Early-est:     Hokkaido, Japan Region    2023.03.10-20:12:39.68    q:B      mb:5.0    Mwp:-    Mwpd:-    Td*T50Ex:0.3     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: 5.0 [73]    Mwp: - [0]    Mwpd: - [0] Region: Hokkaido, Japan Region Origin Time: 2023.03.10-20:12:39.68 UTC Hypocenter: lat: 42.10°  lon: 143.17°  [+/-19km]    depth: 54km  [+/-17km] Location Quality: qualityCode:  B     stdErr: 1.4s   assocPhases: 126   usedPhases: 94 minDist: 0.1°   maxDist: 148.2°   AzGap: 112°   2ndAzGap: 120°   atten: -1.10 [+/-0.35] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 19km   azMaxHorUnc: 118° 68%ConfEllipsoid:   semiMajorAxisLength: 23km   majorAxisAzimuth: 297°   majorAxisPlunge: 10°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 148°   intermediateAxisPlunge: 78°   semiMinorAxisLength: 16km Tsunamigeneic Assesment: Discriminants: Prob Underwater: 40% T50Ex: 0.4 [54]    Td: 0.7s [4]    Td*T50Ex: 0.3 [4]    To: 1.5s [40] Closest plate boundaries:    Pacific \ Okhotsk [subduction zone]: distance: ~170km    Okhotsk / Pacific [subduction zone]: distance: ~170km Subduction geometry:    Zone: Kamchatka/Kurils/Japan    Slab depth at epicenter: 46km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (170km)  no  no Prob underwater:  40%  40%  40% Td*T50Ex:    0.3    0.3    0.3 Td*To:      1.0      1.0      1.0 Mwp magnitude:        -        -        - Hypocenter depth:        54km        54km        54km Slab depth at epicenter:        46km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 94°   dip: 52°   rake: -36° Nodal Plane 2: strike: 208°   dip: 62°   rake: -135° Quality: azimuthalGap: -1°   stationPolarityCount: 81   misfitWeightCount: 15.9   misfit: 0.23   stationDistributionRatio: 0.41   meanDistP: 43.2   meanDistT: 35.3   qualityCode: D 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: 189°   dip: 66°   rake: -132° Nodal Plane 2: strike: 75°   dip: 47°   rake: -33° Quality: azimuthalGap: 111°   stationPolarityCount: 81   misfit: 0.25   stationDistributionRatio: 0.68   rmsAngDiffAccPref: 30.70   fracAcc30degPref: 0.71   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: 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_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/1678479162237
Event info last updated: 2023.03.10-21:12:52 UTC
Event first association/location: 2023.03.10-20:19:16 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI