Early-est:     Taiwan    2025.01.25-16:10:51.99    q:A      mb:4.9    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1737821453625.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1737821453625.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1737821453625.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1737821453625.mech.fmamp_amp_mwp.thumb.jpg

Automatic solution - this event has not been reviewed by a seismologist
Automatically determined event information may be incorrect!

Earthquake Details:
Magnitude: mb: 4.9 [37]    Mwp: 4.9X [2]    Mwpd: - [0]
Region: Taiwan
Origin Time: 2025.01.25-16:10:51.99 UTC
Hypocenter: lat: 22.59°  lon: 120.77°  [+/-7km]    depth: 20km  [+/-8km]
Location Quality: qualityCode:  A     stdErr: 1.3s   assocPhases: 67   usedPhases: 49
minDist: 0.4°   maxDist: 148.5°   AzGap: 65°   2ndAzGap: 92°   atten: -1.70 [+/-0.12]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 6km   maxHorUnc: 7km   azMaxHorUnc: 88°
68%ConfEllipsoid:   semiMajorAxisLength: 9km   majorAxisAzimuth: 266°   majorAxisPlunge: 31°   semiIntermediateAxisLength: 8km   intermediateAxisAzimuth: 97°   intermediateAxisPlunge: 58°   semiMinorAxisLength: 7km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.4 [28]    Td: 3.1Xs [1]    Td*T50Ex: - [0]    To: 2.0s [19]
Closest plate boundaries:
   Philippine Sea - Yangtze [continental convergent boundary]: distance: ~40km
   Yangtze - Sunda [continental convergent boundary]: distance: ~100km
   Philippine Sea / Sunda [subduction zone]: distance: ~110km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (110km)
 YES (40km)
 no
Prob underwater:
 <1%
 <1%
 <1%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       20km
       20km
       20km
Slab depth at epicenter:
       n/a
       -
       -
./hypo.1737821453625.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 326°   dip: 37°   rake: -111°
Nodal Plane 2: strike: 172°   dip: 56°   rake: -75°
Quality: azimuthalGap: -1°   stationPolarityCount: 43   misfitWeightCount: 9.0   misfit: 0.09   stationDistributionRatio: 0.68   meanDistP: 31.9   meanDistT: 34.9   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1737821453625.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 194°   dip: 50°   rake: -55°
Nodal Plane 2: strike: 325°   dip: 51°   rake: -125°
Quality: azimuthalGap: 106°   stationPolarityCount: 43   misfit: 0.26   stationDistributionRatio: 0.72   rmsAngDiffAccPref: 21.00   fracAcc30degPref: 0.94   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1737821453625.mech.hash.mechanism.jpg
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
./hypo.1737821453625.mech.fmamp_amp_aref.mechanism.jpg
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
./hypo.1737821453625.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1737821453625
Event info last updated: 2025.01.25-17:11:02 UTC
Event first association/location: 2025.01.25-16:16:24 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI