Early-est:     Near East Coast of Honshu, Japan    2026.10.01-12:40:03.14    q:C      mb:-    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1790858400881.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1790858400881.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1790858400881.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: 4.6X [2]    Mwp: - [0]    Mwpd: - [0]
Region: Near East Coast of Honshu, Japan
Origin Time: 2026.10.01-12:40:03.14 UTC
Hypocenter: lat: 35.75°  lon: 140.81°  [+/-16km]    depth: 47km  [+/-48km]
Location Quality: qualityCode:  C     stdErr: 1.2s   assocPhases: 7   usedPhases: 7
minDist: 2.2°   maxDist: 84.5°   AzGap: 195°   2ndAzGap: 262°   atten: -9.90 [+/-0.00]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 16km   azMaxHorUnc: 81°
68%ConfEllipsoid:   semiMajorAxisLength: 49km   majorAxisAzimuth: 260°   majorAxisPlunge: 81°   semiIntermediateAxisLength: 18km   intermediateAxisAzimuth: 83°   intermediateAxisPlunge: 9°   semiMinorAxisLength: 17km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: 87%
T50Ex: 0.0X [1]    Td: -s [0]    Td*T50Ex: - [0]    To: 0.6Xs [1]
Closest plate boundaries:
   Okhotsk - Philippine Sea [oceanic convergent boundary]: distance: ~130km
   Pacific \ Okhotsk [subduction zone]: distance: ~130km
   Philippine Sea / Pacific [subduction zone]: distance: ~200km
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 (130km)
 no
 no
Prob underwater:
 87%
 87%
 87%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       47km
       47km
       47km
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.1790858400881.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.1790858400881.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.1790858400881.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: 234°   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.1790858400881.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1790858400881
Event info last updated: 2026.10.01-13:39:00 UTC
Event first association/location: 2026.10.01-12:48:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA