Early-est:     Santa Cruz Islands    2026.03.25-15:33:17.96    q:B      mb:4.9*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1774452798731.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1774452798731.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1774452798731.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* [23]    Mwp: - [0]    Mwpd: - [0]
Region: Santa Cruz Islands
Origin Time: 2026.03.25-15:33:17.96 UTC
Hypocenter: lat: -12.38°  lon: 166.72°  [+/-14km]    depth: 96km  [+/-21km]
Location Quality: qualityCode:  B     stdErr: 0.7s   assocPhases: 48   usedPhases: 32
minDist: 7.3°   maxDist: 151.5°   AzGap: 173°   2ndAzGap: 185°   atten: -1.40 [+/-0.29]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 14km   azMaxHorUnc: 134°
68%ConfEllipsoid:   semiMajorAxisLength: 22km   majorAxisAzimuth: 216°   majorAxisPlunge: 73°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 312°   intermediateAxisPlunge: 2°   semiMinorAxisLength: 14km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.3 [14]    Td: 0.7Xs [1]    Td*T50Ex: - [0]    To: 2.8s [14]
Closest plate boundaries:
   Pacific / Australia [subduction zone]: distance: ~100km
   New Hebrides - Pacific [continental convergent boundary]: distance: ~150km
   New Hebrides / Australia [subduction zone]: distance: ~170km
Subduction geometry:    Zone: Santa Cruz Islands/Vanuatu/Loyalty 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 (100km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       96km
       96km
       96km
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.1774452798731.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 147°   dip: 28°   rake: -143°
Nodal Plane 2: strike: 23°   dip: 74°   rake: -67°
Quality: azimuthalGap: -1°   stationPolarityCount: 22   misfitWeightCount: 7.1   misfit: 0.12   stationDistributionRatio: 0.51   meanDistP: 40.9   meanDistT: 44.4   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1774452798731.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.1774452798731.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 147°   dip: 52°   rake: -145°
Nodal Plane 2: strike: 33°   dip: 63°   rake: -44°
Quality: azimuthalGap: 140°   stationPolarityCount: 22   misfit: 0.30   stationDistributionRatio: 0.63   rmsAngDiffAccPref: 36.50   fracAcc30degPref: 0.63   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1774452798731.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1774452798731
Event info last updated: 2026.03.25-16:32:00 UTC
Event first association/location: 2026.03.25-15:44:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA