Early-est:     Santa Cruz Islands    2025.06.04-15:27:48.10    q:B      mb:4.8    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1749050867399.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1749050867399.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1749050867399.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1749050867399.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: 4.8 [20]    Mwp: - [0]    Mwpd: - [0]
Region: Santa Cruz Islands
Origin Time: 2025.06.04-15:27:48.10 UTC
Hypocenter: lat: -11.89°  lon: 166.37°  [+/-15km]    depth: 32km  [+/-19km]
Location Quality: qualityCode:  B     stdErr: 1.3s   assocPhases: 57   usedPhases: 23
minDist: 3.6°   maxDist: 155.1°   AzGap: 92°   2ndAzGap: 142°   atten: -1.51 [+/-0.32]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 15km   azMaxHorUnc: 101°
68%ConfEllipsoid:   semiMajorAxisLength: 21km   majorAxisAzimuth: 270°   majorAxisPlunge: 46°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 129°   intermediateAxisPlunge: 36°   semiMinorAxisLength: 15km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [13]    Td: 0.9Xs [2]    Td*T50Ex: - [0]    To: 1.7s [10]
Closest plate boundaries:
   Pacific / Australia [subduction zone]: distance: ~80km
Subduction geometry:    Zone: Santa Cruz Islands/Vanuatu/Loyalty Islands    Slab depth at epicenter: 40km
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (80km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       32km
       32km
       32km
Slab depth at epicenter:
       40km
       -
       -
./hypo.1749050867399.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 123°   dip: 19°   rake: 124°
Nodal Plane 2: strike: 267°   dip: 74°   rake: 79°
Quality: azimuthalGap: -1°   stationPolarityCount: 19   misfitWeightCount: 5.3   misfit: 0.11   stationDistributionRatio: 0.53   meanDistP: 36.2   meanDistT: 30.4   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1749050867399.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: 184°   stationPolarityCount: 19   misfit: 0.99   stationDistributionRatio: 0.00   rmsAngDiffAccPref: 0.00   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1749050867399.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.1749050867399.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.1749050867399.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1749050867399
Event info last updated: 2025.06.04-16:27:55 UTC
Event first association/location: 2025.06.04-15:34:02 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI