Early-est:     Off East Coast of Honshu, Japan    2025.11.10-07:22:16.62    q:A      mb:5.1    Mwp:5.7    Mwpd:-    Td*T50Ex:1.3     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: 5.1 [71]    Mwp: 5.7 [14]    Mwpd: 5.9Xinv [9] Region: Off East Coast of Honshu, Japan Origin Time: 2025.11.10-07:22:16.62 UTC Hypocenter: lat: 39.55°  lon: 143.60°  [+/-7km]    depth: 10km  [+/-6km] Location Quality: qualityCode:  A     stdErr: 1.2s   assocPhases: 101   usedPhases: 87 minDist: 2.3°   maxDist: 143.9°   AzGap: 94°   2ndAzGap: 98°   atten: -1.14 [+/-0.13] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 6km   maxHorUnc: 7km   azMaxHorUnc: 93° 68%ConfEllipsoid:   semiMajorAxisLength: 8km   majorAxisAzimuth: 274°   majorAxisPlunge: 10°   semiIntermediateAxisLength: 8km   intermediateAxisAzimuth: 5°   intermediateAxisPlunge: 2°   semiMinorAxisLength: 6km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.5 [62]    Td: 2.6s [8]    Td*T50Ex: 1.3 [8]    To: 13.1s [51] Closest plate boundaries:    Pacific \ Okhotsk [subduction zone]: distance: ~50km    Okhotsk / Pacific [subduction zone]: distance: ~160km Subduction geometry:    Zone: Kamchatka/Kurils/Japan    Slab depth at epicenter: 13km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (50km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    1.3    1.3    1.3 Td*To:      34.1      34.1      34.1 Mwp magnitude:        5.7        5.7        5.7 Hypocenter depth:        10km        10km        10km Slab depth at epicenter:        13km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 6°   dip: 39°   rake: 159° Nodal Plane 2: strike: 113°   dip: 77°   rake: 53° Quality: azimuthalGap: -1°   stationPolarityCount: 79   misfitWeightCount: 14.4   misfit: 0.20   stationDistributionRatio: 0.39   meanDistP: 39.1   meanDistT: 23.1   qualityCode: C Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 203°   dip: 75°   rake: -155° Nodal Plane 2: strike: 106°   dip: 66°   rake: -17° Quality: azimuthalGap: 70°   stationPolarityCount: 79   misfit: 0.28   stationDistributionRatio: 0.64   rmsAngDiffAccPref: 41.41   fracAcc30degPref: 0.60   qualityCode: D Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
First-motion Focal Mechanism (FMAMP_AMP_AREF):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 149°   dip: 33°   rake: 18° Nodal Plane 2: strike: 44°   dip: 80°   rake: 121° Quality: azimuthalGap: -1°   stationPolarityCount: 14   misfitWeightCount: 3.8   misfit: 9999.90   stationDistributionRatio: 0.34   meanDistP: 42.1   meanDistT: 32.1   qualityCode: D Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_amp_aref
First-motion Focal Mechanism (FMAMP_AMP_MWP):    (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/_amp_mwp

Event ID: smi:KOERI/ee/event/1762759337747
Event info last updated: 2025.11.10-08:23:16 UTC
Event first association/location: 2025.11.10-07:28:32 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI