Early-est:     Svalbard Region    2026.08.17-19:51:24.48    q:C      mb:4.7*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1786996284649.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1786996284649.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1786996284649.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* [10]    Mwp: - [0]    Mwpd: - [0]
Region: Svalbard Region
Origin Time: 2026.08.17-19:51:24.48 UTC
Hypocenter: lat: 77.67°  lon: 6.86°  [+/-13km]    depth: 9km  [+/-14km]
Location Quality: qualityCode:  C     stdErr: 1.8s   assocPhases: 14   usedPhases: 9
minDist: 1.6°   maxDist: 71.0°   AzGap: 73°   2ndAzGap: 128°   atten: -1.48 [+/-0.22]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 13km   azMaxHorUnc: 13°
68%ConfEllipsoid:   semiMajorAxisLength: 16km   majorAxisAzimuth: 352°   majorAxisPlunge: 29°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 258°   intermediateAxisPlunge: 8°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [7]    Td: 2.8Xs [3]    Td*T50Ex: - [0]    To: 5.6s [7]
Closest plate boundaries:
   North America - Eurasia [oceanic spreading ridge]: distance: ~20km
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:
   -
   -
   -
Td*To:
     -
     -
     -
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.1786996284649.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 49°   dip: 13°   rake: -40°
Nodal Plane 2: strike: 178°   dip: 82°   rake: -100°
Quality: azimuthalGap: -1°   stationPolarityCount: 9   misfitWeightCount: 4.3   misfit: 0.13   stationDistributionRatio: 0.30   meanDistP: 48.1   meanDistT: 49.4   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1786996284649.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.1786996284649.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: 162°   stationPolarityCount: 7   misfit: 0.99   stationDistributionRatio: 0.00   rmsAngDiffAccPref: 0.00   fracAcc30degPref: 0.00   qualityCode: F
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1786996284649.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1786996284649
Event info last updated: 2026.08.17-20:50:00 UTC
Event first association/location: 2026.08.17-20:04:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA