Early-est:     Kuril Islands    2025.08.03-05:37:55.15    q:A      mb:5.6    Mwp:6.9*    Mwpd:-    Td*T50Ex:3.5     fmamp_polarity:./hypo.1754199479566.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1754199479566.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1754199479566.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: 5.6 [180]    Mwp: 6.9* [143]    Mwpd: 7.0Xinv [145]
Region: Kuril Islands
Origin Time: 2025.08.03-05:37:55.15 UTC
Hypocenter: lat: 50.59°  lon: 157.83°  [+/-14km]    depth: 15km  [+/-13km]
Location Quality: qualityCode:  A     stdErr: 1.3s   assocPhases: 338   usedPhases: 209
minDist: 2.5°   maxDist: 157.2°   AzGap: 45°   2ndAzGap: 51°   atten: -0.67 [+/-0.26]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 14km   azMaxHorUnc: 171°
68%ConfEllipsoid:   semiMajorAxisLength: 17km   majorAxisAzimuth: 352°   majorAxisPlunge: 4°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 83°   intermediateAxisPlunge: 16°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.6 [172]    Td: 5.8s [31]    Td*T50Ex: 3.5 [31]    To: 31.3s [170]
Closest plate boundaries:
   Okhotsk / Pacific [subduction zone]: distance: ~100km
   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 (100km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   3.5
   3.5
   3.5
Td*To:
     181.5
     181.5
     181.5
Mwp magnitude:
       6.9*
       6.9*
       6.9*
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.1754199479566.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 257°   dip: 41°   rake: -41°
Nodal Plane 2: strike: 20°   dip: 65°   rake: -123°
Quality: azimuthalGap: -1°   stationPolarityCount: 178   misfitWeightCount: 23.7   misfit: 0.10   stationDistributionRatio: 0.69   meanDistP: 38.8   meanDistT: 43.0   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1754199479566.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 157°   dip: 48°   rake: -118°
Nodal Plane 2: strike: 15°   dip: 49°   rake: -63°
Quality: azimuthalGap: -1°   stationPolarityCount: 61   misfitWeightCount: 7.6   misfit: 0.02   stationDistributionRatio: 0.67   meanDistP: 31.5   meanDistT: 46.3   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity_waveform
./hypo.1754199479566.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 224°   dip: 39°   rake: -81°
Nodal Plane 2: strike: 33°   dip: 52°   rake: -97°
Quality: azimuthalGap: 45°   stationPolarityCount: 178   misfit: 0.07   stationDistributionRatio: 0.69   rmsAngDiffAccPref: 40.29   fracAcc30degPref: 0.42   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1754199479566.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1754199479566
Event info last updated: 2025.08.03-06:36:14 UTC
Event first association/location: 2025.08.03-05:43:03 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA