Early-est:     Hokkaido, Japan Region    2026.02.13-13:57:10.18    q:B      mb:4.2*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1770991027185.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1770991027185.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1770991027185.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: 4.2* [17]    Mwp: - [0]    Mwpd: - [0]
Region: Hokkaido, Japan Region
Origin Time: 2026.02.13-13:57:10.18 UTC
Hypocenter: lat: 44.80°  lon: 141.47°  [+/-22km]    depth: 252km  [+/-20km]
Location Quality: qualityCode:  B     stdErr: 1.2s   assocPhases: 40   usedPhases: 23
minDist: 2.3°   maxDist: 73.6°   AzGap: 108°   2ndAzGap: 137°   atten: -0.89 [+/-0.29]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 22km   azMaxHorUnc: 114°
68%ConfEllipsoid:   semiMajorAxisLength: 29km   majorAxisAzimuth: 117°   majorAxisPlunge: 19°   semiIntermediateAxisLength: 20km   intermediateAxisAzimuth: 232°   intermediateAxisPlunge: 50°   semiMinorAxisLength: 15km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [7]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.4s [6]
Closest plate boundaries:
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?:
 no
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       252km
       252km
       252km
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.1770991027185.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 99°   dip: 18°   rake: -121°
Nodal Plane 2: strike: 312°   dip: 75°   rake: -80°
Quality: azimuthalGap: -1°   stationPolarityCount: 16   misfitWeightCount: 7.3   misfit: 0.16   stationDistributionRatio: 0.47   meanDistP: 49.6   meanDistT: 43.5   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1770991027185.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.1770991027185.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 74°   dip: 60°   rake: -160°
Nodal Plane 2: strike: 334°   dip: 72°   rake: -31°
Quality: azimuthalGap: 145°   stationPolarityCount: 16   misfit: 0.32   stationDistributionRatio: 0.70   rmsAngDiffAccPref: 41.64   fracAcc30degPref: 0.40   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1770991027185.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1770991027185
Event info last updated: 2026.02.13-14:56:03 UTC
Event first association/location: 2026.02.13-14:02:02 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA