Early-est:     Fiji Islands Region    2025.01.27-19:24:40.29    q:B      mb:4.5    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1738005879994.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1738005879994.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1738005879994.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1738005879994.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: 4.5 [21]    Mwp: - [0]    Mwpd: - [0]
Region: Fiji Islands Region
Origin Time: 2025.01.27-19:24:40.29 UTC
Hypocenter: lat: -18.60°  lon: -177.93°  [+/-24km]    depth: 534km  [+/-50km]
Location Quality: qualityCode:  B     stdErr: 0.9s   assocPhases: 48   usedPhases: 24
minDist: 3.9°   maxDist: 86.3°   AzGap: 113°   2ndAzGap: 139°   atten: -1.71 [+/-0.16]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 24km   azMaxHorUnc: 64°
68%ConfEllipsoid:   semiMajorAxisLength: 56km   majorAxisAzimuth: 63°   majorAxisPlunge: 61°   semiIntermediateAxisLength: 18km   intermediateAxisAzimuth: 330°   intermediateAxisPlunge: 2°   semiMinorAxisLength: 15km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [10]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.0s [8]
Closest plate boundaries:
   Niuafo'ou - Australia [oceanic spreading ridge]: distance: ~140km
Subduction geometry:    Zone: Kermadec-Tonga    Slab depth at epicenter: 498km
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 no
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       534km
       534km
       534km
Slab depth at epicenter:
       498km
       -
       -
./hypo.1738005879994.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 90°   dip: 44°   rake: 116°
Nodal Plane 2: strike: 236°   dip: 52°   rake: 67°
Quality: azimuthalGap: -1°   stationPolarityCount: 22   misfitWeightCount: 6.4   misfit: 0.07   stationDistributionRatio: 0.52   meanDistP: 52.7   meanDistT: 28.8   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1738005879994.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 74°   dip: 49°   rake: 130°
Nodal Plane 2: strike: 202°   dip: 55°   rake: 54°
Quality: azimuthalGap: 113°   stationPolarityCount: 22   misfit: 0.09   stationDistributionRatio: 0.61   rmsAngDiffAccPref: 43.71   fracAcc30degPref: 0.43   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1738005879994.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.1738005879994.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.1738005879994.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1738005879994
Event info last updated: 2025.01.27-20:24:49 UTC
Event first association/location: 2025.01.27-19:31:02 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI