Early-est:     Kyushu, Japan    2026.08.12-04:06:03.95    q:C      mb:4.8*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1786507564224.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1786507564224.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1786507564224.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: 4.8* [23]    Mwp: 4.6X [1]    Mwpd: - [0]
Region: Kyushu, Japan
Origin Time: 2026.08.12-04:06:03.95 UTC
Hypocenter: lat: 32.61°  lon: 131.04°  [+/-34km]    depth: 86km  [+/-55km]
Location Quality: qualityCode:  C     stdErr: 1.9s   assocPhases: 50   usedPhases: 24
minDist: 0.5°   maxDist: 90.9°   AzGap: 72°   2ndAzGap: 126°   atten: -0.91 [+/-0.23]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 21km   maxHorUnc: 34km   azMaxHorUnc: 143°
68%ConfEllipsoid:   semiMajorAxisLength: 63km   majorAxisAzimuth: 133°   majorAxisPlunge: 56°   semiIntermediateAxisLength: 31km   intermediateAxisAzimuth: 2°   intermediateAxisPlunge: 24°   semiMinorAxisLength: 22km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.3 [16]    Td: 0.7Xs [1]    Td*T50Ex: - [0]    To: 6.0s [15]
Closest plate boundaries:
   Amur - Okinawa [continental rift boundary]: distance: ~70km
   Yangtze - Okinawa [continental transform fault]: distance: ~180km
   Amur - Yangtze [continental transform fault]: distance: ~180km
   Amur / Philippine Sea [subduction zone]: distance: ~260km
   Okinawa / Philippine Sea [subduction zone]: distance: ~270km
Subduction geometry:    Zone: Ryukyu: 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 (260km)
 no
 no
Prob underwater:
 <1%
 <1%
 <1%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       86km
       86km
       86km
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.1786507564224.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 251°   dip: 18°   rake: 139°
Nodal Plane 2: strike: 20°   dip: 79°   rake: 76°
Quality: azimuthalGap: -1°   stationPolarityCount: 26   misfitWeightCount: 8.7   misfit: 0.12   stationDistributionRatio: 0.57   meanDistP: 47.6   meanDistT: 43.8   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1786507564224.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.1786507564224.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 286°   dip: 31°   rake: 154°
Nodal Plane 2: strike: 38°   dip: 77°   rake: 62°
Quality: azimuthalGap: 104°   stationPolarityCount: 26   misfit: 0.25   stationDistributionRatio: 0.69   rmsAngDiffAccPref: 22.87   fracAcc30degPref: 0.88   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1786507564224.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1786507564224
Event info last updated: 2026.08.12-05:05:00 UTC
Event first association/location: 2026.08.12-04:18:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA