Early-est:     Off East Coast of Kamchatka    2025.12.15-19:33:08.05    q:A      mb:5.4    Mwp:5.6    Mwpd:-    Td*T50Ex:1.1     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 [176]    Mwp: 5.6 [15]    Mwpd: 5.9Xinv [16] Region: Off East Coast of Kamchatka Origin Time: 2025.12.15-19:33:08.05 UTC Hypocenter: lat: 51.59°  lon: 161.18°  [+/-13km]    depth: 20km  [+/-12km] Location Quality: qualityCode:  A     stdErr: 1.4s   assocPhases: 270   usedPhases: 222 minDist: 2.1°   maxDist: 158.7°   AzGap: 27°   2ndAzGap: 51°   atten: -1.16 [+/-0.20] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 13km   azMaxHorUnc: 147° 68%ConfEllipsoid:   semiMajorAxisLength: 17km   majorAxisAzimuth: 327°   majorAxisPlunge: 0°   semiIntermediateAxisLength: 14km   intermediateAxisAzimuth: 237°   intermediateAxisPlunge: 8°   semiMinorAxisLength: 12km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.6 [169]    Td: 2.0s [13]    Td*T50Ex: 1.1 [13]    To: 36.7s [154] Closest plate boundaries:    Okhotsk / Pacific [subduction zone]: distance: ~40km    North America / Pacific [subduction zone]: distance: ~450km    Okhotsk / North America [subduction zone]: distance: ~450km 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:    1.1    1.1    1.1 Td*To:      73.4      73.4      73.4 Mwp magnitude:        5.6        5.6        5.6 Hypocenter depth:        20km        20km        20km Slab depth at epicenter:        n/a        -        -

First-motion Focal Mechanism (FMAMP_POLARITY): Nodal Plane 1: strike: 66°   dip: 25°   rake: 139° Nodal Plane 2: strike: 194°   dip: 74°   rake: 70° Quality: azimuthalGap: -1°   stationPolarityCount: 206   misfitWeightCount: 28.5   misfit: 0.20   stationDistributionRatio: 0.42   meanDistP: 16.7   meanDistT: 19.8   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: 191°   dip: 71°   rake: 97° Nodal Plane 2: strike: 350°   dip: 20°   rake: 71° Quality: azimuthalGap: 27°   stationPolarityCount: 206   misfit: 0.30   stationDistributionRatio: 0.62   rmsAngDiffAccPref: 30.91   fracAcc30degPref: 0.63   qualityCode: C 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: 77°   dip: 29°   rake: 148° Nodal Plane 2: strike: 196°   dip: 75°   rake: 65° Quality: azimuthalGap: -1°   stationPolarityCount: 26   misfitWeightCount: 6.9   misfit: 9999.90   stationDistributionRatio: 0.22   meanDistP: 25.7   meanDistT: 29.1   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: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 88°   dip: 46°   rake: 154° Nodal Plane 2: strike: 197°   dip: 71°   rake: 47° Quality: azimuthalGap: -1°   stationPolarityCount: 12   misfitWeightCount: 4.6   misfit: 9999.90   stationDistributionRatio: 0.25   meanDistP: 38.3   meanDistT: 28.6   qualityCode: C Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_amp_mwp

Event ID: smi:KOERI/ee/event/1765827189112
Event info last updated: 2025.12.15-20:33:46 UTC
Event first association/location: 2025.12.15-19:37:32 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI