Early-est:     Vanuatu Islands    2025.02.03-05:07:03.60    q:B      mb:4.4    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1738559223605.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1738559223605.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1738559223605.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1738559223605.mech.fmamp_amp_mwp.thumb.jpg

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

Earthquake Details:
Magnitude: mb: 4.4 [15]    Mwp: - [0]    Mwpd: - [0]
Region: Vanuatu Islands
Origin Time: 2025.02.03-05:07:03.60 UTC
Hypocenter: lat: -15.46°  lon: 167.19°  [+/-19km]    depth: 188km  [+/-19km]
Location Quality: qualityCode:  B     stdErr: 1.2s   assocPhases: 21   usedPhases: 19
minDist: 0.0°   maxDist: 149.1°   AzGap: 145°   2ndAzGap: 168°   atten: -0.73 [+/-0.32]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 15km   maxHorUnc: 19km   azMaxHorUnc: 38°
68%ConfEllipsoid:   semiMajorAxisLength: 24km   majorAxisAzimuth: 46°   majorAxisPlunge: 21°   semiIntermediateAxisLength: 21km   intermediateAxisAzimuth: 155°   intermediateAxisPlunge: 41°   semiMinorAxisLength: 16km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: 49%
T50Ex: 0.0 [7]    Td: -s [0]    Td*T50Ex: - [0]    To: 0.9s [5]
Closest plate boundaries:
   New Hebrides / Australia [subduction zone]: distance: ~100km
Subduction geometry:    Zone: Santa Cruz Islands/Vanuatu/Loyalty Islands    Slab depth at epicenter: 57km
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (100km)
 no
 no
Prob underwater:
 49%
 49%
 49%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       188km
       188km
       188km
Slab depth at epicenter:
       57km
       -
       -
./hypo.1738559223605.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 102°   dip: 31°   rake: -32°
Nodal Plane 2: strike: 221°   dip: 74°   rake: -117°
Quality: azimuthalGap: -1°   stationPolarityCount: 17   misfitWeightCount: 4.1   misfit: 0.12   stationDistributionRatio: 0.35   meanDistP: 47.0   meanDistT: 48.7   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1738559223605.mech.fmamp_polarity.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: 203°   stationPolarityCount: 17   misfit: 0.99   stationDistributionRatio: 0.35   rmsAngDiffAccPref: 31.44   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1738559223605.mech.hash.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_AREF):    (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/_amp_aref
./hypo.1738559223605.mech.fmamp_amp_aref.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_MWP):    (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/_amp_mwp
./hypo.1738559223605.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1738559223605
Event info last updated: 2025.02.03-06:07:19 UTC
Event first association/location: 2025.02.03-05:21:02 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI