Early-est:     Off East Coast of Honshu, Japan    2025.11.09-08:34:03.40    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 [94]    Mwp: 7.1X [1]    Mwpd: - [0] Region: Off East Coast of Honshu, Japan Origin Time: 2025.11.09-08:34:03.40 UTC Hypocenter: lat: 39.40°  lon: 143.53°  [+/-7km]    depth: 10km  [+/-6km] Location Quality: qualityCode:  A     stdErr: 1.1s   assocPhases: 134   usedPhases: 105 minDist: 2.3°   maxDist: 146.4°   AzGap: 97°   2ndAzGap: 102°   atten: -1.34 [+/-0.09] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 6km   maxHorUnc: 7km   azMaxHorUnc: 141° 68%ConfEllipsoid:   semiMajorAxisLength: 8km   majorAxisAzimuth: 142°   majorAxisPlunge: 6°   semiIntermediateAxisLength: 7km   intermediateAxisAzimuth: 232°   intermediateAxisPlunge: 6°   semiMinorAxisLength: 6km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.8 [76]    Td: -s [0]    Td*T50Ex: - [0]    To: 60.3s [61] 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: 13km 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:        13km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 80°   dip: 4°   rake: -99° Nodal Plane 2: strike: 269°   dip: 86°   rake: -89° Quality: azimuthalGap: -1°   stationPolarityCount: 93   misfitWeightCount: 14.8   misfit: 0.27   stationDistributionRatio: 0.38   meanDistP: 38.2   meanDistT: 32.6   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: 94°   dip: 87°   rake: 136° Nodal Plane 2: strike: 187°   dip: 46°   rake: 4° Quality: azimuthalGap: 97°   stationPolarityCount: 93   misfit: 0.36   stationDistributionRatio: 0.64   rmsAngDiffAccPref: 43.01   fracAcc30degPref: 0.49   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/1762677241724
Event info last updated: 2025.11.09-09:35:13 UTC
Event first association/location: 2025.11.09-08:38:59 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI