.30.
Depth (0 km at top) — shallowing in the data (13.9→8.3 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.
Earthquakes
150
Largest
M2.5
M3,0+
0
Depth range
0–24 km
Earthquakes over time
Cumulative count · 150 earthquakes · total moment ≈ M2.8 · 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.
Earthquakes
1940
Largest
M3.1
M3,0+
3
Depth range
0–24 km
Earthquakes over time
Cumulative count · 1940 earthquakes · total moment ≈ M3.7 · count moment
Depth (0 km at top) — shallowing in the data (12.8→7.7 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.
Gutenberg-Richter b ≈ 1.50 ± 0.14 (i.e. likely 1.37–1.64, M≥1.7, n=134)
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
4352
Largest
M3.6
M3,0+
7
Depth range
0–25 km
Earthquakes over time
Cumulative count · 4352 earthquakes · total moment ≈ M4.0 · 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.
Gutenberg-Richter b ≈ 1.48 ± 0.08 (i.e. likely 1.40–1.56, M≥1.7, n=373)
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.