Early-est:     New Britain Region, P.N.G.    2026.09.26-14:08:19.71    q:A      mb:5.3    Mwp:5.8*    Mwpd:-    Td*T50Ex:1.0     fmamp_polarity:./hypo.1790431700433.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1790431700433.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1790431700433.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: 5.3 [68]    Mwp: 5.8* [9]    Mwpd: 5.7Xinv [8]
Region: New Britain Region, P.N.G.
Origin Time: 2026.09.26-14:08:19.71 UTC
Hypocenter: lat: -4.59°  lon: 152.85°  [+/-14km]    depth: 65km  [+/-17km]
Location Quality: qualityCode:  A     stdErr: 1.1s   assocPhases: 180   usedPhases: 120
minDist: 0.8°   maxDist: 157.7°   AzGap: 23°   2ndAzGap: 28°   atten: -1.24 [+/-0.23]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 14km   azMaxHorUnc: 129°
68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 305°   majorAxisPlunge: 46°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 181°   intermediateAxisPlunge: 28°   semiMinorAxisLength: 16km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: 1%
T50Ex: 0.5 [60]    Td: 2.2s [12]    Td*T50Ex: 1.0 [12]    To: 4.1s [59]
Closest plate boundaries:
   North Bismarck - South Bismarck [continental transform fault]: distance: ~10km
   South Bismarck / Solomon Sea [subduction zone]: distance: ~120km
   Pacific - North Bismarck [oceanic transform fault]: distance: ~180km
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 (120km)
 no
 YES (10km)
Prob underwater:
 1%
 1%
 1%
Td*T50Ex:
   1.0
   1.0
   1.0
Td*To:
     9.0
     9.0
     9.0
Mwp magnitude:
       5.8*
       5.8*
       5.8*
Hypocenter depth:
       65km
       65km
       65km
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.1790431700433.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 209°   dip: 19°   rake: 19°
Nodal Plane 2: strike: 101°   dip: 84°   rake: 108°
Quality: azimuthalGap: -1°   stationPolarityCount: 61   misfitWeightCount: 16.2   misfit: 0.20   stationDistributionRatio: 0.64   meanDistP: 41.2   meanDistT: 27.5   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1790431700433.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.1790431700433.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 209°   dip: 25°   rake: 40°
Nodal Plane 2: strike: 82°   dip: 74°   rake: 109°
Quality: azimuthalGap: 56°   stationPolarityCount: 61   misfit: 0.27   stationDistributionRatio: 0.79   rmsAngDiffAccPref: 30.57   fracAcc30degPref: 0.72   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1790431700433.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1790431700433
Event info last updated: 2026.09.26-15:07:01 UTC
Event first association/location: 2026.09.26-14:14:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA