Early-est:     Near East Coast of Honshu, Japan    2026.06.25-16:11:46.50    q:C      mb:4.8*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1782403906142.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1782403906142.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1782403906142.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* [26]    Mwp: 4.2X [1]    Mwpd: - [0]
Region: Near East Coast of Honshu, Japan
Origin Time: 2026.06.25-16:11:46.50 UTC
Hypocenter: lat: 40.52°  lon: 141.99°  [+/-29km]    depth: 52km  [+/-37km]
Location Quality: qualityCode:  C     stdErr: 1.2s   assocPhases: 48   usedPhases: 31
minDist: 0.8°   maxDist: 115.8°   AzGap: 173°   2ndAzGap: 174°   atten: -0.76 [+/-0.19]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 19km   maxHorUnc: 29km   azMaxHorUnc: 123°
68%ConfEllipsoid:   semiMajorAxisLength: 40km   majorAxisAzimuth: 125°   majorAxisPlunge: 47°   semiIntermediateAxisLength: 33km   intermediateAxisAzimuth: 298°   intermediateAxisPlunge: 42°   semiMinorAxisLength: 23km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.3 [11]    Td: -s [0]    Td*T50Ex: - [0]    To: 3.2s [11]
Closest plate boundaries:
   Pacific \ Okhotsk [subduction zone]: distance: ~200km
   Okhotsk / Pacific [subduction zone]: distance: ~210km
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 (200km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       52km
       52km
       52km
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.1782403906142.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 190°   dip: 19°   rake: 86°
Nodal Plane 2: strike: 15°   dip: 71°   rake: 91°
Quality: azimuthalGap: -1°   stationPolarityCount: 25   misfitWeightCount: 7.1   misfit: 0.15   stationDistributionRatio: 0.49   meanDistP: 50.2   meanDistT: 47.0   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1782403906142.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.1782403906142.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 357°   dip: 42°   rake: -145°
Nodal Plane 2: strike: 240°   dip: 67°   rake: -53°
Quality: azimuthalGap: 98°   stationPolarityCount: 25   misfit: 0.23   stationDistributionRatio: 0.58   rmsAngDiffAccPref: 28.48   fracAcc30degPref: 0.78   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1782403906142.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1782403906142
Event info last updated: 2026.06.25-17:10:00 UTC
Event first association/location: 2026.06.25-16:20:03 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA