Early-est:     Vanuatu Islands    2025.08.02-22:52:03.48    q:C      mb:4.7*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1754175118877.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1754175118877.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1754175118877.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: 4.7* [11]    Mwp: - [0]    Mwpd: - [0]
Region: Vanuatu Islands
Origin Time: 2025.08.02-22:52:03.48 UTC
Hypocenter: lat: -15.25°  lon: 167.70°  [+/-27km]    depth: 87km  [+/-54km]
Location Quality: qualityCode:  C     stdErr: 1.0s   assocPhases: 36   usedPhases: 10
minDist: 0.5°   maxDist: 145.2°   AzGap: 145°   2ndAzGap: 219°   atten: -1.54 [+/-0.21]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 27km   azMaxHorUnc: 152°
68%ConfEllipsoid:   semiMajorAxisLength: 61km   majorAxisAzimuth: 150°   majorAxisPlunge: 61°   semiIntermediateAxisLength: 18km   intermediateAxisAzimuth: 8°   intermediateAxisPlunge: 24°   semiMinorAxisLength: 17km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.6 [10]    Td: -s [0]    Td*T50Ex: - [0]    To: 11.2s [7]
Closest plate boundaries:
   New Hebrides / Australia [subduction zone]: distance: ~160km
   New Hebrides - Pacific [continental convergent boundary]: distance: ~190km
   Pacific / Australia [subduction zone]: distance: ~230km
Subduction geometry:    Zone: Santa Cruz Islands/Vanuatu/Loyalty Islands: DEBUG: error: [Errno 2] No such file or directory: 'gmt'    Slab depth at epicenter: error: evaluating slab depth: -999.9
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (160km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       87km
       87km
       87km
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.1754175118877.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 251°   dip: 37°   rake: -91°
Nodal Plane 2: strike: 72°   dip: 53°   rake: -89°
Quality: azimuthalGap: -1°   stationPolarityCount: 9   misfitWeightCount: 4.9   misfit: 0.07   stationDistributionRatio: 0.52   meanDistP: 46.7   meanDistT: 54.2   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1754175118877.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.1754175118877.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 72°   dip: 50°   rake: -96°
Nodal Plane 2: strike: 262°   dip: 40°   rake: -82°
Quality: azimuthalGap: 107°   stationPolarityCount: 9   misfit: 0.35   stationDistributionRatio: 0.53   rmsAngDiffAccPref: 51.54   fracAcc30degPref: 0.27   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1754175118877.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1754175118877
Event info last updated: 2025.08.02-23:51:00 UTC
Event first association/location: 2025.08.02-22:55:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA