Early-est:     Vanuatu Islands    2026.03.30-08:44:12.35    q:B      mb:5.8    Mwp:7.1*    Mwpd:7.2    Td*T50Ex:4.8     fmamp_polarity:./hypo.1774860254041.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1774860254041.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1774860254041.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: 5.8 [84]    Mwp: 7.1* [77]    Mwpd: 7.2 [85]
Region: Vanuatu Islands
Origin Time: 2026.03.30-08:44:12.35 UTC
Hypocenter: lat: -15.36°  lon: 167.50°  [+/-23km]    depth: 161km  [+/-30km]
Location Quality: qualityCode:  B     stdErr: 1.2s   assocPhases: 414   usedPhases: 170
minDist: 6.1°   maxDist: 169.3°   AzGap: 28°   2ndAzGap: 53°   atten: -1.79 [+/-0.23]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 17km   maxHorUnc: 23km   azMaxHorUnc: 1°
68%ConfEllipsoid:   semiMajorAxisLength: 32km   majorAxisAzimuth: 138°   majorAxisPlunge: 61°   semiIntermediateAxisLength: 28km   intermediateAxisAzimuth: 13°   intermediateAxisPlunge: 18°   semiMinorAxisLength: 19km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.7 [92]    Td: 6.6s [40]    Td*T50Ex: 4.8 [40]    To: 35.8s [91]
Closest plate boundaries:
   New Hebrides / Australia [subduction zone]: distance: ~140km
   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 (140km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   4.8
   4.8
   4.8
Td*To:
     236.3
     236.3
     236.3
Mwp magnitude:
       7.1*
       7.1*
       7.1*
Hypocenter depth:
       161km
       161km
       161km
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.1774860254041.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):
Nodal Plane 1: strike: 19°   dip: 36°   rake: 99°
Nodal Plane 2: strike: 188°   dip: 54°   rake: 84°
Quality: azimuthalGap: -1°   stationPolarityCount: 122   misfitWeightCount: 26.4   misfit: 0.09   stationDistributionRatio: 0.59   meanDistP: 18.3   meanDistT: 11.4   qualityCode: A
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1774860254041.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 10°   dip: 34°   rake: 83°
Nodal Plane 2: strike: 198°   dip: 56°   rake: 95°
Quality: azimuthalGap: -1°   stationPolarityCount: 50   misfitWeightCount: 13.4   misfit: 0.07   stationDistributionRatio: 0.46   meanDistP: 46.1   meanDistT: 23.8   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity_waveform
./hypo.1774860254041.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 359°   dip: 38°   rake: 85°
Nodal Plane 2: strike: 185°   dip: 52°   rake: 94°
Quality: azimuthalGap: 28°   stationPolarityCount: 122   misfit: 0.17   stationDistributionRatio: 0.63   rmsAngDiffAccPref: 16.11   fracAcc30degPref: 0.98   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1774860254041.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1774860254041
Event info last updated: 2026.03.30-09:43:03 UTC
Event first association/location: 2026.03.30-08:48:06 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA