Early-est:     New Britain Region, P.N.G.    2025.12.10-08:10:24.77    q:B      mb:4.2    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: 4.2 [8]    Mwp: - [0]    Mwpd: - [0] Region: New Britain Region, P.N.G. Origin Time: 2025.12.10-08:10:24.77 UTC Hypocenter: lat: -5.10°  lon: 149.67°  [+/-13km]    depth: 393km  [+/-16km] Location Quality: qualityCode:  B     stdErr: 0.8s   assocPhases: 16   usedPhases: 14 minDist: 3.8°   maxDist: 82.2°   AzGap: 144°   2ndAzGap: 183°   atten: -1.33 [+/-0.31] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 13km   azMaxHorUnc: 53° 68%ConfEllipsoid:   semiMajorAxisLength: 17km   majorAxisAzimuth: 236°   majorAxisPlunge: 29°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 351°   intermediateAxisPlunge: 37°   semiMinorAxisLength: 15km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.4 [4]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.1Xs [2] Closest plate boundaries:    Manus - South Bismarck [oceanic transform fault]: distance: ~150km    North Bismarck - South Bismarck [oceanic transform fault]: distance: ~170km    North Bismarck - Manus [oceanic spreading ridge]: distance: ~170km    South Bismarck / Solomon Sea [subduction zone]: distance: ~200km    Solomon Sea \ Woodlark [subduction zone]: distance: ~280km Subduction geometry:    Zone: Solomon Islands    Slab depth at epicenter: 276km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (200km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        393km        393km        393km Slab depth at epicenter:        276km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 347°   dip: 53°   rake: 136° Nodal Plane 2: strike: 107°   dip: 56°   rake: 46° Quality: azimuthalGap: -1°   stationPolarityCount: 12   misfitWeightCount: 4.6   misfit: 0.03   stationDistributionRatio: 0.53   meanDistP: 39.3   meanDistT: 38.2   qualityCode: D Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
First-motion Focal Mechanism (HASH): Nodal Plane 1: strike: 1°   dip: 49°   rake: 140° Nodal Plane 2: strike: 120°   dip: 61°   rake: 48° Quality: azimuthalGap: 108°   stationPolarityCount: 12   misfit: 0.21   stationDistributionRatio: 0.86   rmsAngDiffAccPref: 23.46   fracAcc30degPref: 0.85   qualityCode: B 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/1765354225065
Event info last updated: 2025.12.10-09:10:34 UTC
Event first association/location: 2025.12.10-08:17:05 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI