Early-est:     Taiwan Region    2025.01.27-00:18:53.00    q:B      mb:4.8    Mwp:5.3    Mwpd:-    Td*T50Ex:1.0     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: 4.8 [33]    Mwp: 5.3 [4]    Mwpd: 5.5Xinv [2] Region: Taiwan Region Origin Time: 2025.01.27-00:18:53.00 UTC Hypocenter: lat: 22.77°  lon: 121.20°  [+/-14km]    depth: 10km  [+/-13km] Location Quality: qualityCode:  B     stdErr: 2.2s   assocPhases: 84   usedPhases: 47 minDist: 0.1°   maxDist: 148.1°   AzGap: 99°   2ndAzGap: 103°   atten: -1.01 [+/-0.26] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 14km   azMaxHorUnc: 102° 68%ConfEllipsoid:   semiMajorAxisLength: 17km   majorAxisAzimuth: 283°   majorAxisPlunge: 6°   semiIntermediateAxisLength: 14km   intermediateAxisAzimuth: 16°   intermediateAxisPlunge: 29°   semiMinorAxisLength: 13km Tsunamigeneic Assesment: Discriminants: Prob Underwater: 88% T50Ex: 0.4 [25]    Td: 2.3s [5]    Td*T50Ex: 1.0 [5]    To: 7.8s [21] Closest plate boundaries:    Philippine Sea - Yangtze [continental convergent boundary]: distance: ~90km    Yangtze - Sunda [continental convergent boundary]: distance: ~150km    Philippine Sea / Sunda [subduction zone]: distance: ~150km    Okinawa - Philippine Sea [oceanic transform fault]: distance: ~160km Subduction geometry: none or not available Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (150km)  YES (90km)  no Prob underwater:  88%  88%  88% Td*T50Ex:    1.0    1.0    1.0 Td*To:      17.9      17.9      17.9 Mwp magnitude:        5.3        5.3        5.3 Hypocenter depth:        10km        10km        10km Slab depth at epicenter:        n/a        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 133°   dip: 66°   rake: -176° Nodal Plane 2: strike: 41°   dip: 86°   rake: -25° Quality: azimuthalGap: -1°   stationPolarityCount: 47   misfitWeightCount: 10.6   misfit: 0.12   stationDistributionRatio: 0.44   meanDistP: 25.8   meanDistT: 47.0   qualityCode: D 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: 95°   dip: 90°   rake: -133° Nodal Plane 2: strike: 5°   dip: 43°   rake: -0° Quality: azimuthalGap: 89°   stationPolarityCount: 47   misfit: 0.28   stationDistributionRatio: 0.62   rmsAngDiffAccPref: 33.08   fracAcc30degPref: 0.64   qualityCode: C 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/1737937132462
Event info last updated: 2025.01.27-01:19:02 UTC
Event first association/location: 2025.01.27-00:26:48 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI