Early-est:     Off East Coast of Honshu, Japan    2025.11.10-07:23:20.18    q:A      mb:5.4    Mwp:6.4    Mwpd:-    Td*T50Ex:3.3     fmamp_polarity:     hash:     fmamp_amp_aref:     fmamp_amp_mwp:

Automatic solution - this event has not been reviewed by a seismologist
Automatically determined event information may be incorrect!

Earthquake Details: Magnitude: mb: 5.4 [142]    Mwp: 6.4 [86]    Mwpd: 6.6Xinv [68] Region: Off East Coast of Honshu, Japan Origin Time: 2025.11.10-07:23:20.18 UTC Hypocenter: lat: 39.47°  lon: 143.50°  [+/-15km]    depth: 10km  [+/-14km] Location Quality: qualityCode:  A     stdErr: 1.2s   assocPhases: 248   usedPhases: 175 minDist: 5.1°   maxDist: 161.3°   AzGap: 30°   2ndAzGap: 43°   atten: -1.19 [+/-0.26] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 15km   azMaxHorUnc: 61° 68%ConfEllipsoid:   semiMajorAxisLength: 19km   majorAxisAzimuth: 63°   majorAxisPlunge: 14°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 153°   intermediateAxisPlunge: 3°   semiMinorAxisLength: 14km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.7 [84]    Td: 4.9s [12]    Td*T50Ex: 3.3 [12]    To: 37.4s [79] Closest plate boundaries:    Pacific \ Okhotsk [subduction zone]: distance: ~60km    Okhotsk / Pacific [subduction zone]: distance: ~170km Subduction geometry:    Zone: Kamchatka/Kurils/Japan    Slab depth at epicenter: 14km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (60km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    3.3    3.3    3.3 Td*To:      183.3      183.3      183.3 Mwp magnitude:        6.4        6.4        6.4 Hypocenter depth:        10km        10km        10km Slab depth at epicenter:        14km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY): Nodal Plane 1: strike: 186°   dip: 15°   rake: 58° Nodal Plane 2: strike: 39°   dip: 77°   rake: 98° Quality: azimuthalGap: -1°   stationPolarityCount: 166   misfitWeightCount: 17.9   misfit: 0.10   stationDistributionRatio: 0.51   meanDistP: 25.4   meanDistT: 20.1   qualityCode: B Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 157°   dip: 12°   rake: 39° Nodal Plane 2: strike: 28°   dip: 83°   rake: 99° Quality: azimuthalGap: 30°   stationPolarityCount: 166   misfit: 0.14   stationDistributionRatio: 0.61   rmsAngDiffAccPref: 30.25   fracAcc30degPref: 0.64   qualityCode: C Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
First-motion Focal Mechanism (FMAMP_AMP_AREF):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 137°   dip: 33°   rake: 7° Nodal Plane 2: strike: 41°   dip: 86°   rake: 123° Quality: azimuthalGap: -1°   stationPolarityCount: 91   misfitWeightCount: 9.6   misfit: 9999.90   stationDistributionRatio: 0.28   meanDistP: 27.7   meanDistT: 29.9   qualityCode: C Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_amp_aref
First-motion Focal Mechanism (FMAMP_AMP_MWP):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 136°   dip: 23°   rake: 22° Nodal Plane 2: strike: 26°   dip: 82°   rake: 111° Quality: azimuthalGap: -1°   stationPolarityCount: 74   misfitWeightCount: 7.6   misfit: 9999.90   stationDistributionRatio: 0.28   meanDistP: 29.8   meanDistT: 28.1   qualityCode: C Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_amp_mwp

Event ID: smi:KOERI/ee/event/1762759397602
Event info last updated: 2025.11.10-08:23:58 UTC
Event first association/location: 2025.11.10-07:32:58 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI