Early-est:     Bonin Islands, Japan Region    2023.03.10-12:57:34.79    q:A      mb:4.7    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: 4.7 [77]    Mwp: - [0]    Mwpd: - [0] Region: Bonin Islands, Japan Region Origin Time: 2023.03.10-12:57:34.79 UTC Hypocenter: lat: 28.33°  lon: 139.77°  [+/-7km]    depth: 454km  [+/-8km] Location Quality: qualityCode:  A     stdErr: 0.9s   assocPhases: 128   usedPhases: 96 minDist: 4.8°   maxDist: 137.1°   AzGap: 111°   2ndAzGap: 120°   atten: -1.23 [+/-0.18] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 7km   maxHorUnc: 7km   azMaxHorUnc: 114° 68%ConfEllipsoid:   semiMajorAxisLength: 9km   majorAxisAzimuth: 117°   majorAxisPlunge: 8°   semiIntermediateAxisLength: 9km   intermediateAxisAzimuth: 220°   intermediateAxisPlunge: 58°   semiMinorAxisLength: 8km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.0 [55]    Td: 0.6Xs [3]    Td*T50Ex: - [0]    To: 1.1s [42] Closest plate boundaries:    Philippine Sea / Pacific [subduction zone]: distance: ~300km Subduction geometry:    Zone: Izu-Bonin    Slab depth at epicenter: 373km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (300km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        454km        454km        454km Slab depth at epicenter:        373km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 26°   dip: 25°   rake: 131° Nodal Plane 2: strike: 162°   dip: 71°   rake: 73° Quality: azimuthalGap: -1°   stationPolarityCount: 83   misfitWeightCount: 22.6   misfit: 0.25   stationDistributionRatio: 0.56   meanDistP: 32.6   meanDistT: 20.1   qualityCode: C 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: 94°   dip: 58°   rake: 141° Nodal Plane 2: strike: 207°   dip: 58°   rake: 39° Quality: azimuthalGap: 40°   stationPolarityCount: 83   misfit: 0.33   stationDistributionRatio: 0.70   rmsAngDiffAccPref: 29.93   fracAcc30degPref: 0.75   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/1678453055790
Event info last updated: 2023.03.10-13:57:11 UTC
Event first association/location: 2023.03.10-13:04:14 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI