Early-est:     South of Fiji Islands    2025.01.31-10:29:50.31    q:B      mb:4.4    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1738319390252.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1738319390252.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1738319390252.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1738319390252.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 [20]    Mwp: - [0]    Mwpd: - [0]
Region: South of Fiji Islands
Origin Time: 2025.01.31-10:29:50.31 UTC
Hypocenter: lat: -25.05°  lon: -179.86°  [+/-17km]    depth: 508km  [+/-23km]
Location Quality: qualityCode:  B     stdErr: 0.8s   assocPhases: 24   usedPhases: 21
minDist: 13.0°   maxDist: 155.4°   AzGap: 139°   2ndAzGap: 154°   atten: -1.54 [+/-0.30]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 17km   azMaxHorUnc: 116°
68%ConfEllipsoid:   semiMajorAxisLength: 26km   majorAxisAzimuth: 102°   majorAxisPlunge: 54°   semiIntermediateAxisLength: 18km   intermediateAxisAzimuth: 324°   intermediateAxisPlunge: 28°   semiMinorAxisLength: 15km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [9]    Td: -s [0]    Td*T50Ex: - [0]    To: 0.9s [8]
Closest plate boundaries:
Subduction geometry:    Zone: Kermadec-Tonga    Slab depth at epicenter: 469km
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:
       508km
       508km
       508km
Slab depth at epicenter:
       469km
       -
       -
./hypo.1738319390252.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 126°   dip: 41°   rake: -87°
Nodal Plane 2: strike: 303°   dip: 49°   rake: -92°
Quality: azimuthalGap: -1°   stationPolarityCount: 20   misfitWeightCount: 6.3   misfit: 0.09   stationDistributionRatio: 0.55   meanDistP: 31.0   meanDistT: 37.5   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1738319390252.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 287°   dip: 38°   rake: -54°
Nodal Plane 2: strike: 64°   dip: 60°   rake: -115°
Quality: azimuthalGap: 139°   stationPolarityCount: 20   misfit: 0.26   stationDistributionRatio: 0.54   rmsAngDiffAccPref: 34.72   fracAcc30degPref: 0.64   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1738319390252.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.1738319390252.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.1738319390252.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1738319390252
Event info last updated: 2025.01.31-11:30:03 UTC
Event first association/location: 2025.01.31-10:36:13 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI