Early-est:     Near West Coast of Honshu, Japan    2025.12.14-19:03:38.38    q:A      mb:4.9    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: 4.9 [61]    Mwp: - [0]    Mwpd: - [0] Region: Near West Coast of Honshu, Japan Origin Time: 2025.12.14-19:03:38.38 UTC Hypocenter: lat: 36.95°  lon: 136.69°  [+/-6km]    depth: 11km  [+/-8km] Location Quality: qualityCode:  A     stdErr: 1.2s   assocPhases: 87   usedPhases: 77 minDist: 1.3°   maxDist: 149.9°   AzGap: 55°   2ndAzGap: 105°   atten: -0.97 [+/-0.14] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 5km   maxHorUnc: 6km   azMaxHorUnc: 103° 68%ConfEllipsoid:   semiMajorAxisLength: 9km   majorAxisAzimuth: 102°   majorAxisPlunge: 44°   semiIntermediateAxisLength: 6km   intermediateAxisAzimuth: 9°   intermediateAxisPlunge: 4°   semiMinorAxisLength: 6km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.0 [23]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.4s [20] Closest plate boundaries:    Okhotsk - Amur [continental convergent boundary]: distance: ~110km Subduction geometry:    Zone: Kamchatka/Kurils/Japan    Slab depth at epicenter: 232km 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:        11km        11km        11km Slab depth at epicenter:        232km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 102°   dip: 73°   rake: 5° Nodal Plane 2: strike: 10°   dip: 85°   rake: 163° Quality: azimuthalGap: -1°   stationPolarityCount: 72   misfitWeightCount: 12.4   misfit: 0.11   stationDistributionRatio: 0.39   meanDistP: 44.0   meanDistT: 27.6   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: 52°   dip: 49°   rake: -84° Nodal Plane 2: strike: 223°   dip: 41°   rake: -97° Quality: azimuthalGap: 54°   stationPolarityCount: 72   misfit: 0.31   stationDistributionRatio: 0.66   rmsAngDiffAccPref: 35.75   fracAcc30degPref: 0.57   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/1765739020667
Event info last updated: 2025.12.14-20:03:47 UTC
Event first association/location: 2025.12.14-19:06:31 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI