Early-est:     Off East Coast of Honshu, Japan    2025.11.09-08:11:28.03    q:B      mb:5.3    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: 5.3 [65]    Mwp: - [0]    Mwpd: - [0] Region: Off East Coast of Honshu, Japan Origin Time: 2025.11.09-08:11:28.03 UTC Hypocenter: lat: 39.61°  lon: 143.43°  [+/-17km]    depth: 10km  [+/-14km] Location Quality: qualityCode:  B     stdErr: 0.9s   assocPhases: 83   usedPhases: 70 minDist: 5.1°   maxDist: 160.2°   AzGap: 63°   2ndAzGap: 111°   atten: -1.08 [+/-0.20] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 17km   azMaxHorUnc: 127° 68%ConfEllipsoid:   semiMajorAxisLength: 21km   majorAxisAzimuth: 307°   majorAxisPlunge: 10°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 38°   intermediateAxisPlunge: 3°   semiMinorAxisLength: 14km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.5 [38]    Td: 30.0Xs [1]    Td*T50Ex: - [0]    To: 8.3s [25] Closest plate boundaries:    Pacific \ Okhotsk [subduction zone]: distance: ~70km    Okhotsk / Pacific [subduction zone]: distance: ~160km Subduction geometry:    Zone: Kamchatka/Kurils/Japan    Slab depth at epicenter: 15km 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:        15km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY): Nodal Plane 1: strike: 47°   dip: 7°   rake: -132° Nodal Plane 2: strike: 269°   dip: 85°   rake: -85° Quality: azimuthalGap: -1°   stationPolarityCount: 65   misfitWeightCount: 8.7   misfit: 0.08   stationDistributionRatio: 0.68   meanDistP: 25.2   meanDistT: 19.0   qualityCode: B 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: 222°   dip: 2°   rake: 49° Nodal Plane 2: strike: 82°   dip: 88°   rake: 92° Quality: azimuthalGap: 111°   stationPolarityCount: 65   misfit: 0.21   stationDistributionRatio: 0.62   rmsAngDiffAccPref: 33.99   fracAcc30degPref: 0.56   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/1762675887937
Event info last updated: 2025.11.09-09:13:12 UTC
Event first association/location: 2025.11.09-08:23:40 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI