Early-est:     Sea of Okhotsk    2026.02.11-06:29:54.36    q:B      mb:5.3    Mwp:5.7*    Mwpd:-    Td*T50Ex:1.6     fmamp_polarity:./hypo.1770791393627.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1770791393627.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1770791393627.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: 5.3 [80]    Mwp: 5.7* [22]    Mwpd: 6.0Xinv [23]
Region: Sea of Okhotsk
Origin Time: 2026.02.11-06:29:54.36 UTC
Hypocenter: lat: 57.65°  lon: 146.81°  [+/-29km]    depth: 15km  [+/-33km]
Location Quality: qualityCode:  B     stdErr: 2.5s   assocPhases: 146   usedPhases: 93
minDist: 2.8°   maxDist: 150.9°   AzGap: 63°   2ndAzGap: 112°   atten: -1.26 [+/-0.19]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 27km   maxHorUnc: 29km   azMaxHorUnc: 153°
68%ConfEllipsoid:   semiMajorAxisLength: 36km   majorAxisAzimuth: 155°   majorAxisPlunge: 9°   semiIntermediateAxisLength: 34km   intermediateAxisAzimuth: 249°   intermediateAxisPlunge: 22°   semiMinorAxisLength: 33km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.6 [79]    Td: 2.5s [18]    Td*T50Ex: 1.6 [18]    To: 38.6s [76]
Closest plate boundaries:
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:
     96.5
     96.5
     96.5
Mwp magnitude:
       5.7*
       5.7*
       5.7*
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.1770791393627.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 0°   dip: 70°   rake: 173°
Nodal Plane 2: strike: 93°   dip: 84°   rake: 20°
Quality: azimuthalGap: -1°   stationPolarityCount: 83   misfitWeightCount: 15.4   misfit: 0.21   stationDistributionRatio: 0.57   meanDistP: 42.9   meanDistT: 44.3   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1770791393627.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 5°   dip: 71°   rake: 176°
Nodal Plane 2: strike: 96°   dip: 86°   rake: 19°
Quality: azimuthalGap: -1°   stationPolarityCount: 10   misfitWeightCount: 3.4   misfit: 0.00   stationDistributionRatio: 0.53   meanDistP: 54.1   meanDistT: 48.7   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity_waveform
./hypo.1770791393627.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 353°   dip: 78°   rake: -173°
Nodal Plane 2: strike: 262°   dip: 83°   rake: -12°
Quality: azimuthalGap: 62°   stationPolarityCount: 83   misfit: 0.37   stationDistributionRatio: 0.72   rmsAngDiffAccPref: 17.11   fracAcc30degPref: 1.00   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1770791393627.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1770791393627
Event info last updated: 2026.02.11-07:28:01 UTC
Event first association/location: 2026.02.11-06:35:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA