Early-est:     Kuril Islands    2026.10.06-16:48:22.08    q:A      mb:5.4    Mwp:6.0    Mwpd:-    Td*T50Ex:1.0     fmamp_polarity:     hash:     fmamp_amp_aref:     fmamp_amp_mwp:

Automatic solution - this event has not been reviewed by a seismologist
Automatically determined event information may be incorrect!

Earthquake Details: Magnitude: mb: 5.4 [171]    Mwp: 6.0 [68]    Mwpd: 6.0Xinv [62] Region: Kuril Islands Origin Time: 2026.10.06-16:48:22.08 UTC Hypocenter: lat: 48.19°  lon: 155.02°  [+/-17km]    depth: 17km  [+/-20km] Location Quality: qualityCode:  A     stdErr: 1.3s   assocPhases: 259   usedPhases: 231 minDist: 8.4°   maxDist: 153.5°   AzGap: 26°   2ndAzGap: 31°   atten: -0.76 [+/-0.15] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 17km   azMaxHorUnc: 125° 68%ConfEllipsoid:   semiMajorAxisLength: 23km   majorAxisAzimuth: 285°   majorAxisPlunge: 45°   semiIntermediateAxisLength: 19km   intermediateAxisAzimuth: 155°   intermediateAxisPlunge: 33°   semiMinorAxisLength: 14km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.3 [143]    Td: 2.9s [12]    Td*T50Ex: 1.0 [12]    To: 2.3s [130] Closest plate boundaries:    Okhotsk / Pacific [subduction zone]: distance: ~70km Subduction geometry:    Zone: Kamchatka/Kurils/Japan    Slab depth at epicenter: 22km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (70km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    1.0    1.0    1.0 Td*To:      6.7      6.7      6.7 Mwp magnitude:        6.0        6.0        6.0 Hypocenter depth:        17km        17km        17km Slab depth at epicenter:        22km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 201°   dip: 42°   rake: 81° Nodal Plane 2: strike: 34°   dip: 49°   rake: 98° Quality: azimuthalGap: -1°   stationPolarityCount: 209   misfitWeightCount: 22.5   misfit: 0.20   stationDistributionRatio: 0.53   meanDistP: 39.2   meanDistT: 21.4   qualityCode: C Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 66°   dip: 55°   rake: 84° Nodal Plane 2: strike: 256°   dip: 36°   rake: 98° Quality: azimuthalGap: 25°   stationPolarityCount: 209   misfit: 0.23   stationDistributionRatio: 0.62   rmsAngDiffAccPref: 41.66   fracAcc30degPref: 0.40   qualityCode: D Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
First-motion Focal Mechanism (FMAMP_AMP_AREF):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 253°   dip: 43°   rake: 57° Nodal Plane 2: strike: 115°   dip: 55°   rake: 117° Quality: azimuthalGap: -1°   stationPolarityCount: 67   misfitWeightCount: 9.3   misfit: 9999.90   stationDistributionRatio: 0.70   meanDistP: 41.8   meanDistT: 24.5   qualityCode: C Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_amp_aref
First-motion Focal Mechanism (FMAMP_AMP_MWP):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 166°   dip: 34°   rake: 89° Nodal Plane 2: strike: 348°   dip: 56°   rake: 91° Quality: azimuthalGap: -1°   stationPolarityCount: 61   misfitWeightCount: 8.2   misfit: 9999.90   stationDistributionRatio: 0.34   meanDistP: 43.5   meanDistT: 34.4   qualityCode: D Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_amp_mwp

Event ID: smi:KOERI/ee/event/1791305305227
Event info last updated: 2026.10.06-17:48:41 UTC
Event first association/location: 2026.10.06-16:53:35 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI