Early-est:     Ryukyu Islands, Japan    2025.02.03-19:15:00.58    q:A      mb:5.3    Mwp:-    Mwpd:-    Td*T50Ex:0.9     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: 5.3 [135]    Mwp: 5.5X [3]    Mwpd: 5.9Xinv [2] Region: Ryukyu Islands, Japan Origin Time: 2025.02.03-19:15:00.58 UTC Hypocenter: lat: 28.63°  lon: 130.90°  [+/-10km]    depth: 20km  [+/-10km] Location Quality: qualityCode:  A     stdErr: 1.4s   assocPhases: 198   usedPhases: 171 minDist: 2.8°   maxDist: 174.1°   AzGap: 33°   2ndAzGap: 38°   atten: -0.92 [+/-0.16] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 8km   maxHorUnc: 10km   azMaxHorUnc: 90° 68%ConfEllipsoid:   semiMajorAxisLength: 13km   majorAxisAzimuth: 89°   majorAxisPlunge: 13°   semiIntermediateAxisLength: 10km   intermediateAxisAzimuth: 357°   intermediateAxisPlunge: 8°   semiMinorAxisLength: 9km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.4 [119]    Td: 2.2s [5]    Td*T50Ex: 0.9 [5]    To: 31.7s [102] Closest plate boundaries:    Okinawa / Philippine Sea [subduction zone]: distance: ~40km    Yangtze - Okinawa [continental convergent boundary]: distance: ~200km    Amur / Philippine Sea [subduction zone]: distance: ~300km Subduction geometry: none or not available Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (40km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    0.9    0.9    0.9 Td*To:      69.7      69.7      69.7 Mwp magnitude:        -        -        - Hypocenter depth:        20km        20km        20km Slab depth at epicenter:        n/a        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 75°   dip: 52°   rake: -142° Nodal Plane 2: strike: 320°   dip: 61°   rake: -45° Quality: azimuthalGap: -1°   stationPolarityCount: 135   misfitWeightCount: 21.2   misfit: 0.23   stationDistributionRatio: 0.54   meanDistP: 24.7   meanDistT: 38.0   qualityCode: C 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: 67°   dip: 53°   rake: -153° Nodal Plane 2: strike: 320°   dip: 69°   rake: -41° Quality: azimuthalGap: 55°   stationPolarityCount: 135   misfit: 0.44   stationDistributionRatio: 0.66   rmsAngDiffAccPref: 42.06   fracAcc30degPref: 0.45   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: 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/1738610100424
Event info last updated: 2025.02.03-20:15:12 UTC
Event first association/location: 2025.02.03-19:17:46 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI