Early-est:     New Britain Region, P.N.G.    2026.10.04-11:09:48.26    q:B      mb:4.4    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: 4.4 [19]    Mwp: 5.4X [1]    Mwpd: 5.6Xinv [1] Region: New Britain Region, P.N.G. Origin Time: 2026.10.04-11:09:48.26 UTC Hypocenter: lat: -4.97°  lon: 151.50°  [+/-14km]    depth: 173km  [+/-14km] Location Quality: qualityCode:  B     stdErr: 0.7s   assocPhases: 49   usedPhases: 19 minDist: 1.0°   maxDist: 127.7°   AzGap: 83°   2ndAzGap: 96°   atten: -1.06 [+/-0.35] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 10km   maxHorUnc: 14km   azMaxHorUnc: 176° 68%ConfEllipsoid:   semiMajorAxisLength: 19km   majorAxisAzimuth: 354°   majorAxisPlunge: 28°   semiIntermediateAxisLength: 13km   intermediateAxisAzimuth: 223°   intermediateAxisPlunge: 51°   semiMinorAxisLength: 12km Tsunamigeneic Assesment: Discriminants: Prob Underwater: 13% T50Ex: 0.4 [12]    Td: 3.7Xs [2]    Td*T50Ex: - [0]    To: 1.3s [8] Closest plate boundaries:    South Bismarck / Solomon Sea [subduction zone]: distance: ~110km    North Bismarck - South Bismarck [continental transform fault]: distance: ~130km    Manus - South Bismarck [oceanic spreading ridge]: distance: ~140km    North Bismarck - Manus [oceanic convergent boundary]: distance: ~150km    North Bismarck / Solomon Sea [subduction zone]: distance: ~300km    Solomon Sea \ Woodlark [subduction zone]: distance: ~320km Subduction geometry:    Zone: Solomon Islands    Slab depth at epicenter: 89km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (110km)  no  no Prob underwater:  13%  13%  13% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        173km        173km        173km Slab depth at epicenter:        89km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 83°   dip: 31°   rake: 171° Nodal Plane 2: strike: 181°   dip: 85°   rake: 60° Quality: azimuthalGap: -1°   stationPolarityCount: 22   misfitWeightCount: 8.3   misfit: 0.11   stationDistributionRatio: 0.43   meanDistP: 31.9   meanDistT: 31.1   qualityCode: C Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 79°   dip: 32°   rake: 158° Nodal Plane 2: strike: 188°   dip: 78°   rake: 60° Quality: azimuthalGap: 91°   stationPolarityCount: 22   misfit: 0.25   stationDistributionRatio: 0.75   rmsAngDiffAccPref: 25.54   fracAcc30degPref: 0.84   qualityCode: C 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: 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
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

Event ID: smi:KOERI/ee/event/1791112189737
Event info last updated: 2026.10.04-12:09:50 UTC
Event first association/location: 2026.10.04-11:14:29 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI