Early-est:     Near S. Coast of Honshu, Japan    2026.02.06-15:58:26.37    q:B      mb:4.4*    Mwp:-    Mwpd:-    Td*T50Ex:-     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: 4.4* [15]    Mwp: - [0]    Mwpd: - [0] Region: Near S. Coast of Honshu, Japan Origin Time: 2026.02.06-15:58:26.37 UTC Hypocenter: lat: 35.91°  lon: 139.87°  [+/-19km]    depth: 84km  [+/-17km] Location Quality: qualityCode:  B     stdErr: 1.2s   assocPhases: 37   usedPhases: 21 minDist: 1.5°   maxDist: 71.5°   AzGap: 165°   2ndAzGap: 173°   atten: -0.72 [+/-0.27] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 19km   azMaxHorUnc: 93° 68%ConfEllipsoid:   semiMajorAxisLength: 24km   majorAxisAzimuth: 273°   majorAxisPlunge: 11°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 108°   intermediateAxisPlunge: 79°   semiMinorAxisLength: 15km Tsunamigeneic Assesment: Discriminants: Prob Underwater: <1% T50Ex: 0.4 [4]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.2s [4] Closest plate boundaries:    Okhotsk - Philippine Sea [continental transform fault]: distance: ~110km    Okhotsk - Amur [continental convergent boundary]: distance: ~140km    Amur / Philippine Sea [subduction zone]: distance: ~150km    Pacific \ Okhotsk [subduction zone]: distance: ~220km    Philippine Sea / Pacific [subduction zone]: distance: ~260km    Okhotsk / Pacific [subduction zone]: distance: ~680km 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 (150km)  no  no Prob underwater:  <1%  <1%  <1% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        84km        84km        84km 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: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 104°   dip: 37°   rake: -83° Nodal Plane 2: strike: 275°   dip: 54°   rake: -95° Quality: azimuthalGap: -1°   stationPolarityCount: 14   misfitWeightCount: 4.6   misfit: 0.03   stationDistributionRatio: 0.43   meanDistP: 51.2   meanDistT: 49.0   qualityCode: D 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: 270°   dip: 47°   rake: -105° Nodal Plane 2: strike: 112°   dip: 45°   rake: -74° Quality: azimuthalGap: 74°   stationPolarityCount: 15   misfit: 0.30   stationDistributionRatio: 0.75   rmsAngDiffAccPref: 32.86   fracAcc30degPref: 0.75   qualityCode: C Method: methodID: smi:gov.usgs/focalmec/HASH_1.2

Event ID: smi:alomax.net_BETA/author/ee/event/1770393506528
Event info last updated: 2026.02.06-16:57:00 UTC
Event first association/location: 2026.02.06-16:12:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA