Early-est:     Off East Coast of Honshu, Japan    2025.11.08-22:27:01.83    q:A      mb:5.0    Mwp:-    Mwpd:-    Td*T50Ex:-     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: 5.0 [70]    Mwp: - [0]    Mwpd: - [0] Region: Off East Coast of Honshu, Japan Origin Time: 2025.11.08-22:27:01.83 UTC Hypocenter: lat: 39.34°  lon: 143.45°  [+/-15km]    depth: 10km  [+/-14km] Location Quality: qualityCode:  A     stdErr: 1.0s   assocPhases: 109   usedPhases: 81 minDist: 2.3°   maxDist: 154.0°   AzGap: 44°   2ndAzGap: 77°   atten: -1.03 [+/-0.15] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 15km   azMaxHorUnc: 98° 68%ConfEllipsoid:   semiMajorAxisLength: 19km   majorAxisAzimuth: 101°   majorAxisPlunge: 13°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 203°   intermediateAxisPlunge: 43°   semiMinorAxisLength: 13km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.5 [57]    Td: 6.6Xs [1]    Td*T50Ex: - [0]    To: 15.7s [51] Closest plate boundaries:    Pacific \ Okhotsk [subduction zone]: distance: ~70km    Okhotsk / Pacific [subduction zone]: distance: ~190km 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 (70km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        10km        10km        10km Slab depth at epicenter:        14km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 151°   dip: 14°   rake: -132° Nodal Plane 2: strike: 14°   dip: 80°   rake: -80° Quality: azimuthalGap: -1°   stationPolarityCount: 73   misfitWeightCount: 10.0   misfit: 0.12   stationDistributionRatio: 0.70   meanDistP: 25.0   meanDistT: 36.7   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: 226°   dip: 11°   rake: -44° Nodal Plane 2: strike: 359°   dip: 82°   rake: -98° Quality: azimuthalGap: 101°   stationPolarityCount: 73   misfit: 0.24   stationDistributionRatio: 0.63   rmsAngDiffAccPref: 34.49   fracAcc30degPref: 0.54   qualityCode: D Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
First-motion Focal Mechanism (FMAMP_AMP_AREF):    (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_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/1762640823928
Event info last updated: 2025.11.08-23:27:48 UTC
Event first association/location: 2025.11.08-22:33:48 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI