Early-est:     Iceland Region    2026.05.31-00:54:02.99    q:A      mb:4.7*    Mwp:-    Mwpd:-    Td*T50Ex:1.2     fmamp_polarity:./hypo.1780188843659.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1780188843659.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1780188843659.mech.hash.thumb.jpg

Automatic solution - this event has not been reviewed by a seismologist
Automatically determined event information may be incorrect!

Earthquake Details:
Magnitude: mb: 4.7* [54]    Mwp: - [0]    Mwpd: - [0]
Region: Iceland Region
Origin Time: 2026.05.31-00:54:02.99 UTC
Hypocenter: lat: 62.23°  lon: -26.29°  [+/-22km]    depth: 9km  [+/-27km]
Location Quality: qualityCode:  A     stdErr: 1.2s   assocPhases: 77   usedPhases: 57
minDist: 3.3°   maxDist: 152.3°   AzGap: 79°   2ndAzGap: 114°   atten: -1.17 [+/-0.30]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 18km   maxHorUnc: 22km   azMaxHorUnc: 20°
68%ConfEllipsoid:   semiMajorAxisLength: 33km   majorAxisAzimuth: 20°   majorAxisPlunge: 44°   semiIntermediateAxisLength: 23km   intermediateAxisAzimuth: 110°   intermediateAxisPlunge: 0°   semiMinorAxisLength: 18km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [40]    Td: 3.2s [4]    Td*T50Ex: 1.2 [4]    To: 2.9s [38]
Closest plate boundaries:
   Eurasia - North America [oceanic spreading ridge]: distance: ~10km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 no
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   1.2
   1.2
   1.2
Td*To:
     9.3
     9.3
     9.3
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       9km
       9km
       9km
Slab depth at epicenter:
       n/a
       -
       -
Tsunami and Rupture predictions (TEST!): No prediction: Event too small (Mwp<7.0) or too few Mwp readings (N<20)
./hypo.1780188843659.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 59°   dip: 43°   rake: -16°
Nodal Plane 2: strike: 161°   dip: 79°   rake: -132°
Quality: azimuthalGap: -1°   stationPolarityCount: 51   misfitWeightCount: 6.1   misfit: 0.14   stationDistributionRatio: 0.36   meanDistP: 51.0   meanDistT: 53.6   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1780188843659.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (No solution available)
Nodal Plane 1: strike: 0°   dip: 0°   rake: 0°
Nodal Plane 2: strike: 270°   dip: 90°   rake: 90°
Quality: azimuthalGap: -1°   stationPolarityCount: 0   misfitWeightCount: -1.0   misfit: -1.00   stationDistributionRatio: -1.00   meanDistP: -1.0   meanDistT: -1.0   qualityCode: X
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity_waveform
./hypo.1780188843659.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 255°   dip: 41°   rake: -120°
Nodal Plane 2: strike: 112°   dip: 56°   rake: -67°
Quality: azimuthalGap: 113°   stationPolarityCount: 51   misfit: 0.43   stationDistributionRatio: 0.49   rmsAngDiffAccPref: 43.69   fracAcc30degPref: 0.36   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1780188843659.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1780188843659
Event info last updated: 2026.05.31-01:53:00 UTC
Event first association/location: 2026.05.31-00:59:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA