Early-est:     Kuril Islands    2026.08.12-10:47:49.73    q:C      mb:4.6*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1786531669603.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1786531669603.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1786531669603.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: 4.6* [25]    Mwp: - [0]    Mwpd: - [0]
Region: Kuril Islands
Origin Time: 2026.08.12-10:47:49.73 UTC
Hypocenter: lat: 46.31°  lon: 149.87°  [+/-12km]    depth: 137km  [+/-14km]
Location Quality: qualityCode:  C     stdErr: 1.8s   assocPhases: 54   usedPhases: 28
minDist: 6.4°   maxDist: 150.5°   AzGap: 83°   2ndAzGap: 127°   atten: -0.64 [+/-0.29]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 10km   maxHorUnc: 12km   azMaxHorUnc: 155°
68%ConfEllipsoid:   semiMajorAxisLength: 16km   majorAxisAzimuth: 163°   majorAxisPlunge: 41°   semiIntermediateAxisLength: 13km   intermediateAxisAzimuth: 311°   intermediateAxisPlunge: 44°   semiMinorAxisLength: 12km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0X [3]    Td: -s [0]    Td*T50Ex: - [0]    To: 2.1Xs [3]
Closest plate boundaries:
   Okhotsk / Pacific [subduction zone]: distance: ~220km
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 (220km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       137km
       137km
       137km
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.1786531669603.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 166°   dip: 66°   rake: -161°
Nodal Plane 2: strike: 68°   dip: 73°   rake: -25°
Quality: azimuthalGap: -1°   stationPolarityCount: 21   misfitWeightCount: 4.9   misfit: 0.05   stationDistributionRatio: 0.36   meanDistP: 53.3   meanDistT: 53.7   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1786531669603.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.1786531669603.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 222°   dip: 42°   rake: -77°
Nodal Plane 2: strike: 24°   dip: 50°   rake: -102°
Quality: azimuthalGap: 149°   stationPolarityCount: 21   misfit: 0.28   stationDistributionRatio: 0.72   rmsAngDiffAccPref: 40.34   fracAcc30degPref: 0.43   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1786531669603.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1786531669603
Event info last updated: 2026.08.12-11:46:01 UTC
Event first association/location: 2026.08.12-11:24:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA