Early-est:     Near East Coast of Honshu, Japan    2026.06.26-03:46:37.09    q:A      mb:5.3    Mwp:5.9*    Mwpd:-    Td*T50Ex:1.4     fmamp_polarity:     fmamp_polarity_waveform:     hash:

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

Earthquake Details: Magnitude: mb: 5.3 [123]    Mwp: 5.9* [69]    Mwpd: 6.0Xinv [69] Region: Near East Coast of Honshu, Japan Origin Time: 2026.06.26-03:46:37.09 UTC Hypocenter: lat: 35.59°  lon: 140.63°  [+/-10km]    depth: 50km  [+/-19km] Location Quality: qualityCode:  A     stdErr: 1.4s   assocPhases: 194   usedPhases: 133 minDist: 2.2°   maxDist: 154.4°   AzGap: 42°   2ndAzGap: 55°   atten: -1.14 [+/-0.14] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 8km   maxHorUnc: 10km   azMaxHorUnc: 92° 68%ConfEllipsoid:   semiMajorAxisLength: 21km   majorAxisAzimuth: 271°   majorAxisPlunge: 65°   semiIntermediateAxisLength: 10km   intermediateAxisAzimuth: 177°   intermediateAxisPlunge: 2°   semiMinorAxisLength: 9km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.5 [106]    Td: 2.9s [13]    Td*T50Ex: 1.4 [13]    To: 23.8s [102] Closest plate boundaries:    Okhotsk - Philippine Sea [oceanic convergent boundary]: distance: ~110km    Pacific \ Okhotsk [subduction zone]: distance: ~140km    Okhotsk - Amur [continental convergent boundary]: distance: ~190km    Amur / Philippine Sea [subduction zone]: distance: ~190km    Philippine Sea / Pacific [subduction zone]: distance: ~190km    Okhotsk / Pacific [subduction zone]: distance: ~670km    Okinawa / Philippine Sea [subduction zone]: distance: ~900km 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 (140km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    1.4    1.4    1.4 Td*To:      69.0      69.0      69.0 Mwp magnitude:        5.9*        5.9*        5.9* Hypocenter depth:        50km        50km        50km 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)

First-motion Focal Mechanism (FMAMP_POLARITY): Nodal Plane 1: strike: 90°   dip: 1°   rake: -8° Nodal Plane 2: strike: 188°   dip: 90°   rake: -91° Quality: azimuthalGap: -1°   stationPolarityCount: 115   misfitWeightCount: 25.1   misfit: 0.13   stationDistributionRatio: 0.53   meanDistP: 18.7   meanDistT: 13.5   qualityCode: A Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 149°   dip: 25°   rake: 70° Nodal Plane 2: strike: 350°   dip: 66°   rake: 99° Quality: azimuthalGap: -1°   stationPolarityCount: 28   misfitWeightCount: 6.1   misfit: 0.00   stationDistributionRatio: 0.71   meanDistP: 46.2   meanDistT: 32.3   qualityCode: C Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity_waveform
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 267°   dip: 32°   rake: 132° Nodal Plane 2: strike: 40°   dip: 67°   rake: 67° Quality: azimuthalGap: 36°   stationPolarityCount: 115   misfit: 0.12   stationDistributionRatio: 0.71   rmsAngDiffAccPref: 32.68   fracAcc30degPref: 0.63   qualityCode: C Method: methodID: smi:gov.usgs/focalmec/HASH_1.2

Event ID: smi:alomax.net_BETA/author/ee/event/1782445596680
Event info last updated: 2026.06.26-04:45:01 UTC
Event first association/location: 2026.06.26-03:48:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA