Early-est:     Off East Coast of Honshu, Japan    2025.11.09-08:49:54.58    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 [42]    Mwp: - [0]    Mwpd: - [0] Region: Off East Coast of Honshu, Japan Origin Time: 2025.11.09-08:49:54.58 UTC Hypocenter: lat: 39.31°  lon: 143.46°  [+/-13km]    depth: 20km  [+/-12km] Location Quality: qualityCode:  A     stdErr: 1.1s   assocPhases: 66   usedPhases: 49 minDist: 5.0°   maxDist: 143.5°   AzGap: 113°   2ndAzGap: 131°   atten: -1.17 [+/-0.22] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 10km   maxHorUnc: 13km   azMaxHorUnc: 96° 68%ConfEllipsoid:   semiMajorAxisLength: 16km   majorAxisAzimuth: 97°   majorAxisPlunge: 4°   semiIntermediateAxisLength: 13km   intermediateAxisAzimuth: 191°   intermediateAxisPlunge: 47°   semiMinorAxisLength: 11km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.6 [34]    Td: 14.6Xs [1]    Td*T50Ex: - [0]    To: 41.1s [26] Closest plate boundaries:    Pacific \ Okhotsk [subduction zone]: distance: ~60km    Okhotsk / Pacific [subduction zone]: distance: ~190km Subduction geometry:    Zone: Kamchatka/Kurils/Japan    Slab depth at epicenter: 14km 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:        14km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 219°   dip: 49°   rake: -158° Nodal Plane 2: strike: 115°   dip: 74°   rake: -43° Quality: azimuthalGap: -1°   stationPolarityCount: 44   misfitWeightCount: 9.3   misfit: 0.17   stationDistributionRatio: 0.39   meanDistP: 49.4   meanDistT: 51.4   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: 222°   dip: 53°   rake: -162° Nodal Plane 2: strike: 121°   dip: 76°   rake: -38° Quality: azimuthalGap: 113°   stationPolarityCount: 44   misfit: 0.30   stationDistributionRatio: 0.66   rmsAngDiffAccPref: 43.65   fracAcc30degPref: 0.56   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: 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/1762678194379
Event info last updated: 2025.11.09-09:49:12 UTC
Event first association/location: 2025.11.09-09:01:04 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI