Early-est:     Mariana Islands    2026.04.02-06:13:44.43    q:B      mb:5.1*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1775110422428.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1775110422428.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1775110422428.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: 5.1* [34]    Mwp: - [0]    Mwpd: - [0]
Region: Mariana Islands
Origin Time: 2026.04.02-06:13:44.43 UTC
Hypocenter: lat: 18.10°  lon: 146.64°  [+/-13km]    depth: 86km  [+/-18km]
Location Quality: qualityCode:  B     stdErr: 1.4s   assocPhases: 75   usedPhases: 51
minDist: 4.8°   maxDist: 156.4°   AzGap: 44°   2ndAzGap: 62°   atten: -1.82 [+/-0.31]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 13km   azMaxHorUnc: 68°
68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 275°   majorAxisPlunge: 67°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 57°   intermediateAxisPlunge: 19°   semiMinorAxisLength: 14km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [34]    Td: -s [0]    Td*T50Ex: - [0]    To: 23.3s [32]
Closest plate boundaries:
   Mariana / Pacific [subduction zone]: distance: ~120km
   Philippine Sea - Mariana [oceanic transform fault]: distance: ~190km
   Philippine Sea / Pacific [subduction zone]: distance: ~770km
Subduction geometry:    Zone: Izu-Bonin: 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
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       86km
       86km
       86km
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.1775110422428.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 46°   dip: 47°   rake: 137°
Nodal Plane 2: strike: 169°   dip: 60°   rake: 52°
Quality: azimuthalGap: -1°   stationPolarityCount: 35   misfitWeightCount: 8.2   misfit: 0.21   stationDistributionRatio: 0.36   meanDistP: 56.5   meanDistT: 54.4   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1775110422428.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.1775110422428.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 50°   dip: 90°   rake: 168°
Nodal Plane 2: strike: 140°   dip: 78°   rake: 0°
Quality: azimuthalGap: 101°   stationPolarityCount: 35   misfit: 0.30   stationDistributionRatio: 0.82   rmsAngDiffAccPref: 43.24   fracAcc30degPref: 0.46   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1775110422428.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1775110422428
Event info last updated: 2026.04.02-07:12:02 UTC
Event first association/location: 2026.04.02-06:22:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA