Early-est:     Off East Coast of Honshu, Japan    2025.12.14-07:58:16.43    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 [43]    Mwp: 5.3X [1]    Mwpd: - [0] Region: Off East Coast of Honshu, Japan Origin Time: 2025.12.14-07:58:16.43 UTC Hypocenter: lat: 39.79°  lon: 143.49°  [+/-14km]    depth: 20km  [+/-13km] Location Quality: qualityCode:  B     stdErr: 1.1s   assocPhases: 88   usedPhases: 55 minDist: 2.1°   maxDist: 152.8°   AzGap: 107°   2ndAzGap: 144°   atten: -1.17 [+/-0.20] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 14km   azMaxHorUnc: 121° 68%ConfEllipsoid:   semiMajorAxisLength: 17km   majorAxisAzimuth: 300°   majorAxisPlunge: 1°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 210°   intermediateAxisPlunge: 24°   semiMinorAxisLength: 12km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.5 [35]    Td: 3.1Xs [1]    Td*T50Ex: - [0]    To: 19.4s [27] Closest plate boundaries:    Pacific \ Okhotsk [subduction zone]: distance: ~60km    Okhotsk / Pacific [subduction zone]: distance: ~140km Subduction geometry:    Zone: Kamchatka/Kurils/Japan    Slab depth at epicenter: 16km 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:        20km        20km        20km Slab depth at epicenter:        16km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 66°   dip: 53°   rake: -14° Nodal Plane 2: strike: 165°   dip: 79°   rake: -142° Quality: azimuthalGap: -1°   stationPolarityCount: 49   misfitWeightCount: 8.9   misfit: 0.15   stationDistributionRatio: 0.27   meanDistP: 38.2   meanDistT: 46.5   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: 22°   dip: 25°   rake: -86° Nodal Plane 2: strike: 197°   dip: 65°   rake: -92° Quality: azimuthalGap: 93°   stationPolarityCount: 49   misfit: 0.21   stationDistributionRatio: 0.65   rmsAngDiffAccPref: 24.42   fracAcc30degPref: 0.73   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: nan° Nodal Plane 2: strike: nan°   dip: nan°   rake: nan° 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: nan° Nodal Plane 2: strike: nan°   dip: nan°   rake: nan° 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/1765699091795
Event info last updated: 2025.12.14-08:58:29 UTC
Event first association/location: 2025.12.14-08:07:32 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI