Early-est: Vanuatu Islands Region 2026.06.03-10:20:39.43 q:C mb:5.0 Mwp:5.7* Mwpd:- Td*T50Ex:2.3 fmamp_polarity: fmamp_polarity_waveform: hash:

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

Earthquake Details:
Magnitude:	mb: 5.0 [9] Mwp: 5.7* [6] Mwpd: 5.8Xinv [5]
Region:	Vanuatu Islands Region
Origin Time:	2026.06.03-10:20:39.43 UTC
Hypocenter:	lat: -20.12° lon: 172.99° [+/-31km] depth: 10km [+/-38km]
Location Quality:	qualityCode: C stdErr: 1.0s assocPhases: 10 usedPhases: 9 minDist: 4.9° maxDist: 58.0° AzGap: 176° 2ndAzGap: 283° atten: -1.21 [+/-0.15]
Location Uncertainty:	68%ConfEllipse: minHorUnc: 25km maxHorUnc: 31km azMaxHorUnc: 6° 68%ConfEllipsoid: semiMajorAxisLength: 43km majorAxisAzimuth: 339° majorAxisPlunge: 48° semiIntermediateAxisLength: 36km intermediateAxisAzimuth: 217° intermediateAxisPlunge: 25° semiMinorAxisLength: 27km

Tsunamigeneic Assesment:

Discriminants:

Prob Underwater: >99%
T50Ex: 0.4 [8] Td: 6.5s [5] Td*T50Ex: 2.3 [5] To: 12.6s [8]
Closest plate boundaries:
Conway Reef - New Hebrides [oceanic spreading ridge]: distance: ~40km
Subduction geometry: none or not available

Decision table (TEST!):

Event type:

Subduction Zone

Other Thrust/Normal

Strike-slip

Compatible close plate boundary?:

Prob underwater:

>99%

Td*T50Ex:

2.3

Td*To:

81.9

Mwp magnitude:

5.7*

Hypocenter depth:

10km

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)

First-motion Focal Mechanism (FMAMP_POLARITY): (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

./hypo.1780482039430.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.1780482039430.mech.fmamp_polarity_waveform.mechanism.jpg

First-motion Focal Mechanism (HASH): (No solution available)
Nodal Plane 1:	strike: 999° dip: 99° rake: 999°
Nodal Plane 2:	strike: 324° dip: 13° rake: 135°
Quality:	azimuthalGap: 103° stationPolarityCount: 7 misfit: 0.99 stationDistributionRatio: 0.64 rmsAngDiffAccPref: 25.48 fracAcc30degPref: 0.00 qualityCode: F
Method:	methodID: smi:gov.usgs/focalmec/HASH_1.2

./hypo.1780482039430.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1780482039430
Event info last updated: 2026.06.03-11:19:01 UTC
Event first association/location: 2026.06.03-11:12:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA

Early-est: Vanuatu Islands Region 2026.06.03-10:20:39.43 q:C mb:5.0 Mwp:5.7* Mwpd:- Td*T50Ex:2.3 fmamp_polarity: fmamp_polarity_waveform: hash:

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

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