Early-est:     Off East Coast of Honshu, Japan    2025.11.08-22:33:47.72    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 [59]    Mwp: 6.9X [3]    Mwpd: 7.1Xinv [3] Region: Off East Coast of Honshu, Japan Origin Time: 2025.11.08-22:33:47.72 UTC Hypocenter: lat: 39.35°  lon: 143.59°  [+/-13km]    depth: 10km  [+/-12km] Location Quality: qualityCode:  A     stdErr: 1.2s   assocPhases: 89   usedPhases: 71 minDist: 2.4°   maxDist: 160.1°   AzGap: 80°   2ndAzGap: 119°   atten: -1.01 [+/-0.14] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 13km   azMaxHorUnc: 146° 68%ConfEllipsoid:   semiMajorAxisLength: 16km   majorAxisAzimuth: 324°   majorAxisPlunge: 2°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 233°   intermediateAxisPlunge: 22°   semiMinorAxisLength: 12km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.6 [39]    Td: -s [0]    Td*T50Ex: - [0]    To: 27.4s [31] Closest plate boundaries:    Pacific \ Okhotsk [subduction zone]: distance: ~50km    Okhotsk / Pacific [subduction zone]: distance: ~180km Subduction geometry:    Zone: Kamchatka/Kurils/Japan    Slab depth at epicenter: 12km 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:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        10km        10km        10km Slab depth at epicenter:        12km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 174°   dip: 31°   rake: 74° Nodal Plane 2: strike: 12°   dip: 60°   rake: 99° Quality: azimuthalGap: -1°   stationPolarityCount: 59   misfitWeightCount: 9.2   misfit: 0.23   stationDistributionRatio: 0.67   meanDistP: 38.4   meanDistT: 23.3   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: 238°   dip: 52°   rake: -165° Nodal Plane 2: strike: 139°   dip: 78°   rake: -39° Quality: azimuthalGap: 119°   stationPolarityCount: 59   misfit: 0.44   stationDistributionRatio: 0.63   rmsAngDiffAccPref: 47.42   fracAcc30degPref: 0.47   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/1762641229838
Event info last updated: 2025.11.08-23:34:08 UTC
Event first association/location: 2025.11.08-22:42:48 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI