Early-est:     South of Fiji Islands    2026.10.11-07:28:53.97    q:B      mb:4.4    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1791703733425.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1791703733425.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1791703733425.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1791703733425.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 [21]    Mwp: - [0]    Mwpd: - [0]
Region: South of Fiji Islands
Origin Time: 2026.10.11-07:28:53.97 UTC
Hypocenter: lat: -23.83°  lon: 179.79°  [+/-17km]    depth: 509km  [+/-16km]
Location Quality: qualityCode:  B     stdErr: 1.4s   assocPhases: 43   usedPhases: 28
minDist: 6.3°   maxDist: 154.3°   AzGap: 139°   2ndAzGap: 199°   atten: -0.73 [+/-0.35]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 17km   azMaxHorUnc: 115°
68%ConfEllipsoid:   semiMajorAxisLength: 21km   majorAxisAzimuth: 293°   majorAxisPlunge: 14°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 190°   intermediateAxisPlunge: 43°   semiMinorAxisLength: 15km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [12]    Td: -s [0]    Td*T50Ex: - [0]    To: 0.8s [11]
Closest plate boundaries:
Subduction geometry:    Zone: Kermadec-Tonga    Slab depth at epicenter: 543km
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:
       509km
       509km
       509km
Slab depth at epicenter:
       543km
       -
       -
./hypo.1791703733425.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 4°   dip: 11°   rake: 22°
Nodal Plane 2: strike: 253°   dip: 86°   rake: 100°
Quality: azimuthalGap: -1°   stationPolarityCount: 25   misfitWeightCount: 6.2   misfit: 0.10   stationDistributionRatio: 0.34   meanDistP: 41.2   meanDistT: 39.2   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1791703733425.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 231°   dip: 71°   rake: 138°
Nodal Plane 2: strike: 338°   dip: 51°   rake: 25°
Quality: azimuthalGap: 120°   stationPolarityCount: 25   misfit: 0.20   stationDistributionRatio: 0.58   rmsAngDiffAccPref: 28.08   fracAcc30degPref: 0.70   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1791703733425.mech.hash.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_AREF):    (No solution available)
Nodal Plane 1: strike: 0°   dip: 0°   rake: nan°
Nodal Plane 2: strike: nan°   dip: nan°   rake: nan°
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.1791703733425.mech.fmamp_amp_aref.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_MWP):    (No solution available)
Nodal Plane 1: strike: 0°   dip: 0°   rake: nan°
Nodal Plane 2: strike: nan°   dip: nan°   rake: nan°
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.1791703733425.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1791703733425
Event info last updated: 2026.10.11-08:29:03 UTC
Event first association/location: 2026.10.11-07:39:02 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI