Early-est:     Southwestern Ryukyu Isl., Japan    2025.01.31-09:10:21.87    q:B      mb:-    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: 4.8X [3]    Mwp: - [0]    Mwpd: - [0] Region: Southwestern Ryukyu Isl., Japan Origin Time: 2025.01.31-09:10:21.87 UTC Hypocenter: lat: 25.60°  lon: 125.20°  [+/-16km]    depth: 138km  [+/-29km] Location Quality: qualityCode:  B     stdErr: 0.7s   assocPhases: 10   usedPhases: 9 minDist: 1.5°   maxDist: 165.2°   AzGap: 84°   2ndAzGap: 136°   atten: -9.90 [+/-0.00] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 9km   maxHorUnc: 16km   azMaxHorUnc: 168° 68%ConfEllipsoid:   semiMajorAxisLength: 32km   majorAxisAzimuth: 168°   majorAxisPlunge: 64°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 347°   intermediateAxisPlunge: 26°   semiMinorAxisLength: 11km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.4X [2]    Td: -s [0]    Td*T50Ex: - [0]    To: 28.3Xs [1] Closest plate boundaries:    Yangtze - Okinawa [continental rift boundary]: distance: ~10km    Okinawa / Philippine Sea [subduction zone]: distance: ~240km Subduction geometry:    Zone: Ryukyu    Slab depth at epicenter: 102km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (240km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        138km        138km        138km Slab depth at epicenter:        102km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (No solution available) Nodal Plane 1: strike: 0°   dip: 0°   rake: nan° Nodal Plane 2: strike: nan°   dip: nan°   rake: nan° 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/_polarity
First-motion Focal Mechanism (HASH):    (No solution available) Nodal Plane 1: strike: 999°   dip: 99°   rake: 999° Nodal Plane 2: strike: 324°   dip: 13°   rake: 135° Quality: azimuthalGap: 0°   stationPolarityCount: 6   misfit: 0.99   stationDistributionRatio: 0.00   rmsAngDiffAccPref: 0.00   fracAcc30degPref: 0.00   qualityCode: F 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: nan° Nodal Plane 2: strike: nan°   dip: nan°   rake: nan° 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: nan° Nodal Plane 2: strike: nan°   dip: nan°   rake: nan° 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/1738314621873
Event info last updated: 2025.01.31-10:10:27 UTC
Event first association/location: 2025.01.31-10:00:44 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI