Early-est:     Sichuan, China    2026.09.25-21:01:29.16    q:B      mb:4.8*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1790370095615.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1790370095615.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1790370095615.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: 4.8* [29]    Mwp: 4.3X [1]    Mwpd: - [0]
Region: Sichuan, China
Origin Time: 2026.09.25-21:01:29.16 UTC
Hypocenter: lat: 28.34°  lon: 104.59°  [+/-21km]    depth: 9km  [+/-37km]
Location Quality: qualityCode:  B     stdErr: 1.5s   assocPhases: 79   usedPhases: 37
minDist: 4.7°   maxDist: 85.7°   AzGap: 60°   2ndAzGap: 71°   atten: -1.27 [+/-0.38]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 21km   azMaxHorUnc: 30°
68%ConfEllipsoid:   semiMajorAxisLength: 40km   majorAxisAzimuth: 29°   majorAxisPlunge: 65°   semiIntermediateAxisLength: 22km   intermediateAxisAzimuth: 211°   intermediateAxisPlunge: 25°   semiMinorAxisLength: 17km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.5 [15]    Td: 2.4Xs [2]    Td*T50Ex: - [0]    To: 1.8s [14]
Closest plate boundaries:
   Eurasia - Yangtze [continental rift boundary]: distance: ~60km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 no
 no
 no
Prob underwater:
 <1%
 <1%
 <1%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       9km
       9km
       9km
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.1790370095615.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 86°   dip: 14°   rake: 50°
Nodal Plane 2: strike: 307°   dip: 79°   rake: 99°
Quality: azimuthalGap: -1°   stationPolarityCount: 38   misfitWeightCount: 8.5   misfit: 0.09   stationDistributionRatio: 0.35   meanDistP: 33.7   meanDistT: 39.2   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1790370095615.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.1790370095615.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 248°   dip: 7°   rake: -155°
Nodal Plane 2: strike: 134°   dip: 87°   rake: -83°
Quality: azimuthalGap: 60°   stationPolarityCount: 38   misfit: 0.21   stationDistributionRatio: 0.68   rmsAngDiffAccPref: 32.09   fracAcc30degPref: 0.53   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1790370095615.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1790370095615
Event info last updated: 2026.09.25-22:00:02 UTC
Event first association/location: 2026.09.25-21:12:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA