Early-est:     Off East Coast of Honshu, Japan    2025.11.09-15:44:23.80    q:B      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 [46]    Mwp: - [0]    Mwpd: - [0] Region: Off East Coast of Honshu, Japan Origin Time: 2025.11.09-15:44:23.80 UTC Hypocenter: lat: 39.47°  lon: 143.46°  [+/-18km]    depth: 10km  [+/-14km] Location Quality: qualityCode:  B     stdErr: 1.2s   assocPhases: 96   usedPhases: 57 minDist: 2.3°   maxDist: 150.1°   AzGap: 113°   2ndAzGap: 146°   atten: -0.92 [+/-0.21] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 18km   azMaxHorUnc: 98° 68%ConfEllipsoid:   semiMajorAxisLength: 22km   majorAxisAzimuth: 278°   majorAxisPlunge: 13°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 187°   intermediateAxisPlunge: 3°   semiMinorAxisLength: 14km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.5 [38]    Td: 0.9Xs [2]    Td*T50Ex: - [0]    To: 16.2s [29] 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:    -    -    - 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: 84°   dip: 21°   rake: -3° Nodal Plane 2: strike: 176°   dip: 89°   rake: -111° Quality: azimuthalGap: -1°   stationPolarityCount: 51   misfitWeightCount: 7.0   misfit: 0.16   stationDistributionRatio: 0.50   meanDistP: 39.4   meanDistT: 38.7   qualityCode: D 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: 349°   dip: 39°   rake: -152° Nodal Plane 2: strike: 237°   dip: 73°   rake: -54° Quality: azimuthalGap: 122°   stationPolarityCount: 51   misfit: 0.23   stationDistributionRatio: 0.60   rmsAngDiffAccPref: 34.30   fracAcc30degPref: 0.72   qualityCode: C 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/1762703063538
Event info last updated: 2025.11.09-16:44:12 UTC
Event first association/location: 2025.11.09-15:50:49 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI