Early-est:     North of Svalbard    2026.09.28-13:22:40.94    q:B      mb:4.8    Mwp:5.6*    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1790601762327.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1790601762327.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1790601762327.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: 4.8 [17]    Mwp: 5.6* [4]    Mwpd: 5.4Xinv [1]
Region: North of Svalbard
Origin Time: 2026.09.28-13:22:40.94 UTC
Hypocenter: lat: 82.43°  lon: -8.29°  [+/-19km]    depth: 9km  [+/-13km]
Location Quality: qualityCode:  B     stdErr: 2.5s   assocPhases: 43   usedPhases: 16
minDist: 4.8°   maxDist: 53.6°   AzGap: 88°   2ndAzGap: 112°   atten: -1.63 [+/-0.34]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 19km   azMaxHorUnc: 171°
68%ConfEllipsoid:   semiMajorAxisLength: 24km   majorAxisAzimuth: 170°   majorAxisPlunge: 10°   semiIntermediateAxisLength: 13km   intermediateAxisAzimuth: 73°   intermediateAxisPlunge: 36°   semiMinorAxisLength: 12km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [11]    Td: 3.3Xs [3]    Td*T50Ex: - [0]    To: 13.5s [11]
Closest plate boundaries:
   North America - Eurasia [oceanic transform fault]: distance: ~50km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 no
 no
 YES (50km)
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       5.6*
       5.6*
       5.6*
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.1790601762327.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 138°   dip: 16°   rake: 127°
Nodal Plane 2: strike: 279°   dip: 77°   rake: 80°
Quality: azimuthalGap: -1°   stationPolarityCount: 16   misfitWeightCount: 4.7   misfit: 0.10   stationDistributionRatio: 0.34   meanDistP: 46.7   meanDistT: 53.2   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1790601762327.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.1790601762327.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 164°   dip: 60°   rake: -174°
Nodal Plane 2: strike: 70°   dip: 85°   rake: -30°
Quality: azimuthalGap: 87°   stationPolarityCount: 16   misfit: 0.22   stationDistributionRatio: 0.52   rmsAngDiffAccPref: 32.62   fracAcc30degPref: 0.75   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1790601762327.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1790601762327
Event info last updated: 2026.09.28-14:21:00 UTC
Event first association/location: 2026.09.28-13:30:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA