Early-est:     Pacific - Antarctic Ridge    2025.08.03-04:57:16.33    q:C      mb:5.2*    Mwp:6.0    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1754197035614.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1754197035614.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1754197035614.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: 5.2* [41]    Mwp: 6.0 [6]    Mwpd: 6.2Xinv [4]
Region: Pacific - Antarctic Ridge
Origin Time: 2025.08.03-04:57:16.33 UTC
Hypocenter: lat: -55.19°  lon: -128.59°  [+/-40km]    depth: 15km  [+/-38km]
Location Quality: qualityCode:  C     stdErr: 2.6s   assocPhases: 117   usedPhases: 71
minDist: 31.3°   maxDist: 175.9°   AzGap: 44°   2ndAzGap: 66°   atten: -1.22 [+/-0.59]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 20km   maxHorUnc: 40km   azMaxHorUnc: 3°
68%ConfEllipsoid:   semiMajorAxisLength: 50km   majorAxisAzimuth: 185°   majorAxisPlunge: 12°   semiIntermediateAxisLength: 38km   intermediateAxisAzimuth: 316°   intermediateAxisPlunge: 72°   semiMinorAxisLength: 24km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [28]    Td: 5.5Xs [3]    Td*T50Ex: - [0]    To: 20.1s [25]
Closest plate boundaries:
   Pacific - Antarctica [oceanic transform fault]: distance: ~10km
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 (10km)
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       6.0
       6.0
       6.0
Hypocenter depth:
       15km
       15km
       15km
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.1754197035614.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 31°   dip: 53°   rake: -3°
Nodal Plane 2: strike: 122°   dip: 88°   rake: -143°
Quality: azimuthalGap: -1°   stationPolarityCount: 35   misfitWeightCount: 6.8   misfit: 0.19   stationDistributionRatio: 0.29   meanDistP: 53.5   meanDistT: 55.9   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1754197035614.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.1754197035614.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 300°   dip: 84°   rake: 169°
Nodal Plane 2: strike: 31°   dip: 79°   rake: 7°
Quality: azimuthalGap: 66°   stationPolarityCount: 35   misfit: 0.47   stationDistributionRatio: 0.47   rmsAngDiffAccPref: 47.74   fracAcc30degPref: 0.46   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1754197035614.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1754197035614
Event info last updated: 2025.08.03-05:56:05 UTC
Event first association/location: 2025.08.03-05:07:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA