Early-est:     Norwegian Sea    2026.08.13-00:33:37.61    q:C      mb:4.5*    Mwp:-    Mwpd:-    Td*T50Ex:1.6     fmamp_polarity:./hypo.1786581217679.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1786581217679.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1786581217679.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: 4.5* [18]    Mwp: 5.1X [1]    Mwpd: 5.1Xinv [1]
Region: Norwegian Sea
Origin Time: 2026.08.13-00:33:37.61 UTC
Hypocenter: lat: 72.89°  lon: 9.45°  [+/-50km]    depth: 15km  [+/-34km]
Location Quality: qualityCode:  C     stdErr: 0.7s   assocPhases: 47   usedPhases: 13
minDist: 16.0°   maxDist: 144.8°   AzGap: 213°   2ndAzGap: 221°   atten: -1.44 [+/-1.53]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 38km   maxHorUnc: 50km   azMaxHorUnc: 21°
68%ConfEllipsoid:   semiMajorAxisLength: 63km   majorAxisAzimuth: 19°   majorAxisPlunge: 12°   semiIntermediateAxisLength: 47km   intermediateAxisAzimuth: 288°   intermediateAxisPlunge: 9°   semiMinorAxisLength: 32km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.6 [9]    Td: 2.9s [6]    Td*T50Ex: 1.6 [6]    To: 10.0s [7]
Closest plate boundaries:
   North America - Eurasia [oceanic spreading ridge]: distance: ~70km
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:
   1.6
   1.6
   1.6
Td*To:
     29.0
     29.0
     29.0
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       15km
       15km
       15km
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.1786581217679.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 49°   dip: 30°   rake: 95°
Nodal Plane 2: strike: 223°   dip: 61°   rake: 87°
Quality: azimuthalGap: -1°   stationPolarityCount: 13   misfitWeightCount: 3.7   misfit: 0.00   stationDistributionRatio: 0.36   meanDistP: 50.4   meanDistT: 43.6   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1786581217679.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.1786581217679.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (No solution available)
Nodal Plane 1: strike: 999°   dip: 99°   rake: 999°
Nodal Plane 2: strike: 324°   dip: 13°   rake: 135°
Quality: azimuthalGap: 213°   stationPolarityCount: 13   misfit: 0.99   stationDistributionRatio: 0.68   rmsAngDiffAccPref: 40.63   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1786581217679.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1786581217679
Event info last updated: 2026.08.13-01:32:00 UTC
Event first association/location: 2026.08.13-00:43:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA