Early-est:     Fiji Islands Region    2025.12.15-07:43:59.53    q:A      mb:4.7    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1765784639580.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1765784639580.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1765784639580.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1765784639580.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: 4.7 [43]    Mwp: - [0]    Mwpd: - [0]
Region: Fiji Islands Region
Origin Time: 2025.12.15-07:43:59.53 UTC
Hypocenter: lat: -20.71°  lon: -178.48°  [+/-19km]    depth: 609km  [+/-17km]
Location Quality: qualityCode:  A     stdErr: 0.9s   assocPhases: 99   usedPhases: 77
minDist: 4.4°   maxDist: 155.4°   AzGap: 39°   2ndAzGap: 62°   atten: -1.00 [+/-0.19]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 19km   azMaxHorUnc: 149°
68%ConfEllipsoid:   semiMajorAxisLength: 23km   majorAxisAzimuth: 149°   majorAxisPlunge: 3°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 304°   intermediateAxisPlunge: 87°   semiMinorAxisLength: 17km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [21]    Td: -s [0]    Td*T50Ex: - [0]    To: 0.9s [15]
Closest plate boundaries:
Subduction geometry:    Zone: Kermadec-Tonga    Slab depth at epicenter: 562km
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:
       609km
       609km
       609km
Slab depth at epicenter:
       562km
       -
       -
./hypo.1765784639580.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):
Nodal Plane 1: strike: 149°   dip: 48°   rake: -13°
Nodal Plane 2: strike: 248°   dip: 81°   rake: -138°
Quality: azimuthalGap: -1°   stationPolarityCount: 58   misfitWeightCount: 17.8   misfit: 0.14   stationDistributionRatio: 0.50   meanDistP: 17.5   meanDistT: 15.3   qualityCode: B
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1765784639580.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 73°   dip: 90°   rake: 146°
Nodal Plane 2: strike: 163°   dip: 56°   rake: 0°
Quality: azimuthalGap: 66°   stationPolarityCount: 58   misfit: 0.31   stationDistributionRatio: 0.59   rmsAngDiffAccPref: 9.43   fracAcc30degPref: 1.00   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1765784639580.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.1765784639580.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.1765784639580.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1765784639580
Event info last updated: 2025.12.15-08:44:07 UTC
Event first association/location: 2025.12.15-07:48:14 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI