Early-est:     E. Russia - N.E. China Border Reg.    2025.12.16-14:38:43.37    q:B      mb:4.5    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: 4.5 [43]    Mwp: - [0]    Mwpd: - [0] Region: E. Russia - N.E. China Border Reg. Origin Time: 2025.12.16-14:38:43.37 UTC Hypocenter: lat: 42.42°  lon: 130.97°  [+/-16km]    depth: 573km  [+/-21km] Location Quality: qualityCode:  B     stdErr: 0.8s   assocPhases: 82   usedPhases: 53 minDist: 2.4°   maxDist: 144.3°   AzGap: 78°   2ndAzGap: 82°   atten: -0.91 [+/-0.22] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 16km   azMaxHorUnc: 73° 68%ConfEllipsoid:   semiMajorAxisLength: 23km   majorAxisAzimuth: 114°   majorAxisPlunge: 59°   semiIntermediateAxisLength: 19km   intermediateAxisAzimuth: 225°   intermediateAxisPlunge: 12°   semiMinorAxisLength: 16km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.0 [23]    Td: -s [0]    Td*T50Ex: - [0]    To: 0.9s [17] Closest plate boundaries: Subduction geometry:    Zone: Kamchatka/Kurils/Japan    Slab depth at epicenter: 557km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  no  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        573km        573km        573km Slab depth at epicenter:        557km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 222°   dip: 51°   rake: 25° Nodal Plane 2: strike: 115°   dip: 71°   rake: 138° Quality: azimuthalGap: -1°   stationPolarityCount: 47   misfitWeightCount: 15.0   misfit: 0.22   stationDistributionRatio: 0.49   meanDistP: 56.8   meanDistT: 27.2   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: 185°   dip: 26°   rake: -82° Nodal Plane 2: strike: 356°   dip: 65°   rake: -94° Quality: azimuthalGap: 104°   stationPolarityCount: 47   misfit: 0.34   stationDistributionRatio: 0.68   rmsAngDiffAccPref: 48.94   fracAcc30degPref: 0.44   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: 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/1765895923217
Event info last updated: 2025.12.16-15:38:51 UTC
Event first association/location: 2025.12.16-14:44:03 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI