Early-est:     Kyushu, Japan    2026.08.10-17:47:20.16    q:C      mb:-    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1786384040161.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1786384040161.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1786384040161.mech.hash.thumb.jpg

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

Earthquake Details:
Magnitude: mb: 4.1X [3]    Mwp: - [0]    Mwpd: - [0]
Region: Kyushu, Japan
Origin Time: 2026.08.10-17:47:20.16 UTC
Hypocenter: lat: 32.31°  lon: 130.55°  [+/-14km]    depth: 15km  [+/-13km]
Location Quality: qualityCode:  C     stdErr: 0.7s   assocPhases: 6   usedPhases: 6
minDist: 0.8°   maxDist: 45.2°   AzGap: 228°   2ndAzGap: 235°   atten: -1.17 [+/-0.79]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 9km   maxHorUnc: 14km   azMaxHorUnc: 103°
68%ConfEllipsoid:   semiMajorAxisLength: 17km   majorAxisAzimuth: 283°   majorAxisPlunge: 7°   semiIntermediateAxisLength: 13km   intermediateAxisAzimuth: 64°   intermediateAxisPlunge: 81°   semiMinorAxisLength: 11km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: 13%
T50Ex: 0.5X [3]    Td: -s [0]    Td*T50Ex: - [0]    To: 2.6Xs [3]
Closest plate boundaries:
   Amur - Okinawa [continental rift boundary]: distance: ~50km
   Yangtze - Okinawa [continental transform fault]: distance: ~120km
   Amur - Yangtze [continental transform fault]: distance: ~120km
   Amur / Philippine Sea [subduction zone]: distance: ~270km
   Okinawa / Philippine Sea [subduction zone]: distance: ~280km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 no
 no
 no
Prob underwater:
 13%
 13%
 13%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       15km
       15km
       15km
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)
./hypo.1786384040161.map.jpg

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
./hypo.1786384040161.mech.fmamp_polarity.mechanism.jpg
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
./hypo.1786384040161.mech.fmamp_polarity_waveform.mechanism.jpg
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: 3   misfit: 0.99   stationDistributionRatio: 0.00   rmsAngDiffAccPref: 0.00   fracAcc30degPref: 0.00   qualityCode: F
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1786384040161.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1786384040161
Event info last updated: 2026.08.10-18:46:00 UTC
Event first association/location: 2026.08.10-17:59:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA