Early-est:     Off East Coast of Honshu, Japan    2025.11.09-09:28:27.12    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 [116]    Mwp: 7.1X [1]    Mwpd: 7.3X [1] Region: Off East Coast of Honshu, Japan Origin Time: 2025.11.09-09:28:27.12 UTC Hypocenter: lat: 39.59°  lon: 143.43°  [+/-19km]    depth: 10km  [+/-13km] Location Quality: qualityCode:  A     stdErr: 1.2s   assocPhases: 158   usedPhases: 131 minDist: 2.2°   maxDist: 144.0°   AzGap: 94°   2ndAzGap: 98°   atten: -0.88 [+/-0.26] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 19km   azMaxHorUnc: 136° 68%ConfEllipsoid:   semiMajorAxisLength: 24km   majorAxisAzimuth: 315°   majorAxisPlunge: 8°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 225°   intermediateAxisPlunge: 3°   semiMinorAxisLength: 13km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.7 [107]    Td: -s [0]    Td*T50Ex: - [0]    To: 45.7s [98] 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):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 42°   dip: 41°   rake: -54° Nodal Plane 2: strike: 178°   dip: 58°   rake: -117° Quality: azimuthalGap: -1°   stationPolarityCount: 110   misfitWeightCount: 9.0   misfit: 0.22   stationDistributionRatio: 0.42   meanDistP: 42.6   meanDistT: 47.2   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: 152°   dip: 53°   rake: -98° Nodal Plane 2: strike: 346°   dip: 38°   rake: -79° Quality: azimuthalGap: 94°   stationPolarityCount: 110   misfit: 0.37   stationDistributionRatio: 0.65   rmsAngDiffAccPref: 40.15   fracAcc30degPref: 0.41   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/1762680508037
Event info last updated: 2025.11.09-10:28:11 UTC
Event first association/location: 2025.11.09-09:38:27 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI