Northern Volcanic Zone
Zone — systems within: Askja · Kverkfjöll · Herðubreið · Krafla · Fremrinámur · Þeistareykir
Points = earthquake locations in the selected window, coloured by magnitude: M3+ · M2+ · smaller (a sample if more than 800).
Earthquakes
6
Largest
M0.5
M3,0+
0
Depth range
0–5 km
Earthquakes over time
Cumulative count · 6 earthquakes · total moment ≈ M0.7 · 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.
Earthquakes
20
Largest
M1.1
M3,0+
0
Depth range
0–8 km
Earthquakes over time
Cumulative count · 20 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
49
Largest
M1.3
M3,0+
0
Depth range
0–12 km
Earthquakes over time
Cumulative count · 49 earthquakes · total moment ≈ M1.7 · count moment
No significant hypocenter migration — activity is stationary (R²=0.12, n=49); 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.
Earthquakes
201
Largest
M3.5
M3,0+
2
Depth range
0–19 km
Earthquakes over time
Cumulative count · 201 earthquakes · total moment ≈ M3.6 · 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
1889
Largest
M3.5
M3,0+
2
Depth range
0–27 km
Earthquakes over time
Cumulative count · 1889 earthquakes · total moment ≈ M3.6 · 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.
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
4433
Largest
M3.5
M3,0+
3
Depth range
0–27 km
Earthquakes over time
Cumulative count · 4433 earthquakes · total moment ≈ M3.7 · 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.
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.