Early-est:     East of Kuril Islands    2025.12.09-19:43:42.38    q:A      mb:5.2    Mwp:-    Mwpd:-    Td*T50Ex:-     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: 5.2 [103]    Mwp: 5.4X [1]    Mwpd: 5.6Xinv [1] Region: East of Kuril Islands Origin Time: 2025.12.09-19:43:42.38 UTC Hypocenter: lat: 50.51°  lon: 160.02°  [+/-15km]    depth: 10km  [+/-15km] Location Quality: qualityCode:  A     stdErr: 1.1s   assocPhases: 156   usedPhases: 119 minDist: 2.7°   maxDist: 157.5°   AzGap: 59°   2ndAzGap: 77°   atten: -1.04 [+/-0.21] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 15km   azMaxHorUnc: 145° 68%ConfEllipsoid:   semiMajorAxisLength: 19km   majorAxisAzimuth: 139°   majorAxisPlunge: 7°   semiIntermediateAxisLength: 18km   intermediateAxisAzimuth: 47°   intermediateAxisPlunge: 18°   semiMinorAxisLength: 14km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.4 [81]    Td: 1.0Xs [3]    Td*T50Ex: - [0]    To: 3.5s [70] Closest plate boundaries:    Okhotsk / Pacific [subduction zone]: distance: ~40km    North America / Pacific [subduction zone]: distance: ~590km    Okhotsk / North America [subduction zone]: distance: ~590km Subduction geometry: none or not available Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (40km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        10km        10km        10km Slab depth at epicenter:        n/a        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 158°   dip: 44°   rake: 71° Nodal Plane 2: strike: 3°   dip: 49°   rake: 107° Quality: azimuthalGap: -1°   stationPolarityCount: 109   misfitWeightCount: 12.3   misfit: 0.31   stationDistributionRatio: 0.32   meanDistP: 44.3   meanDistT: 29.5   qualityCode: D 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: 54°   dip: 76°   rake: 175° Nodal Plane 2: strike: 145°   dip: 85°   rake: 14° Quality: azimuthalGap: 76°   stationPolarityCount: 109   misfit: 0.40   stationDistributionRatio: 0.62   rmsAngDiffAccPref: 45.02   fracAcc30degPref: 0.48   qualityCode: D Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
First-motion Focal Mechanism (FMAMP_AMP_AREF):    (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/_amp_aref
First-motion Focal Mechanism (FMAMP_AMP_MWP):    (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/_amp_mwp

Event ID: smi:KOERI/ee/event/1765309421896
Event info last updated: 2025.12.09-20:44:05 UTC
Event first association/location: 2025.12.09-19:49:16 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI