South Iceland Seismic Zone
Zone — systems within: Suðurlandsbrotabelti
Points = earthquake locations in the selected window, coloured by magnitude: M3+ · M2+ · smaller (a sample if more than 800).
Earthquakes
11
Largest
M0.9
M3,0+
0
Depth range
0–8 km
Earthquakes over time
Cumulative count · 11 earthquakes · total moment ≈ M1.1 · 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
18
Largest
M2.0
M3,0+
0
Depth range
0–15 km
Earthquakes over time
Cumulative count · 18 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
58
Largest
M2.0
M3,0+
0
Depth range
0–15 km
Earthquakes over time
Cumulative count · 58 earthquakes · total moment ≈ M2.1 · count moment
No significant hypocenter migration — activity is stationary (R²=0.02, n=58); 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
214
Largest
M2.0
M3,0+
0
Depth range
0–17 km
Earthquakes over time
Cumulative count · 214 earthquakes · total moment ≈ M2.3 · 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
1794
Largest
M2.6
M3,0+
0
Depth range
0–35 km
Earthquakes over time
Cumulative count · 1794 earthquakes · total moment ≈ M3.3 · 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.
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
3484
Largest
M2.6
M3,0+
0
Depth range
0–35 km
Earthquakes over time
Cumulative count · 3484 earthquakes · total moment ≈ M3.4 · 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.