Early-est:     Kuril Islands    2025.08.01-10:55:04.43    q:B      mb:5.2    Mwp:5.9*    Mwpd:-    Td*T50Ex:2.2     fmamp_polarity:./hypo.1754045702648.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1754045702648.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1754045702648.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: 5.2 [83]    Mwp: 5.9* [38]    Mwpd: 6.1Xinv [36]
Region: Kuril Islands
Origin Time: 2025.08.01-10:55:04.43 UTC
Hypocenter: lat: 50.67°  lon: 157.78°  [+/-20km]    depth: 55km  [+/-31km]
Location Quality: qualityCode:  B     stdErr: 1.3s   assocPhases: 170   usedPhases: 93
minDist: 2.4°   maxDist: 145.5°   AzGap: 97°   2ndAzGap: 120°   atten: -0.38 [+/-0.22]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 20km   azMaxHorUnc: 128°
68%ConfEllipsoid:   semiMajorAxisLength: 35km   majorAxisAzimuth: 302°   majorAxisPlunge: 57°   semiIntermediateAxisLength: 18km   intermediateAxisAzimuth: 148°   intermediateAxisPlunge: 31°   semiMinorAxisLength: 14km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [65]    Td: 4.2s [14]    Td*T50Ex: 2.2 [14]    To: 24.6s [61]
Closest plate boundaries:
   Okhotsk / Pacific [subduction zone]: distance: ~110km
   North America / Pacific [subduction zone]: distance: ~660km
   Okhotsk / North America [subduction zone]: distance: ~660km
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 (110km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   2.2
   2.2
   2.2
Td*To:
     103.3
     103.3
     103.3
Mwp magnitude:
       5.9*
       5.9*
       5.9*
Hypocenter depth:
       55km
       55km
       55km
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.1754045702648.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 176°   dip: 54°   rake: -159°
Nodal Plane 2: strike: 73°   dip: 73°   rake: -38°
Quality: azimuthalGap: -1°   stationPolarityCount: 88   misfitWeightCount: 15.6   misfit: 0.10   stationDistributionRatio: 0.49   meanDistP: 37.8   meanDistT: 29.3   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1754045702648.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 230°   dip: 38°   rake: -88°
Nodal Plane 2: strike: 47°   dip: 52°   rake: -91°
Quality: azimuthalGap: -1°   stationPolarityCount: 17   misfitWeightCount: 3.8   misfit: 0.01   stationDistributionRatio: 0.52   meanDistP: 44.0   meanDistT: 46.8   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity_waveform
./hypo.1754045702648.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 202°   dip: 38°   rake: -113°
Nodal Plane 2: strike: 50°   dip: 55°   rake: -73°
Quality: azimuthalGap: 119°   stationPolarityCount: 88   misfit: 0.33   stationDistributionRatio: 0.76   rmsAngDiffAccPref: 25.55   fracAcc30degPref: 0.84   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1754045702648.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1754045702648
Event info last updated: 2025.08.01-11:54:03 UTC
Event first association/location: 2025.08.01-11:01:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA