Early-est:     Off East Coast of Honshu, Japan    2025.11.10-03:00:20.19    q:A      mb:5.2    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: 5.2 [129]    Mwp: 5.6 [12]    Mwpd: 6.1Xinv [6] Region: Off East Coast of Honshu, Japan Origin Time: 2025.11.10-03:00:20.19 UTC Hypocenter: lat: 39.10°  lon: 143.12°  [+/-7km]    depth: 10km  [+/-7km] Location Quality: qualityCode:  A     stdErr: 1.1s   assocPhases: 186   usedPhases: 154 minDist: 2.3°   maxDist: 160.4°   AzGap: 26°   2ndAzGap: 34°   atten: -1.19 [+/-0.16] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 7km   maxHorUnc: 7km   azMaxHorUnc: 68° 68%ConfEllipsoid:   semiMajorAxisLength: 9km   majorAxisAzimuth: 69°   majorAxisPlunge: 8°   semiIntermediateAxisLength: 8km   intermediateAxisAzimuth: 160°   intermediateAxisPlunge: 3°   semiMinorAxisLength: 7km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.5 [98]    Td: 2.0s [8]    Td*T50Ex: 1.1 [8]    To: 23.5s [86] Closest plate boundaries:    Pacific \ Okhotsk [subduction zone]: distance: ~90km    Okhotsk / Pacific [subduction zone]: distance: ~220km Subduction geometry:    Zone: Kamchatka/Kurils/Japan    Slab depth at epicenter: 19km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (90km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    1.1    1.1    1.1 Td*To:      47.0      47.0      47.0 Mwp magnitude:        5.6        5.6        5.6 Hypocenter depth:        10km        10km        10km Slab depth at epicenter:        19km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY): Nodal Plane 1: strike: 84°   dip: 17°   rake: -33° Nodal Plane 2: strike: 206°   dip: 81°   rake: -104° Quality: azimuthalGap: -1°   stationPolarityCount: 134   misfitWeightCount: 20.1   misfit: 0.18   stationDistributionRatio: 0.36   meanDistP: 21.8   meanDistT: 17.3   qualityCode: B 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: 214°   dip: 87°   rake: -92° Nodal Plane 2: strike: 75°   dip: 3°   rake: -48° Quality: azimuthalGap: 33°   stationPolarityCount: 134   misfit: 0.24   stationDistributionRatio: 0.61   rmsAngDiffAccPref: 35.30   fracAcc30degPref: 0.54   qualityCode: D Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
First-motion Focal Mechanism (FMAMP_AMP_AREF):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 30°   dip: 48°   rake: 134° Nodal Plane 2: strike: 155°   dip: 57°   rake: 53° Quality: azimuthalGap: -1°   stationPolarityCount: 21   misfitWeightCount: 3.7   misfit: 9999.90   stationDistributionRatio: 0.23   meanDistP: 45.0   meanDistT: 29.8   qualityCode: D Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_amp_aref
First-motion Focal Mechanism (FMAMP_AMP_MWP):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 147°   dip: 51°   rake: 44° Nodal Plane 2: strike: 25°   dip: 57°   rake: 131° Quality: azimuthalGap: -1°   stationPolarityCount: 11   misfitWeightCount: 5.6   misfit: 9999.90   stationDistributionRatio: 0.47   meanDistP: 47.2   meanDistT: 34.1   qualityCode: D Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_amp_mwp

Event ID: smi:KOERI/ee/event/1762743620309
Event info last updated: 2025.11.10-03:59:21 UTC
Event first association/location: 2025.11.10-03:04:59 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI