Early-est:     Vanuatu Islands    2026.04.02-23:22:13.51    q:A      mb:5.2    Mwp:5.6*    Mwpd:-    Td*T50Ex:0.0     fmamp_polarity:./hypo.1775172128526.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1775172128526.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1775172128526.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 [44]    Mwp: 5.6* [7]    Mwpd: 5.7Xinv [4]
Region: Vanuatu Islands
Origin Time: 2026.04.02-23:22:13.51 UTC
Hypocenter: lat: -18.97°  lon: 169.57°  [+/-15km]    depth: 259km  [+/-13km]
Location Quality: qualityCode:  A     stdErr: 1.0s   assocPhases: 125   usedPhases: 91
minDist: 2.9°   maxDist: 160.0°   AzGap: 74°   2ndAzGap: 85°   atten: -1.54 [+/-0.19]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 15km   azMaxHorUnc: 83°
68%ConfEllipsoid:   semiMajorAxisLength: 19km   majorAxisAzimuth: 263°   majorAxisPlunge: 8°   semiIntermediateAxisLength: 14km   intermediateAxisAzimuth: 171°   intermediateAxisPlunge: 11°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [36]    Td: 1.2s [6]    Td*T50Ex: 0.0 [6]    To: 1.6s [36]
Closest plate boundaries:
   New Hebrides / Australia [subduction zone]: distance: ~190km
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 (190km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   0.0
   0.0
   0.0
Td*To:
     1.9
     1.9
     1.9
Mwp magnitude:
       5.6*
       5.6*
       5.6*
Hypocenter depth:
       259km
       259km
       259km
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.1775172128526.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):
Nodal Plane 1: strike: 59°   dip: 77°   rake: 168°
Nodal Plane 2: strike: 152°   dip: 78°   rake: 13°
Quality: azimuthalGap: -1°   stationPolarityCount: 44   misfitWeightCount: 14.8   misfit: 0.11   stationDistributionRatio: 0.50   meanDistP: 22.3   meanDistT: 28.3   qualityCode: B
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1775172128526.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.1775172128526.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 57°   dip: 76°   rake: 171°
Nodal Plane 2: strike: 149°   dip: 81°   rake: 14°
Quality: azimuthalGap: 74°   stationPolarityCount: 44   misfit: 0.24   stationDistributionRatio: 0.61   rmsAngDiffAccPref: 11.55   fracAcc30degPref: 1.00   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1775172128526.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1775172128526
Event info last updated: 2026.04.03-00:21:00 UTC
Event first association/location: 2026.04.02-23:24:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA