Early-est:     Southwestern Ryukyu Isl., Japan    2025.01.26-16:31:50.11    q:B      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 [19]    Mwp: 4.9X [1]    Mwpd: - [0] Region: Southwestern Ryukyu Isl., Japan Origin Time: 2025.01.26-16:31:50.11 UTC Hypocenter: lat: 24.46°  lon: 125.41°  [+/-13km]    depth: 15km  [+/-14km] Location Quality: qualityCode:  B     stdErr: 1.5s   assocPhases: 49   usedPhases: 18 minDist: 1.1°   maxDist: 162.5°   AzGap: 90°   2ndAzGap: 122°   atten: -1.64 [+/-0.34] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 13km   azMaxHorUnc: 37° 68%ConfEllipsoid:   semiMajorAxisLength: 17km   majorAxisAzimuth: 220°   majorAxisPlunge: 8°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 313°   intermediateAxisPlunge: 19°   semiMinorAxisLength: 13km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.5 [14]    Td: -s [0]    Td*T50Ex: - [0]    To: 3.3s [11] Closest plate boundaries:    Yangtze - Okinawa [continental rift boundary]: distance: ~100km    Okinawa / Philippine Sea [subduction zone]: distance: ~120km    Okinawa - Philippine Sea [oceanic convergent boundary]: distance: ~120km Subduction geometry:    Zone: Ryukyu    Slab depth at epicenter: 34km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (120km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        15km        15km        15km Slab depth at epicenter:        34km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 347°   dip: 29°   rake: -37° Nodal Plane 2: strike: 110°   dip: 73°   rake: -114° Quality: azimuthalGap: -1°   stationPolarityCount: 21   misfitWeightCount: 8.1   misfit: 0.10   stationDistributionRatio: 0.53   meanDistP: 28.4   meanDistT: 45.1   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: 120°   dip: 87°   rake: -106° Nodal Plane 2: strike: 20°   dip: 17°   rake: -11° Quality: azimuthalGap: 122°   stationPolarityCount: 21   misfit: 0.34   stationDistributionRatio: 0.69   rmsAngDiffAccPref: 41.96   fracAcc30degPref: 0.43   qualityCode: D 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/1737909104661
Event info last updated: 2025.01.26-17:32:02 UTC
Event first association/location: 2025.01.26-16:33:44 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI