Early-est:     East of Kuril Islands    2026.02.11-16:35:11.17    q:B      mb:4.9*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1770827707856.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1770827707856.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1770827707856.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: 4.9* [40]    Mwp: - [0]    Mwpd: - [0]
Region: East of Kuril Islands
Origin Time: 2026.02.11-16:35:11.17 UTC
Hypocenter: lat: 44.57°  lon: 151.73°  [+/-40km]    depth: 15km  [+/-26km]
Location Quality: qualityCode:  B     stdErr: 2.0s   assocPhases: 70   usedPhases: 46
minDist: 6.7°   maxDist: 151.8°   AzGap: 91°   2ndAzGap: 150°   atten: -1.20 [+/-0.27]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 24km   maxHorUnc: 40km   azMaxHorUnc: 1°
68%ConfEllipsoid:   semiMajorAxisLength: 50km   majorAxisAzimuth: 181°   majorAxisPlunge: 7°   semiIntermediateAxisLength: 31km   intermediateAxisAzimuth: 275°   intermediateAxisPlunge: 26°   semiMinorAxisLength: 24km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [24]    Td: 0.7Xs [1]    Td*T50Ex: - [0]    To: 12.5s [21]
Closest plate boundaries:
   Okhotsk / Pacific [subduction zone]: distance: ~30km
   Pacific \ Okhotsk [subduction zone]: distance: ~720km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (30km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
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.1770827707856.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 191°   dip: 21°   rake: 80°
Nodal Plane 2: strike: 22°   dip: 69°   rake: 94°
Quality: azimuthalGap: -1°   stationPolarityCount: 44   misfitWeightCount: 5.4   misfit: 0.13   stationDistributionRatio: 0.58   meanDistP: 50.7   meanDistT: 41.5   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1770827707856.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.1770827707856.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 39°   dip: 36°   rake: 34°
Nodal Plane 2: strike: 280°   dip: 71°   rake: 121°
Quality: azimuthalGap: 150°   stationPolarityCount: 44   misfit: 0.25   stationDistributionRatio: 0.66   rmsAngDiffAccPref: 32.79   fracAcc30degPref: 0.57   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1770827707856.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1770827707856
Event info last updated: 2026.02.11-17:34:00 UTC
Event first association/location: 2026.02.11-16:43:02 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA