Early-est:     East of Kuril Islands    2025.08.01-18:20:47.19    q:A      mb:5.5    Mwp:6.3*    Mwpd:-    Td*T50Ex:2.2     fmamp_polarity:./hypo.1754072447738.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1754072447738.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1754072447738.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: 5.5 [181]    Mwp: 6.3* [151]    Mwpd: 6.3Xinv [150]
Region: East of Kuril Islands
Origin Time: 2025.08.01-18:20:47.19 UTC
Hypocenter: lat: 50.06°  lon: 159.10°  [+/-14km]    depth: 9km  [+/-14km]
Location Quality: qualityCode:  A     stdErr: 1.6s   assocPhases: 363   usedPhases: 208
minDist: 3.0°   maxDist: 156.9°   AzGap: 21°   2ndAzGap: 30°   atten: -0.86 [+/-0.19]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 14km   azMaxHorUnc: 170°
68%ConfEllipsoid:   semiMajorAxisLength: 17km   majorAxisAzimuth: 345°   majorAxisPlunge: 13°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 250°   intermediateAxisPlunge: 21°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [167]    Td: 4.5s [27]    Td*T50Ex: 2.2 [27]    To: 22.5s [163]
Closest plate boundaries:
   Okhotsk / Pacific [subduction zone]: distance: ~10km
   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 (10km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   2.2
   2.2
   2.2
Td*To:
     101.2
     101.2
     101.2
Mwp magnitude:
       6.3*
       6.3*
       6.3*
Hypocenter depth:
       9km
       9km
       9km
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.1754072447738.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):
Nodal Plane 1: strike: 115°   dip: 51°   rake: -26°
Nodal Plane 2: strike: 222°   dip: 70°   rake: -138°
Quality: azimuthalGap: -1°   stationPolarityCount: 183   misfitWeightCount: 24.4   misfit: 0.15   stationDistributionRatio: 0.48   meanDistP: 19.7   meanDistT: 20.3   qualityCode: B
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1754072447738.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 81°   dip: 22°   rake: -58°
Nodal Plane 2: strike: 228°   dip: 72°   rake: -102°
Quality: azimuthalGap: -1°   stationPolarityCount: 62   misfitWeightCount: 7.8   misfit: 0.00   stationDistributionRatio: 0.57   meanDistP: 36.0   meanDistT: 44.4   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity_waveform
./hypo.1754072447738.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 356°   dip: 30°   rake: -125°
Nodal Plane 2: strike: 214°   dip: 66°   rake: -72°
Quality: azimuthalGap: 41°   stationPolarityCount: 182   misfit: 0.08   stationDistributionRatio: 0.67   rmsAngDiffAccPref: 29.75   fracAcc30degPref: 0.67   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1754072447738.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1754072447738
Event info last updated: 2025.08.01-19:19:05 UTC
Event first association/location: 2025.08.01-18:27:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA