Early-est:     Off East Coast of Honshu, Japan    2024.12.20-18:58:25.46    q:B      mb:4.9*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1734721108487.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1734721108487.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1734721108487.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* [34]    Mwp: 4.3X [1]    Mwpd: - [0]
Region: Off East Coast of Honshu, Japan
Origin Time: 2024.12.20-18:58:25.46 UTC
Hypocenter: lat: 33.15°  lon: 141.13°  [+/-17km]    depth: 30km  [+/-17km]
Location Quality: qualityCode:  B     stdErr: 1.3s   assocPhases: 60   usedPhases: 47
minDist: 1.1°   maxDist: 148.7°   AzGap: 105°   2ndAzGap: 117°   atten: -0.87 [+/-0.19]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 17km   azMaxHorUnc: 95°
68%ConfEllipsoid:   semiMajorAxisLength: 21km   majorAxisAzimuth: 276°   majorAxisPlunge: 9°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 23°   intermediateAxisPlunge: 63°   semiMinorAxisLength: 16km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.3 [20]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.5s [19]
Closest plate boundaries:
   Philippine Sea / Pacific [subduction zone]: distance: ~80km
   Okhotsk - Philippine Sea [oceanic convergent boundary]: distance: ~140km
   Pacific \ Okhotsk [subduction zone]: distance: ~140km
   Amur / Philippine Sea [subduction zone]: distance: ~270km
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 (80km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       30km
       30km
       30km
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.1734721108487.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 157°   dip: 4°   rake: -173°
Nodal Plane 2: strike: 60°   dip: 89°   rake: -86°
Quality: azimuthalGap: -1°   stationPolarityCount: 36   misfitWeightCount: 7.5   misfit: 0.14   stationDistributionRatio: 0.33   meanDistP: 41.7   meanDistT: 50.3   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1734721108487.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.1734721108487.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 56°   dip: 74°   rake: -96°
Nodal Plane 2: strike: 258°   dip: 17°   rake: -69°
Quality: azimuthalGap: 117°   stationPolarityCount: 36   misfit: 0.27   stationDistributionRatio: 0.73   rmsAngDiffAccPref: 35.13   fracAcc30degPref: 0.64   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1734721108487.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1734721108487
Event info last updated: 2024.12.20-19:57:01 UTC
Event first association/location: 2024.12.20-19:06:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA