Early-est:     Solomon Islands    2026.04.01-13:13:30.49    q:B      mb:4.6*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1775049213847.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1775049213847.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1775049213847.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: 4.6* [10]    Mwp: - [0]    Mwpd: - [0]
Region: Solomon Islands
Origin Time: 2026.04.01-13:13:30.49 UTC
Hypocenter: lat: -8.08°  lon: 155.72°  [+/-14km]    depth: 55km  [+/-17km]
Location Quality: qualityCode:  B     stdErr: 1.1s   assocPhases: 33   usedPhases: 9
minDist: 4.4°   maxDist: 93.7°   AzGap: 141°   2ndAzGap: 194°   atten: -2.38 [+/-0.48]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 14km   azMaxHorUnc: 32°
68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 38°   majorAxisPlunge: 43°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 186°   intermediateAxisPlunge: 42°   semiMinorAxisLength: 14km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.3 [8]    Td: 0.4Xs [1]    Td*T50Ex: - [0]    To: 2.1s [7]
Closest plate boundaries:
   Pacific / Woodlark [subduction zone]: distance: ~40km
   Woodlark - Australia [oceanic transform fault]: distance: ~60km
   Pacific / Australia [subduction zone]: distance: ~60km
   Woodlark - Solomon Sea [oceanic transform fault]: distance: ~70km
   Pacific / Solomon Sea [subduction zone]: distance: ~70km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (40km)
 no
 YES (60km)
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       55km
       55km
       55km
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.1775049213847.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 105°   dip: 24°   rake: -36°
Nodal Plane 2: strike: 228°   dip: 76°   rake: -110°
Quality: azimuthalGap: -1°   stationPolarityCount: 13   misfitWeightCount: 4.0   misfit: 0.03   stationDistributionRatio: 0.38   meanDistP: 51.1   meanDistT: 50.2   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1775049213847.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.1775049213847.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (No solution available)
Nodal Plane 1: strike: 999°   dip: 99°   rake: 999°
Nodal Plane 2: strike: 324°   dip: 13°   rake: 135°
Quality: azimuthalGap: 198°   stationPolarityCount: 13   misfit: 0.99   stationDistributionRatio: 0.00   rmsAngDiffAccPref: 0.00   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1775049213847.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1775049213847
Event info last updated: 2026.04.01-14:12:01 UTC
Event first association/location: 2026.04.01-13:22:02 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA