Early-est:     Eastern Honshu, Japan    2026.09.28-19:45:09.42    q:C      mb:5.0*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:     fmamp_polarity_waveform:     hash:

Automatic solution - this event has not been reviewed by a seismologist
Automatically determined event information may be incorrect!

Earthquake Details: Magnitude: mb: 5.0* [43]    Mwp: 4.6X [2]    Mwpd: - [0] Region: Eastern Honshu, Japan Origin Time: 2026.09.28-19:45:09.42 UTC Hypocenter: lat: 36.19°  lon: 139.74°  [+/-40km]    depth: 65km  [+/-44km] Location Quality: qualityCode:  C     stdErr: 1.8s   assocPhases: 74   usedPhases: 50 minDist: 1.3°   maxDist: 148.3°   AzGap: 108°   2ndAzGap: 111°   atten: -0.89 [+/-0.23] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 23km   maxHorUnc: 40km   azMaxHorUnc: 99° 68%ConfEllipsoid:   semiMajorAxisLength: 50km   majorAxisAzimuth: 277°   majorAxisPlunge: 11°   semiIntermediateAxisLength: 44km   intermediateAxisAzimuth: 149°   intermediateAxisPlunge: 72°   semiMinorAxisLength: 27km Tsunamigeneic Assesment: Discriminants: Prob Underwater: <1% T50Ex: 0.5 [33]    Td: -s [0]    Td*T50Ex: - [0]    To: 15.2s [29] Closest plate boundaries:    Okhotsk - Philippine Sea [continental transform fault]: distance: ~140km    Okhotsk - Amur [continental convergent boundary]: distance: ~140km    Amur / Philippine Sea [subduction zone]: distance: ~160km    Pacific \ Okhotsk [subduction zone]: distance: ~240km    Philippine Sea / Pacific [subduction zone]: distance: ~290km    Okhotsk / Pacific [subduction zone]: distance: ~660km Subduction geometry:    Zone: Kamchatka/Kurils/Japan: DEBUG: error: [Errno 2] No such file or directory: 'gmt'    Slab depth at epicenter: error: evaluating slab depth: -999.9 Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (160km)  YES (140km)  no Prob underwater:  <1%  <1%  <1% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        65km        65km        65km Slab depth at epicenter:        n/a        -        - Tsunami and Rupture predictions (TEST!): No prediction: Event too small (Mwp<7.0) or too few Mwp readings (N<20)

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 255°   dip: 24°   rake: 70° Nodal Plane 2: strike: 98°   dip: 68°   rake: 99° Quality: azimuthalGap: -1°   stationPolarityCount: 44   misfitWeightCount: 12.4   misfit: 0.22   stationDistributionRatio: 0.58   meanDistP: 47.7   meanDistT: 44.4   qualityCode: D Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (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_waveform
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 335°   dip: 83°   rake: -164° Nodal Plane 2: strike: 243°   dip: 74°   rake: -7° Quality: azimuthalGap: 60°   stationPolarityCount: 44   misfit: 0.51   stationDistributionRatio: 0.69   rmsAngDiffAccPref: 28.65   fracAcc30degPref: 0.86   qualityCode: C Method: methodID: smi:gov.usgs/focalmec/HASH_1.2

Event ID: smi:alomax.net_BETA/author/ee/event/1790624705693
Event info last updated: 2026.09.28-20:44:00 UTC
Event first association/location: 2026.09.28-19:47:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA