Early-est:     Kuril Islands    2025.12.14-10:50:27.42    q:B      mb:4.9    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: 4.9 [51]    Mwp: - [0]    Mwpd: - [0] Region: Kuril Islands Origin Time: 2025.12.14-10:50:27.42 UTC Hypocenter: lat: 49.41°  lon: 156.00°  [+/-14km]    depth: 88km  [+/-14km] Location Quality: qualityCode:  B     stdErr: 1.5s   assocPhases: 86   usedPhases: 62 minDist: 4.0°   maxDist: 146.6°   AzGap: 73°   2ndAzGap: 108°   atten: -0.99 [+/-0.18] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 14km   azMaxHorUnc: 6° 68%ConfEllipsoid:   semiMajorAxisLength: 17km   majorAxisAzimuth: 8°   majorAxisPlunge: 12°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 99°   intermediateAxisPlunge: 4°   semiMinorAxisLength: 14km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.0 [23]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.2s [21] Closest plate boundaries:    Okhotsk / Pacific [subduction zone]: distance: ~110km    North America / Pacific [subduction zone]: distance: ~850km    Okhotsk / North America [subduction zone]: distance: ~850km Subduction geometry:    Zone: Kamchatka/Kurils/Japan    Slab depth at epicenter: 37km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (110km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        88km        88km        88km Slab depth at epicenter:        37km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY): Nodal Plane 1: strike: 47°   dip: 5°   rake: 166° Nodal Plane 2: strike: 152°   dip: 89°   rake: 85° Quality: azimuthalGap: -1°   stationPolarityCount: 56   misfitWeightCount: 12.0   misfit: 0.15   stationDistributionRatio: 0.62   meanDistP: 21.3   meanDistT: 22.2   qualityCode: B Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 226°   dip: 14°   rake: -25° Nodal Plane 2: strike: 341°   dip: 84°   rake: -103° Quality: azimuthalGap: 108°   stationPolarityCount: 56   misfit: 0.26   stationDistributionRatio: 0.71   rmsAngDiffAccPref: 32.60   fracAcc30degPref: 0.68   qualityCode: C 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: nan° Nodal Plane 2: strike: nan°   dip: nan°   rake: nan° 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: nan° Nodal Plane 2: strike: nan°   dip: nan°   rake: nan° 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/1765709426778
Event info last updated: 2025.12.14-11:50:41 UTC
Event first association/location: 2025.12.14-10:58:02 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI