Early-est:     Kyushu, Japan    2026.09.26-01:31:10.43    q:C      mb:4.4*    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: 4.4* [6]    Mwp: 4.2X [1]    Mwpd: - [0] Region: Kyushu, Japan Origin Time: 2026.09.26-01:31:10.43 UTC Hypocenter: lat: 32.20°  lon: 129.79°  [+/-18km]    depth: 224km  [+/-23km] Location Quality: qualityCode:  C     stdErr: 1.6s   assocPhases: 13   usedPhases: 8 minDist: 0.9°   maxDist: 38.1°   AzGap: 133°   2ndAzGap: 201°   atten: -0.36 [+/-0.64] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 17km   maxHorUnc: 18km   azMaxHorUnc: 137° 68%ConfEllipsoid:   semiMajorAxisLength: 25km   majorAxisAzimuth: 330°   majorAxisPlunge: 55°   semiIntermediateAxisLength: 21km   intermediateAxisAzimuth: 79°   intermediateAxisPlunge: 13°   semiMinorAxisLength: 21km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.4 [4]    Td: 0.4Xs [2]    Td*T50Ex: - [0]    To: 6.2s [4] Closest plate boundaries:    Amur - Okinawa [continental rift boundary]: distance: ~20km    Yangtze - Okinawa [continental transform fault]: distance: ~60km    Amur - Yangtze [continental transform fault]: distance: ~60km    Okinawa / Philippine Sea [subduction zone]: distance: ~330km    Amur / Philippine Sea [subduction zone]: distance: ~330km Subduction geometry: none or not available Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (330km)  no  YES (60km) Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        224km        224km        224km 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):    (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 (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):    (No solution available) Nodal Plane 1: strike: 999°   dip: 99°   rake: 999° Nodal Plane 2: strike: 324°   dip: 13°   rake: 135° Quality: azimuthalGap: 0°   stationPolarityCount: 5   misfit: 0.99   stationDistributionRatio: 0.00   rmsAngDiffAccPref: 0.00   fracAcc30degPref: 0.00   qualityCode: F Method: methodID: smi:gov.usgs/focalmec/HASH_1.2

Event ID: smi:alomax.net_BETA/author/ee/event/1790386279970
Event info last updated: 2026.09.26-02:30:00 UTC
Event first association/location: 2026.09.26-01:35:03 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA