Early-est:     Bonin Islands, Japan Region    2025.04.09-06:21:56.58    q:B      mb:4.6*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1744179713463.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1744179713463.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1744179713463.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* [36]    Mwp: - [0]    Mwpd: - [0]
Region: Bonin Islands, Japan Region
Origin Time: 2025.04.09-06:21:56.58 UTC
Hypocenter: lat: 27.83°  lon: 139.82°  [+/-10km]    depth: 503km  [+/-14km]
Location Quality: qualityCode:  B     stdErr: 0.9s   assocPhases: 50   usedPhases: 40
minDist: 2.2°   maxDist: 85.2°   AzGap: 54°   2ndAzGap: 96°   atten: -0.64 [+/-0.21]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 7km   maxHorUnc: 10km   azMaxHorUnc: 142°
68%ConfEllipsoid:   semiMajorAxisLength: 15km   majorAxisAzimuth: 3°   majorAxisPlunge: 62°   semiIntermediateAxisLength: 12km   intermediateAxisAzimuth: 128°   intermediateAxisPlunge: 17°   semiMinorAxisLength: 8km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [21]    Td: 0.4Xs [2]    Td*T50Ex: - [0]    To: 1.1s [20]
Closest plate boundaries:
   Philippine Sea / Pacific [subduction zone]: distance: ~310km
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 (310km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       503km
       503km
       503km
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.1744179713463.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 261°   dip: 73°   rake: 14°
Nodal Plane 2: strike: 167°   dip: 77°   rake: 163°
Quality: azimuthalGap: -1°   stationPolarityCount: 32   misfitWeightCount: 13.8   misfit: 0.10   stationDistributionRatio: 0.43   meanDistP: 44.6   meanDistT: 35.5   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1744179713463.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.1744179713463.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 171°   dip: 81°   rake: 177°
Nodal Plane 2: strike: 262°   dip: 87°   rake: 9°
Quality: azimuthalGap: 62°   stationPolarityCount: 32   misfit: 0.20   stationDistributionRatio: 0.80   rmsAngDiffAccPref: 17.32   fracAcc30degPref: 1.00   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1744179713463.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1744179713463
Event info last updated: 2025.04.09-07:20:00 UTC
Event first association/location: 2025.04.09-06:26:02 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA