Early-est:     Taiwan Region    2025.04.09-01:53:35.93    q:C      mb:-    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1744163609367.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1744163609367.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1744163609367.mech.hash.thumb.jpg

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

Earthquake Details:
Magnitude: mb: 4.5X [3]    Mwp: - [0]    Mwpd: 4.7Xinv [1]
Region: Taiwan Region
Origin Time: 2025.04.09-01:53:35.93 UTC
Hypocenter: lat: 24.55°  lon: 122.61°  [+/-47km]    depth: 62km  [+/-25km]
Location Quality: qualityCode:  C     stdErr: 0.8s   assocPhases: 35   usedPhases: 6
minDist: 0.4°   maxDist: 92.0°   AzGap: 134°   2ndAzGap: 159°   atten: 2.65 [+/-1.37]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 19km   maxHorUnc: 47km   azMaxHorUnc: 71°
68%ConfEllipsoid:   semiMajorAxisLength: 59km   majorAxisAzimuth: 251°   majorAxisPlunge: 7°   semiIntermediateAxisLength: 25km   intermediateAxisAzimuth: 153°   intermediateAxisPlunge: 47°   semiMinorAxisLength: 23km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.3 [9]    Td: 0.7Xs [1]    Td*T50Ex: - [0]    To: 10.1s [9]
Closest plate boundaries:
   Yangtze - Okinawa [continental rift boundary]: distance: ~60km
   Okinawa - Philippine Sea [oceanic transform fault]: distance: ~80km
   Philippine Sea - Yangtze [continental transform fault]: distance: ~110km
   Okinawa / Philippine Sea [subduction zone]: distance: ~330km
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 (80km)
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       62km
       62km
       62km
Slab depth at epicenter:
       n/a
       -
       -
Tsunami and Rupture predictions (TEST!): No prediction: Event too small (Mwp<7.0) or too few Mwp readings (N<20)
./hypo.1744163609367.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 33°   dip: 37°   rake: 149°
Nodal Plane 2: strike: 148°   dip: 72°   rake: 57°
Quality: azimuthalGap: -1°   stationPolarityCount: 19   misfitWeightCount: 4.2   misfit: 0.07   stationDistributionRatio: 0.50   meanDistP: 49.5   meanDistT: 44.5   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1744163609367.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (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_waveform
./hypo.1744163609367.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 104°   dip: 68°   rake: 111°
Nodal Plane 2: strike: 239°   dip: 30°   rake: 49°
Quality: azimuthalGap: 117°   stationPolarityCount: 19   misfit: 0.28   stationDistributionRatio: 0.77   rmsAngDiffAccPref: 40.20   fracAcc30degPref: 0.38   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1744163609367.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1744163609367
Event info last updated: 2025.04.09-02:52:00 UTC
Event first association/location: 2025.04.09-02:03:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA