Early-est:     Mariana Islands    2025.04.11-03:18:12.46    q:A      mb:5.1*    Mwp:-    Mwpd:-    Td*T50Ex:0.2     fmamp_polarity:./hypo.1744341495586.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1744341495586.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1744341495586.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* [47]    Mwp: - [0]    Mwpd: - [0]
Region: Mariana Islands
Origin Time: 2025.04.11-03:18:12.46 UTC
Hypocenter: lat: 18.77°  lon: 145.74°  [+/-12km]    depth: 180km  [+/-16km]
Location Quality: qualityCode:  A     stdErr: 1.9s   assocPhases: 98   usedPhases: 69
minDist: 5.3°   maxDist: 157.4°   AzGap: 31°   2ndAzGap: 39°   atten: -1.27 [+/-0.26]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 10km   maxHorUnc: 12km   azMaxHorUnc: 93°
68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 279°   majorAxisPlunge: 52°   semiIntermediateAxisLength: 13km   intermediateAxisAzimuth: 65°   intermediateAxisPlunge: 33°   semiMinorAxisLength: 12km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: 95%
T50Ex: 0.2 [38]    Td: 1.0s [7]    Td*T50Ex: 0.2 [7]    To: 1.6s [38]
Closest plate boundaries:
   Philippine Sea - Mariana [oceanic spreading ridge]: distance: ~120km
   Mariana / Pacific [subduction zone]: distance: ~200km
   Philippine Sea / Pacific [subduction zone]: distance: ~660km
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 (200km)
 no
 no
Prob underwater:
 95%
 95%
 95%
Td*T50Ex:
   0.2
   0.2
   0.2
Td*To:
     1.6
     1.6
     1.6
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       180km
       180km
       180km
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.1744341495586.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 323°   dip: 67°   rake: -9°
Nodal Plane 2: strike: 57°   dip: 82°   rake: -156°
Quality: azimuthalGap: -1°   stationPolarityCount: 43   misfitWeightCount: 12.6   misfit: 0.09   stationDistributionRatio: 0.57   meanDistP: 42.2   meanDistT: 34.3   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1744341495586.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.1744341495586.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 232°   dip: 82°   rake: 164°
Nodal Plane 2: strike: 325°   dip: 74°   rake: 8°
Quality: azimuthalGap: 81°   stationPolarityCount: 43   misfit: 0.23   stationDistributionRatio: 0.79   rmsAngDiffAccPref: 11.62   fracAcc30degPref: 1.00   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1744341495586.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1744341495586
Event info last updated: 2025.04.11-04:17:02 UTC
Event first association/location: 2025.04.11-03:24:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA