Early-est:     Near West Coast of Honshu, Japan    2025.12.14-14:26:53.12    q:A      mb:5.1    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: 5.1 [109]    Mwp: 6.3X [1]    Mwpd: 6.2Xinv [1] Region: Near West Coast of Honshu, Japan Origin Time: 2025.12.14-14:26:53.12 UTC Hypocenter: lat: 36.93°  lon: 136.72°  [+/-9km]    depth: 16km  [+/-13km] Location Quality: qualityCode:  A     stdErr: 1.2s   assocPhases: 153   usedPhases: 125 minDist: 1.2°   maxDist: 165.1°   AzGap: 46°   2ndAzGap: 54°   atten: -0.79 [+/-0.13] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 6km   maxHorUnc: 9km   azMaxHorUnc: 2° 68%ConfEllipsoid:   semiMajorAxisLength: 14km   majorAxisAzimuth: 185°   majorAxisPlunge: 62°   semiIntermediateAxisLength: 10km   intermediateAxisAzimuth: 356°   intermediateAxisPlunge: 28°   semiMinorAxisLength: 8km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.0 [62]    Td: 1.4Xs [3]    Td*T50Ex: - [0]    To: 1.5s [56] Closest plate boundaries:    Okhotsk - Amur [continental convergent boundary]: distance: ~110km Subduction geometry:    Zone: Kamchatka/Kurils/Japan    Slab depth at epicenter: 230km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  no  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        16km        16km        16km Slab depth at epicenter:        230km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 251°   dip: 43°   rake: -98° Nodal Plane 2: strike: 81°   dip: 47°   rake: -83° Quality: azimuthalGap: -1°   stationPolarityCount: 114   misfitWeightCount: 15.3   misfit: 0.18   stationDistributionRatio: 0.39   meanDistP: 34.7   meanDistT: 25.9   qualityCode: C 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: 249°   dip: 37°   rake: -87° Nodal Plane 2: strike: 65°   dip: 53°   rake: -92° Quality: azimuthalGap: 46°   stationPolarityCount: 114   misfit: 0.30   stationDistributionRatio: 0.65   rmsAngDiffAccPref: 35.93   fracAcc30degPref: 0.55   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: 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/1765722416360
Event info last updated: 2025.12.14-15:27:05 UTC
Event first association/location: 2025.12.14-14:29:03 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI