Early-est:     Solomon Islands    2025.12.16-09:18:46.96    q:A      mb:5.2    Mwp:-    Mwpd:-    Td*T50Ex:0.7     fmamp_polarity:./hypo.1765876728884.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1765876728884.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1765876728884.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1765876728884.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: 5.2 [56]    Mwp: 5.6X [3]    Mwpd: 5.7Xinv [1]
Region: Solomon Islands
Origin Time: 2025.12.16-09:18:46.96 UTC
Hypocenter: lat: -11.62°  lon: 163.43°  [+/-18km]    depth: 12km  [+/-13km]
Location Quality: qualityCode:  A     stdErr: 1.2s   assocPhases: 121   usedPhases: 88
minDist: 4.1°   maxDist: 152.4°   AzGap: 32°   2ndAzGap: 63°   atten: -1.24 [+/-0.17]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 18km   azMaxHorUnc: 105°
68%ConfEllipsoid:   semiMajorAxisLength: 22km   majorAxisAzimuth: 285°   majorAxisPlunge: 10°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 194°   intermediateAxisPlunge: 5°   semiMinorAxisLength: 12km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [40]    Td: 1.9s [13]    Td*T50Ex: 0.7 [13]    To: 3.0s [30]
Closest plate boundaries:
   Pacific / Australia [oceanic transform fault]: distance: ~40km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 no
 no
 YES (40km)
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   0.7
   0.7
   0.7
Td*To:
     5.7
     5.7
     5.7
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       12km
       12km
       12km
Slab depth at epicenter:
       n/a
       -
       -
./hypo.1765876728884.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 272°   dip: 64°   rake: 8°
Nodal Plane 2: strike: 178°   dip: 82°   rake: 154°
Quality: azimuthalGap: -1°   stationPolarityCount: 80   misfitWeightCount: 15.4   misfit: 0.11   stationDistributionRatio: 0.45   meanDistP: 39.8   meanDistT: 38.7   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1765876728884.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 202°   dip: 84°   rake: 173°
Nodal Plane 2: strike: 292°   dip: 83°   rake: 6°
Quality: azimuthalGap: 32°   stationPolarityCount: 80   misfit: 0.30   stationDistributionRatio: 0.54   rmsAngDiffAccPref: 8.65   fracAcc30degPref: 1.00   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1765876728884.mech.hash.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_AREF):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 168°   dip: 38°   rake: -136°
Nodal Plane 2: strike: 41°   dip: 64°   rake: -60°
Quality: azimuthalGap: -1°   stationPolarityCount: 12   misfitWeightCount: 3.3   misfit: 9999.90   stationDistributionRatio: 0.26   meanDistP: 29.9   meanDistT: 42.6   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_amp_aref
./hypo.1765876728884.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.1765876728884.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1765876728884
Event info last updated: 2025.12.16-10:19:06 UTC
Event first association/location: 2025.12.16-09:23:50 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI