Early-est:     Solomon Islands    2025.12.16-15:49:32.05    q:B      mb:4.5    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:     hash:     fmamp_amp_aref:     fmamp_amp_mwp:

Automatic solution - this event has not been reviewed by a seismologist
Automatically determined event information may be incorrect!

Earthquake Details: Magnitude: mb: 4.5 [13]    Mwp: - [0]    Mwpd: - [0] Region: Solomon Islands Origin Time: 2025.12.16-15:49:32.05 UTC Hypocenter: lat: -6.90°  lon: 155.62°  [+/-19km]    depth: 102km  [+/-24km] Location Quality: qualityCode:  B     stdErr: 1.5s   assocPhases: 42   usedPhases: 15 minDist: 4.4°   maxDist: 134.6°   AzGap: 157°   2ndAzGap: 224°   atten: -1.80 [+/-0.29] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 19km   azMaxHorUnc: 14° 68%ConfEllipsoid:   semiMajorAxisLength: 28km   majorAxisAzimuth: 12°   majorAxisPlunge: 47°   semiIntermediateAxisLength: 19km   intermediateAxisAzimuth: 203°   intermediateAxisPlunge: 43°   semiMinorAxisLength: 16km Tsunamigeneic Assesment: Discriminants: Prob Underwater: 86% T50Ex: 0.4 [8]    Td: 3.9Xs [1]    Td*T50Ex: - [0]    To: 1.9s [7] Closest plate boundaries:    Woodlark - Solomon Sea [oceanic transform fault]: distance: ~70km    Pacific / Solomon Sea [subduction zone]: distance: ~70km    Pacific / Woodlark [subduction zone]: distance: ~70km    Pacific - North Bismarck [oceanic convergent boundary]: distance: ~90km    North Bismarck / Solomon Sea [subduction zone]: distance: ~90km Subduction geometry:    Zone: Solomon Islands    Slab depth at epicenter: 35km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (70km)  YES (90km)  YES (70km) Prob underwater:  86%  86%  86% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        102km        102km        102km Slab depth at epicenter:        35km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 2°   dip: 30°   rake: 5° Nodal Plane 2: strike: 268°   dip: 88°   rake: 120° Quality: azimuthalGap: -1°   stationPolarityCount: 18   misfitWeightCount: 6.4   misfit: 0.07   stationDistributionRatio: 0.39   meanDistP: 26.1   meanDistT: 39.5   qualityCode: C Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 259°   dip: 89°   rake: 135° Nodal Plane 2: strike: 351°   dip: 45°   rake: 2° Quality: azimuthalGap: 146°   stationPolarityCount: 18   misfit: 0.29   stationDistributionRatio: 0.66   rmsAngDiffAccPref: 36.12   fracAcc30degPref: 0.55   qualityCode: D Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
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
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

Event ID: smi:KOERI/ee/event/1765900172469
Event info last updated: 2025.12.16-16:49:43 UTC
Event first association/location: 2025.12.16-15:56:19 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI