Early-est:     Taiwan    2025.12.08-11:24:57.32    q:A      mb:5.2    Mwp:5.3    Mwpd:-    Td*T50Ex:0.8     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: 5.2 [111]    Mwp: 5.3 [10]    Mwpd: 5.4Xinv [2] Region: Taiwan Origin Time: 2025.12.08-11:24:57.32 UTC Hypocenter: lat: 23.71°  lon: 121.77°  [+/-7km]    depth: 20km  [+/-11km] Location Quality: qualityCode:  A     stdErr: 1.4s   assocPhases: 170   usedPhases: 135 minDist: 1.1°   maxDist: 177.3°   AzGap: 45°   2ndAzGap: 67°   atten: -1.15 [+/-0.12] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 7km   maxHorUnc: 7km   azMaxHorUnc: 21° 68%ConfEllipsoid:   semiMajorAxisLength: 11km   majorAxisAzimuth: 314°   majorAxisPlunge: 77°   semiIntermediateAxisLength: 8km   intermediateAxisAzimuth: 211°   intermediateAxisPlunge: 3°   semiMinorAxisLength: 8km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.4 [82]    Td: 1.9s [18]    Td*T50Ex: 0.8 [18]    To: 3.2s [68] Closest plate boundaries:    Okinawa - Philippine Sea [oceanic transform fault]: distance: ~50km    Philippine Sea - Yangtze [continental transform fault]: distance: ~110km    Yangtze - Okinawa [continental rift boundary]: distance: ~110km Subduction geometry: none or not available Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  no  no  YES (50km) Prob underwater:  >99%  >99%  >99% Td*T50Ex:    0.8    0.8    0.8 Td*To:      6.1      6.1      6.1 Mwp magnitude:        5.3        5.3        5.3 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: 29°   dip: 51°   rake: -4° Nodal Plane 2: strike: 122°   dip: 87°   rake: -141° Quality: azimuthalGap: -1°   stationPolarityCount: 118   misfitWeightCount: 25.5   misfit: 0.15   stationDistributionRatio: 0.54   meanDistP: 18.0   meanDistT: 37.3   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: 7°   dip: 27°   rake: -26° Nodal Plane 2: strike: 121°   dip: 78°   rake: -115° Quality: azimuthalGap: 67°   stationPolarityCount: 118   misfit: 0.35   stationDistributionRatio: 0.69   rmsAngDiffAccPref: 29.29   fracAcc30degPref: 0.66   qualityCode: C Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
First-motion Focal Mechanism (FMAMP_AMP_AREF):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 66°   dip: 21°   rake: 43° Nodal Plane 2: strike: 295°   dip: 76°   rake: 106° Quality: azimuthalGap: -1°   stationPolarityCount: 15   misfitWeightCount: 6.6   misfit: 9999.90   stationDistributionRatio: 0.42   meanDistP: 28.3   meanDistT: 30.1   qualityCode: C 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/1765193096925
Event info last updated: 2025.12.08-12:25:08 UTC
Event first association/location: 2025.12.08-11:27:44 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI