Early-est:     Off East Coast of Honshu, Japan    2025.11.09-09:10:48.77    q:A      mb:5.2    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: 5.2 [125]    Mwp: 6.9X [3]    Mwpd: 6.7Xinv [3] Region: Off East Coast of Honshu, Japan Origin Time: 2025.11.09-09:10:48.77 UTC Hypocenter: lat: 39.39°  lon: 143.46°  [+/-9km]    depth: 10km  [+/-7km] Location Quality: qualityCode:  A     stdErr: 1.1s   assocPhases: 166   usedPhases: 142 minDist: 2.3°   maxDist: 154.1°   AzGap: 40°   2ndAzGap: 47°   atten: -1.12 [+/-0.10] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 7km   maxHorUnc: 9km   azMaxHorUnc: 154° 68%ConfEllipsoid:   semiMajorAxisLength: 11km   majorAxisAzimuth: 335°   majorAxisPlunge: 6°   semiIntermediateAxisLength: 8km   intermediateAxisAzimuth: 68°   intermediateAxisPlunge: 22°   semiMinorAxisLength: 7km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.5 [101]    Td: 20.8Xs [1]    Td*T50Ex: - [0]    To: 15.3s [86] Closest plate boundaries:    Pacific \ Okhotsk [subduction zone]: distance: ~60km    Okhotsk / Pacific [subduction zone]: distance: ~180km 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:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        10km        10km        10km Slab depth at epicenter:        14km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 101°   dip: 43°   rake: -83° Nodal Plane 2: strike: 272°   dip: 48°   rake: -96° Quality: azimuthalGap: -1°   stationPolarityCount: 129   misfitWeightCount: 14.9   misfit: 0.25   stationDistributionRatio: 0.29   meanDistP: 43.0   meanDistT: 39.9   qualityCode: D 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: 213°   dip: 63°   rake: 180° Nodal Plane 2: strike: 304°   dip: 90°   rake: 27° Quality: azimuthalGap: 39°   stationPolarityCount: 129   misfit: 0.44   stationDistributionRatio: 0.64   rmsAngDiffAccPref: 41.97   fracAcc30degPref: 0.63   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/1762679447115
Event info last updated: 2025.11.09-10:11:51 UTC
Event first association/location: 2025.11.09-09:17:36 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI