Early-est:     Near East Coast of Honshu, Japan    2025.12.12-10:05:18.42    q:A      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 [69]    Mwp: - [0]    Mwpd: - [0] Region: Near East Coast of Honshu, Japan Origin Time: 2025.12.12-10:05:18.42 UTC Hypocenter: lat: 36.13°  lon: 140.22°  [+/-9km]    depth: 35km  [+/-17km] Location Quality: qualityCode:  A     stdErr: 1.3s   assocPhases: 108   usedPhases: 85 minDist: 1.7°   maxDist: 148.0°   AzGap: 95°   2ndAzGap: 110°   atten: -1.46 [+/-0.12] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 8km   maxHorUnc: 9km   azMaxHorUnc: 115° 68%ConfEllipsoid:   semiMajorAxisLength: 17km   majorAxisAzimuth: 216°   majorAxisPlunge: 75°   semiIntermediateAxisLength: 11km   intermediateAxisAzimuth: 118°   intermediateAxisPlunge: 2°   semiMinorAxisLength: 9km Tsunamigeneic Assesment: Discriminants: Prob Underwater: <1% T50Ex: 0.5 [46]    Td: -s [0]    Td*T50Ex: - [0]    To: 28.3s [37] Closest plate boundaries:    Okhotsk - Philippine Sea [continental transform fault]: distance: ~150km    Okhotsk - Amur [continental convergent boundary]: distance: ~180km    Amur / Philippine Sea [subduction zone]: distance: ~190km    Pacific \ Okhotsk [subduction zone]: distance: ~200km    Philippine Sea / Pacific [subduction zone]: distance: ~260km    Okhotsk / Pacific [subduction zone]: distance: ~640km Subduction geometry:    Zone: Kamchatka/Kurils/Japan    Slab depth at epicenter: 65km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (190km)  no  no Prob underwater:  <1%  <1%  <1% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        35km        35km        35km Slab depth at epicenter:        65km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 1°   dip: 51°   rake: -50° Nodal Plane 2: strike: 128°   dip: 53°   rake: -129° Quality: azimuthalGap: -1°   stationPolarityCount: 75   misfitWeightCount: 11.6   misfit: 0.22   stationDistributionRatio: 0.54   meanDistP: 28.6   meanDistT: 38.1   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: 5°   dip: 21°   rake: -92° Nodal Plane 2: strike: 187°   dip: 69°   rake: -89° Quality: azimuthalGap: 122°   stationPolarityCount: 76   misfit: 0.28   stationDistributionRatio: 0.70   rmsAngDiffAccPref: 35.82   fracAcc30degPref: 0.46   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/1765533920899
Event info last updated: 2025.12.12-11:05:32 UTC
Event first association/location: 2025.12.12-10:07:26 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI