Early-est:     Kuril Islands    2025.12.07-17:16:36.71    q:B      mb:4.7    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: 4.7 [26]    Mwp: - [0]    Mwpd: - [0] Region: Kuril Islands Origin Time: 2025.12.07-17:16:36.71 UTC Hypocenter: lat: 50.34°  lon: 157.06°  [+/-15km]    depth: 19km  [+/-24km] Location Quality: qualityCode:  B     stdErr: 1.6s   assocPhases: 63   usedPhases: 30 minDist: 2.9°   maxDist: 149.9°   AzGap: 125°   2ndAzGap: 140°   atten: -1.10 [+/-0.18] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 15km   azMaxHorUnc: 168° 68%ConfEllipsoid:   semiMajorAxisLength: 25km   majorAxisAzimuth: 335°   majorAxisPlunge: 68°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 194°   intermediateAxisPlunge: 17°   semiMinorAxisLength: 16km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.4 [13]    Td: -s [0]    Td*T50Ex: - [0]    To: 5.4s [7] Closest plate boundaries:    Okhotsk / Pacific [subduction zone]: distance: ~120km    North America / Pacific [subduction zone]: distance: ~720km    Okhotsk / North America [subduction zone]: distance: ~720km Subduction geometry:    Zone: Kamchatka/Kurils/Japan    Slab depth at epicenter: 39km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (120km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        19km        19km        19km Slab depth at epicenter:        39km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 84°   dip: 23°   rake: -112° Nodal Plane 2: strike: 287°   dip: 68°   rake: -81° Quality: azimuthalGap: -1°   stationPolarityCount: 24   misfitWeightCount: 5.4   misfit: 0.12   stationDistributionRatio: 0.58   meanDistP: 33.7   meanDistT: 39.9   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: 15°   dip: 25°   rake: 177° Nodal Plane 2: strike: 108°   dip: 89°   rake: 66° Quality: azimuthalGap: 125°   stationPolarityCount: 24   misfit: 0.33   stationDistributionRatio: 0.65   rmsAngDiffAccPref: 38.18   fracAcc30degPref: 0.46   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/1765127799383
Event info last updated: 2025.12.07-18:16:46 UTC
Event first association/location: 2025.12.07-17:26:08 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI