Early-est:     Eastern Honshu, Japan    2023.03.13-20:35:39.13    q:B      mb:4.3*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1678739736685.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1678739736685.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1678739736685.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: 4.3* [7]    Mwp: - [0]    Mwpd: - [0]
Region: Eastern Honshu, Japan
Origin Time: 2023.03.13-20:35:39.13 UTC
Hypocenter: lat: 39.96°  lon: 141.65°  [+/-13km]    depth: 68km  [+/-23km]
Location Quality: qualityCode:  B     stdErr: 1.3s   assocPhases: 14   usedPhases: 11
minDist: 0.9°   maxDist: 49.2°   AzGap: 191°   2ndAzGap: 210°   atten: -1.02 [+/-0.21]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 10km   maxHorUnc: 13km   azMaxHorUnc: 102°
68%ConfEllipsoid:   semiMajorAxisLength: 24km   majorAxisAzimuth: 84°   majorAxisPlunge: 76°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 286°   intermediateAxisPlunge: 13°   semiMinorAxisLength: 12km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.7X [3]    Td: -s [0]    Td*T50Ex: - [0]    To: 109.5Xs [3]
Closest plate boundaries:
   Pacific \ Okhotsk [subduction zone]: distance: ~220km
Subduction geometry:    Zone: Kamchatka/Kurils/Japan    Slab depth at epicenter: 67km
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (220km)
 no
 no
Prob underwater:
 <1%
 <1%
 <1%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       68km
       68km
       68km
Slab depth at epicenter:
       67km
       -
       -
Tsunami and Rupture predictions (TEST!): No prediction: Event too small (Mwp<7.0) or too few Mwp readings (N<20)
./hypo.1678739736685.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 29°   dip: 30°   rake: 55°
Nodal Plane 2: strike: 248°   dip: 66°   rake: 108°
Quality: azimuthalGap: -1°   stationPolarityCount: 8   misfitWeightCount: 2.8   misfit: 0.06   stationDistributionRatio: 0.44   meanDistP: 54.0   meanDistT: 54.1   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1678739736685.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.1678739736685.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (No solution available)
Nodal Plane 1: strike: 999°   dip: 99°   rake: 999°
Nodal Plane 2: strike: 324°   dip: 13°   rake: 135°
Quality: azimuthalGap: 212°   stationPolarityCount: 8   misfit: 0.99   stationDistributionRatio: 0.00   rmsAngDiffAccPref: 0.00   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1678739736685.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/ee/event/1678739736685
Event info last updated: 2023.03.13-21:34:02 UTC
Event first association/location: 2023.03.13-20:38:02 UTC
Software: Early-est 1.2.8xDEV (2023.01.30)
Agency: alomax.net_BETA