Early-est:     Kuril Islands    2025.08.04-16:46:16.52    q:B      mb:5.2*    Mwp:-    Mwpd:-    Td*T50Ex:0.8     fmamp_polarity:./hypo.1754325981309.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1754325981309.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1754325981309.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* [57]    Mwp: 5.4X [3]    Mwpd: 5.5Xinv [3]
Region: Kuril Islands
Origin Time: 2025.08.04-16:46:16.52 UTC
Hypocenter: lat: 49.32°  lon: 156.10°  [+/-18km]    depth: 15km  [+/-23km]
Location Quality: qualityCode:  B     stdErr: 2.3s   assocPhases: 89   usedPhases: 65
minDist: 9.2°   maxDist: 146.5°   AzGap: 117°   2ndAzGap: 145°   atten: -0.94 [+/-0.23]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 18km   maxHorUnc: 18km   azMaxHorUnc: 127°
68%ConfEllipsoid:   semiMajorAxisLength: 26km   majorAxisAzimuth: 216°   majorAxisPlunge: 45°   semiIntermediateAxisLength: 23km   intermediateAxisAzimuth: 306°   intermediateAxisPlunge: 0°   semiMinorAxisLength: 19km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [52]    Td: 2.0s [6]    Td*T50Ex: 0.8 [6]    To: 13.1s [49]
Closest plate boundaries:
   Okhotsk / Pacific [subduction zone]: distance: ~100km
   North America / Pacific [subduction zone]: distance: ~850km
   Okhotsk / North America [subduction zone]: distance: ~850km
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 (100km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   0.8
   0.8
   0.8
Td*To:
     26.2
     26.2
     26.2
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       15km
       15km
       15km
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.1754325981309.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 95°   dip: 18°   rake: 14°
Nodal Plane 2: strike: 352°   dip: 86°   rake: 108°
Quality: azimuthalGap: -1°   stationPolarityCount: 55   misfitWeightCount: 9.2   misfit: 0.04   stationDistributionRatio: 0.50   meanDistP: 40.0   meanDistT: 32.4   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1754325981309.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.1754325981309.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 105°   dip: 27°   rake: 36°
Nodal Plane 2: strike: 342°   dip: 75°   rake: 112°
Quality: azimuthalGap: 145°   stationPolarityCount: 55   misfit: 0.21   stationDistributionRatio: 0.68   rmsAngDiffAccPref: 31.06   fracAcc30degPref: 0.65   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1754325981309.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1754325981309
Event info last updated: 2025.08.04-17:45:01 UTC
Event first association/location: 2025.08.04-16:53:02 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA