Early-est:     Off East Coast of Honshu, Japan    2025.11.12-00:29:21.18    q:A      mb:5.2    Mwp:5.7    Mwpd:-    Td*T50Ex:1.3     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 [139]    Mwp: 5.7 [22]    Mwpd: 5.9Xinv [18] Region: Off East Coast of Honshu, Japan Origin Time: 2025.11.12-00:29:21.18 UTC Hypocenter: lat: 39.74°  lon: 143.28°  [+/-7km]    depth: 11km  [+/-6km] Location Quality: qualityCode:  A     stdErr: 1.2s   assocPhases: 190   usedPhases: 161 minDist: 2.0°   maxDist: 152.7°   AzGap: 65°   2ndAzGap: 84°   atten: -1.12 [+/-0.15] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 6km   maxHorUnc: 7km   azMaxHorUnc: 91° 68%ConfEllipsoid:   semiMajorAxisLength: 9km   majorAxisAzimuth: 270°   majorAxisPlunge: 14°   semiIntermediateAxisLength: 7km   intermediateAxisAzimuth: 179°   intermediateAxisPlunge: 3°   semiMinorAxisLength: 6km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.5 [124]    Td: 2.7s [7]    Td*T50Ex: 1.3 [7]    To: 18.8s [104] Closest plate boundaries:    Pacific \ Okhotsk [subduction zone]: distance: ~80km    Okhotsk / Pacific [subduction zone]: distance: ~160km 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 (80km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    1.3    1.3    1.3 Td*To:      50.8      50.8      50.8 Mwp magnitude:        5.7        5.7        5.7 Hypocenter depth:        11km        11km        11km Slab depth at epicenter:        19km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 11°   dip: 37°   rake: 145° Nodal Plane 2: strike: 131°   dip: 70°   rake: 59° Quality: azimuthalGap: -1°   stationPolarityCount: 143   misfitWeightCount: 17.6   misfit: 0.24   stationDistributionRatio: 0.52   meanDistP: 40.4   meanDistT: 29.5   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: 216°   dip: 31°   rake: 87° Nodal Plane 2: strike: 40°   dip: 59°   rake: 92° Quality: azimuthalGap: 64°   stationPolarityCount: 143   misfit: 0.31   stationDistributionRatio: 0.64   rmsAngDiffAccPref: 43.80   fracAcc30degPref: 0.37   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: 116°   dip: 46°   rake: -35° Nodal Plane 2: strike: 232°   dip: 66°   rake: -130° Quality: azimuthalGap: -1°   stationPolarityCount: 31   misfitWeightCount: 3.2   misfit: 9999.90   stationDistributionRatio: 0.35   meanDistP: 39.3   meanDistT: 38.1   qualityCode: D 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/1762907360660
Event info last updated: 2025.11.12-01:29:54 UTC
Event first association/location: 2025.11.12-00:33:06 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI