Early-est:     Near East Coast of Honshu, Japan    2025.12.13-22:52:57.97    q:C      mb:4.5    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: 4.5 [5]    Mwp: - [0]    Mwpd: - [0] Region: Near East Coast of Honshu, Japan Origin Time: 2025.12.13-22:52:57.97 UTC Hypocenter: lat: 37.08°  lon: 141.21°  [+/-14km]    depth: 65km  [+/-17km] Location Quality: qualityCode:  C     stdErr: 0.8s   assocPhases: 13   usedPhases: 9 minDist: 2.5°   maxDist: 119.7°   AzGap: 180°   2ndAzGap: 198°   atten: -9.90 [+/-0.00] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 14km   azMaxHorUnc: 87° 68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 98°   majorAxisPlunge: 46°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 248°   intermediateAxisPlunge: 40°   semiMinorAxisLength: 13km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.4X [2]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.2Xs [2] Closest plate boundaries:    Pacific \ Okhotsk [subduction zone]: distance: ~170km Subduction geometry:    Zone: Kamchatka/Kurils/Japan    Slab depth at epicenter: 50km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (170km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        65km        65km        65km Slab depth at epicenter:        50km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (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/_polarity
First-motion Focal Mechanism (HASH):    (No solution available) Nodal Plane 1: strike: 999°   dip: 99°   rake: 999° Nodal Plane 2: strike: 324°   dip: 13°   rake: 135° Quality: azimuthalGap: 117°   stationPolarityCount: 4   misfit: 0.99   stationDistributionRatio: 0.77   rmsAngDiffAccPref: 61.16   fracAcc30degPref: 0.00   qualityCode: F 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/1765666376227
Event info last updated: 2025.12.13-23:53:04 UTC
Event first association/location: 2025.12.13-23:06:47 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI