Early-est:     Taiwan    2025.12.09-12:01:45.17    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: 4.4X [1]    Mwp: - [0]    Mwpd: - [0] Region: Taiwan Origin Time: 2025.12.09-12:01:45.17 UTC Hypocenter: lat: 23.07°  lon: 121.57°  [+/-13km]    depth: 62km  [+/-17km] Location Quality: qualityCode:  B     stdErr: 1.1s   assocPhases: 10   usedPhases: 7 minDist: 0.5°   maxDist: 138.1°   AzGap: 95°   2ndAzGap: 120°   atten: -9.90 [+/-0.00] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 13km   azMaxHorUnc: 154° 68%ConfEllipsoid:   semiMajorAxisLength: 17km   majorAxisAzimuth: 348°   majorAxisPlunge: 76°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 153°   intermediateAxisPlunge: 14°   semiMinorAxisLength: 13km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: - [0]    Td: -s [0]    Td*T50Ex: - [0]    To: -s [0] Closest plate boundaries:    Okinawa - Philippine Sea [oceanic transform fault]: distance: ~110km    Philippine Sea - Yangtze [continental convergent boundary]: distance: ~120km    Yangtze - Okinawa [continental rift boundary]: distance: ~180km    Yangtze - Sunda [continental convergent boundary]: distance: ~200km    Philippine Sea / Sunda [subduction zone]: distance: ~200km    Okinawa / Philippine Sea [subduction zone]: distance: ~410km Subduction geometry: none or not available Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (200km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        62km        62km        62km Slab depth at epicenter:        n/a        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (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/_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: 76°   stationPolarityCount: 7   misfit: 0.99   stationDistributionRatio: 0.24   rmsAngDiffAccPref: 31.58   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: 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/1765281705169
Event info last updated: 2025.12.09-13:01:50 UTC
Event first association/location: 2025.12.09-12:49:04 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI