Early-est:     Santa Cruz Islands    2026.09.25-20:41:07.81    q:B      mb:4.4*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1790368859082.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1790368859082.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1790368859082.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: 4.4* [11]    Mwp: - [0]    Mwpd: - [0]
Region: Santa Cruz Islands
Origin Time: 2026.09.25-20:41:07.81 UTC
Hypocenter: lat: -11.31°  lon: 167.39°  [+/-14km]    depth: 221km  [+/-16km]
Location Quality: qualityCode:  B     stdErr: 1.7s   assocPhases: 53   usedPhases: 16
minDist: 4.1°   maxDist: 95.1°   AzGap: 190°   2ndAzGap: 201°   atten: -2.14 [+/-0.35]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 14km   azMaxHorUnc: 66°
68%ConfEllipsoid:   semiMajorAxisLength: 20km   majorAxisAzimuth: 246°   majorAxisPlunge: 37°   semiIntermediateAxisLength: 14km   intermediateAxisAzimuth: 71°   intermediateAxisPlunge: 53°   semiMinorAxisLength: 14km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [4]    Td: 2.4Xs [1]    Td*T50Ex: - [0]    To: 1.2s [4]
Closest plate boundaries:
   Pacific / Australia [subduction zone]: distance: ~200km
Subduction geometry: none or not available
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:
       221km
       221km
       221km
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.1790368859082.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 1°   dip: 9°   rake: -10°
Nodal Plane 2: strike: 101°   dip: 88°   rake: -99°
Quality: azimuthalGap: -1°   stationPolarityCount: 13   misfitWeightCount: 3.9   misfit: 0.05   stationDistributionRatio: 0.38   meanDistP: 45.3   meanDistT: 50.3   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1790368859082.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.1790368859082.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: 191°   stationPolarityCount: 13   misfit: 0.99   stationDistributionRatio: 0.74   rmsAngDiffAccPref: 31.42   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1790368859082.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1790368859082
Event info last updated: 2026.09.25-21:40:02 UTC
Event first association/location: 2026.09.25-20:51:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA