Early-est:     Northwest of Kuril Islands    2025.08.05-00:11:33.96    q:C      mb:4.5*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1754352701511.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1754352701511.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1754352701511.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: 4.5* [26]    Mwp: - [0]    Mwpd: - [0]
Region: Northwest of Kuril Islands
Origin Time: 2025.08.05-00:11:33.96 UTC
Hypocenter: lat: 51.34°  lon: 155.98°  [+/-52km]    depth: 192km  [+/-110km]
Location Quality: qualityCode:  C     stdErr: 1.7s   assocPhases: 56   usedPhases: 27
minDist: 17.8°   maxDist: 83.6°   AzGap: 98°   2ndAzGap: 193°   atten: -1.69 [+/-0.46]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 23km   maxHorUnc: 52km   azMaxHorUnc: 165°
68%ConfEllipsoid:   semiMajorAxisLength: 123km   majorAxisAzimuth: 346°   majorAxisPlunge: 62°   semiIntermediateAxisLength: 33km   intermediateAxisAzimuth: 159°   intermediateAxisPlunge: 27°   semiMinorAxisLength: 29km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [11]    Td: -s [0]    Td*T50Ex: - [0]    To: 2.6s [9]
Closest plate boundaries:
   Okhotsk / Pacific [subduction zone]: distance: ~250km
   North America / Pacific [subduction zone]: distance: ~690km
   Okhotsk / North America [subduction zone]: distance: ~690km
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 (250km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       192km
       192km
       192km
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.1754352701511.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 41°   dip: 18°   rake: 28°
Nodal Plane 2: strike: 284°   dip: 81°   rake: 106°
Quality: azimuthalGap: -1°   stationPolarityCount: 28   misfitWeightCount: 6.2   misfit: 0.11   stationDistributionRatio: 0.51   meanDistP: 39.4   meanDistT: 43.3   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1754352701511.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.1754352701511.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 54°   dip: 23°   rake: 28°
Nodal Plane 2: strike: 298°   dip: 80°   rake: 110°
Quality: azimuthalGap: 97°   stationPolarityCount: 28   misfit: 0.37   stationDistributionRatio: 0.75   rmsAngDiffAccPref: 27.17   fracAcc30degPref: 0.78   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1754352701511.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1754352701511
Event info last updated: 2025.08.05-01:10:00 UTC
Event first association/location: 2025.08.05-00:25:02 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA