Early-est:     New Britain Region, P.N.G.    2026.08.17-11:00:28.26    q:C      mb:4.9*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1786964428512.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1786964428512.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1786964428512.mech.hash.thumb.jpg

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

Earthquake Details:
Magnitude: mb: 4.9* [10]    Mwp: - [0]    Mwpd: - [0]
Region: New Britain Region, P.N.G.
Origin Time: 2026.08.17-11:00:28.26 UTC
Hypocenter: lat: -6.50°  lon: 149.11°  [+/-17km]    depth: 43km  [+/-31km]
Location Quality: qualityCode:  C     stdErr: 0.9s   assocPhases: 12   usedPhases: 10
minDist: 3.8°   maxDist: 34.7°   AzGap: 74°   2ndAzGap: 148°   atten: -0.59 [+/-0.40]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 17km   azMaxHorUnc: 177°
68%ConfEllipsoid:   semiMajorAxisLength: 33km   majorAxisAzimuth: 172°   majorAxisPlunge: 68°   semiIntermediateAxisLength: 18km   intermediateAxisAzimuth: 46°   intermediateAxisPlunge: 13°   semiMinorAxisLength: 18km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.6 [9]    Td: 4.1Xs [2]    Td*T50Ex: - [0]    To: 34.6s [8]
Closest plate boundaries:
   South Bismarck / Solomon Sea [subduction zone]: distance: ~60km
   South Bismarck - Woodlark [oceanic convergent boundary]: distance: ~110km
   Solomon Sea \ Woodlark [subduction zone]: distance: ~110km
Subduction geometry:    Zone: Solomon Islands: DEBUG: error: [Errno 2] No such file or directory: 'gmt'    Slab depth at epicenter: error: evaluating slab depth: -999.9
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (60km)
 YES (110km)
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       43km
       43km
       43km
Slab depth at epicenter:
       n/a
       -
       -
Tsunami and Rupture predictions (TEST!): No prediction: Event too small (Mwp<7.0) or too few Mwp readings (N<20)
./hypo.1786964428512.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 251°   dip: 55°   rake: -153°
Nodal Plane 2: strike: 145°   dip: 68°   rake: -38°
Quality: azimuthalGap: -1°   stationPolarityCount: 10   misfitWeightCount: 6.6   misfit: 0.00   stationDistributionRatio: 0.53   meanDistP: 44.9   meanDistT: 44.5   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1786964428512.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (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/_polarity_waveform
./hypo.1786964428512.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 252°   dip: 56°   rake: -176°
Nodal Plane 2: strike: 160°   dip: 87°   rake: -34°
Quality: azimuthalGap: 89°   stationPolarityCount: 10   misfit: 0.17   stationDistributionRatio: 0.56   rmsAngDiffAccPref: 38.82   fracAcc30degPref: 0.43   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1786964428512.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1786964428512
Event info last updated: 2026.08.17-11:59:00 UTC
Event first association/location: 2026.08.17-11:07:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA