Early-est:     Near East Coast of Honshu, Japan    2026.04.01-01:06:19.30    q:B      mb:5.1*    Mwp:-    Mwpd:-    Td*T50Ex:0.3     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: 5.1* [64]    Mwp: 4.7X [2]    Mwpd: 5.3Xinv [1] Region: Near East Coast of Honshu, Japan Origin Time: 2026.04.01-01:06:19.30 UTC Hypocenter: lat: 35.99°  lon: 140.21°  [+/-38km]    depth: 62km  [+/-45km] Location Quality: qualityCode:  B     stdErr: 1.7s   assocPhases: 99   usedPhases: 79 minDist: 1.7°   maxDist: 153.1°   AzGap: 92°   2ndAzGap: 116°   atten: -0.93 [+/-0.16] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 25km   maxHorUnc: 38km   azMaxHorUnc: 109° 68%ConfEllipsoid:   semiMajorAxisLength: 49km   majorAxisAzimuth: 338°   majorAxisPlunge: 56°   semiIntermediateAxisLength: 47km   intermediateAxisAzimuth: 98°   intermediateAxisPlunge: 18°   semiMinorAxisLength: 24km Tsunamigeneic Assesment: Discriminants: Prob Underwater: <1% T50Ex: 0.3 [52]    Td: 0.9s [4]    Td*T50Ex: 0.3 [4]    To: 1.7s [50] Closest plate boundaries:    Okhotsk - Philippine Sea [continental transform fault]: distance: ~140km    Okhotsk - Amur [continental convergent boundary]: distance: ~170km    Amur / Philippine Sea [subduction zone]: distance: ~170km    Pacific \ Okhotsk [subduction zone]: distance: ~190km    Philippine Sea / Pacific [subduction zone]: distance: ~250km    Okhotsk / Pacific [subduction zone]: distance: ~650km    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 (170km)  no  no Prob underwater:  <1%  <1%  <1% Td*T50Ex:    0.3    0.3    0.3 Td*To:      1.5      1.5      1.5 Mwp magnitude:        -        -        - Hypocenter depth:        62km        62km        62km 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):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 157°   dip: 55°   rake: 37° Nodal Plane 2: strike: 43°   dip: 60°   rake: 139° Quality: azimuthalGap: -1°   stationPolarityCount: 60   misfitWeightCount: 13.8   misfit: 0.16   stationDistributionRatio: 0.57   meanDistP: 34.0   meanDistT: 35.1   qualityCode: C Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
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
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 196°   dip: 38°   rake: 95° Nodal Plane 2: strike: 9°   dip: 52°   rake: 86° Quality: azimuthalGap: 46°   stationPolarityCount: 60   misfit: 0.34   stationDistributionRatio: 0.68   rmsAngDiffAccPref: 34.95   fracAcc30degPref: 0.65   qualityCode: C Method: methodID: smi:gov.usgs/focalmec/HASH_1.2

Event ID: smi:alomax.net_BETA/author/ee/event/1775005578411
Event info last updated: 2026.04.01-02:05:00 UTC
Event first association/location: 2026.04.01-01:09:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA