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
1
Largest
M0.4
M3,0+
0
Depth range
16–16 km
Earthquakes over time
Cumulative count · 1 earthquakes · total moment ≈ M0.4 · count moment
Depth (0 km at top).
Not enough depth data.
Magnitude distribution
Earthquakes
3
Largest
M1.1
M3,0+
0
Depth range
1–16 km
Earthquakes over time
Cumulative count · 3 earthquakes · total moment ≈ M1.3 · count moment
Depth (0 km at top).
Magnitude distribution
Depth cross-sections — color by age (orange=newest, grey=older), point size by M. Rising cluster = possible magma intrusion.
Earthquakes
18
Largest
M1.8
M3,0+
0
Depth range
0–16 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
213
Largest
M4.7
M3,0+
2
Depth range
0–26 km
Earthquakes over time
Cumulative count · 213 earthquakes · total moment ≈ M4.7 · 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
2067
Largest
M4.7
M3,0+
8
Depth range
0–28 km
Earthquakes over time
Cumulative count · 2067 earthquakes · total moment ≈ M4.7 · 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.
Gutenberg-Richter b ≈ 1.42 ± 0.12 (i.e. likely 1.30–1.54, M≥1.7, n=241)
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
2473
Largest
M4.7
M3,0+
8
Depth range
0–28 km
Earthquakes over time
Cumulative count · 2473 earthquakes · total moment ≈ M4.7 · 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.
Gutenberg-Richter b ≈ 1.43 ± 0.11 (i.e. likely 1.31–1.54, M≥1.7, n=252)
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.