Early-est:     Kyushu, Japan    2025.08.06-23:47:48.51    q:C      mb:4.6*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1754524070078.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1754524070078.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1754524070078.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: 4.6* [15]    Mwp: - [0]    Mwpd: - [0]
Region: Kyushu, Japan
Origin Time: 2025.08.06-23:47:48.51 UTC
Hypocenter: lat: 33.07°  lon: 131.04°  [+/-26km]    depth: 9km  [+/-120km]
Location Quality: qualityCode:  C     stdErr: 3.4s   assocPhases: 52   usedPhases: 18
minDist: 1.6°   maxDist: 152.5°   AzGap: 108°   2ndAzGap: 119°   atten: -0.87 [+/-0.23]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 22km   maxHorUnc: 26km   azMaxHorUnc: 54°
68%ConfEllipsoid:   semiMajorAxisLength: 121km   majorAxisAzimuth: 239°   majorAxisPlunge: 83°   semiIntermediateAxisLength: 28km   intermediateAxisAzimuth: 33°   intermediateAxisPlunge: 6°   semiMinorAxisLength: 27km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.0 [6]    Td: 1.9Xs [1]    Td*T50Ex: - [0]    To: 3.5s [6]
Closest plate boundaries:
   Amur - Okinawa [continental rift boundary]: distance: ~120km
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:
 <1%
 <1%
 <1%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       9km
       9km
       9km
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.1754524070078.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 147°   dip: 12°   rake: 22°
Nodal Plane 2: strike: 36°   dip: 85°   rake: 101°
Quality: azimuthalGap: -1°   stationPolarityCount: 17   misfitWeightCount: 3.7   misfit: 0.06   stationDistributionRatio: 0.65   meanDistP: 45.9   meanDistT: 43.4   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1754524070078.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.1754524070078.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 109°   dip: 41°   rake: 37°
Nodal Plane 2: strike: 349°   dip: 67°   rake: 125°
Quality: azimuthalGap: 118°   stationPolarityCount: 12   misfit: 0.27   stationDistributionRatio: 0.73   rmsAngDiffAccPref: 41.86   fracAcc30degPref: 0.37   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1754524070078.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1754524070078
Event info last updated: 2025.08.07-00:46:00 UTC
Event first association/location: 2025.08.06-23:50:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA