Early-est:     Near East Coast of Honshu, Japan    2026.10.07-19:13:46.69    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 [43]    Mwp: 5.1X [2]    Mwpd: - [0] Region: Near East Coast of Honshu, Japan Origin Time: 2026.10.07-19:13:46.69 UTC Hypocenter: lat: 35.52°  lon: 140.87°  [+/-7km]    depth: 34km  [+/-9km] Location Quality: qualityCode:  A     stdErr: 1.2s   assocPhases: 79   usedPhases: 55 minDist: 2.6°   maxDist: 147.8°   AzGap: 111°   2ndAzGap: 157°   atten: -1.44 [+/-0.13] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 7km   maxHorUnc: 7km   azMaxHorUnc: 70° 68%ConfEllipsoid:   semiMajorAxisLength: 9km   majorAxisAzimuth: 62°   majorAxisPlunge: 48°   semiIntermediateAxisLength: 9km   intermediateAxisAzimuth: 264°   intermediateAxisPlunge: 40°   semiMinorAxisLength: 8km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.4 [30]    Td: -s [0]    Td*T50Ex: - [0]    To: 3.0s [20] Closest plate boundaries:    Okhotsk - Philippine Sea [oceanic convergent boundary]: distance: ~110km    Pacific \ Okhotsk [subduction zone]: distance: ~120km    Philippine Sea / Pacific [subduction zone]: distance: ~170km Subduction geometry:    Zone: Kamchatka/Kurils/Japan    Slab depth at epicenter: 35km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (120km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        34km        34km        34km Slab depth at epicenter:        35km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 121°   dip: 22°   rake: -145° Nodal Plane 2: strike: 358°   dip: 78°   rake: -71° Quality: azimuthalGap: -1°   stationPolarityCount: 49   misfitWeightCount: 7.5   misfit: 0.11   stationDistributionRatio: 0.49   meanDistP: 35.4   meanDistT: 37.5   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: 194°   dip: 72°   rake: -154° Nodal Plane 2: strike: 95°   dip: 65°   rake: -20° Quality: azimuthalGap: 111°   stationPolarityCount: 49   misfit: 0.38   stationDistributionRatio: 0.64   rmsAngDiffAccPref: 46.02   fracAcc30degPref: 0.28   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/1791400426057
Event info last updated: 2026.10.07-20:13:48 UTC
Event first association/location: 2026.10.07-19:16:32 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI