Early-est:     Andaman Islands, India Region    2026.08.11-19:55:51.68    q:C      mb:4.5*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1786478152114.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1786478152114.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1786478152114.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: 4.5* [19]    Mwp: - [0]    Mwpd: - [0]
Region: Andaman Islands, India Region
Origin Time: 2026.08.11-19:55:51.68 UTC
Hypocenter: lat: 10.96°  lon: 94.10°  [+/-13km]    depth: 199km  [+/-17km]
Location Quality: qualityCode:  C     stdErr: 2.2s   assocPhases: 57   usedPhases: 33
minDist: 5.8°   maxDist: 152.5°   AzGap: 51°   2ndAzGap: 78°   atten: -0.93 [+/-0.27]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 13km   azMaxHorUnc: 90°
68%ConfEllipsoid:   semiMajorAxisLength: 20km   majorAxisAzimuth: 83°   majorAxisPlunge: 47°   semiIntermediateAxisLength: 14km   intermediateAxisAzimuth: 315°   intermediateAxisPlunge: 30°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [9]    Td: 0.7Xs [1]    Td*T50Ex: - [0]    To: 1.5s [9]
Closest plate boundaries:
   Sunda - Burma [oceanic spreading ridge]: distance: ~50km
   India \ Burma [subduction zone]: distance: ~280km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (280km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       199km
       199km
       199km
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.1786478152114.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 6°   dip: 50°   rake: 173°
Nodal Plane 2: strike: 101°   dip: 84°   rake: 41°
Quality: azimuthalGap: -1°   stationPolarityCount: 19   misfitWeightCount: 5.0   misfit: 0.06   stationDistributionRatio: 0.57   meanDistP: 50.4   meanDistT: 46.2   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1786478152114.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.1786478152114.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 2°   dip: 45°   rake: 178°
Nodal Plane 2: strike: 93°   dip: 89°   rake: 45°
Quality: azimuthalGap: 77°   stationPolarityCount: 19   misfit: 0.24   stationDistributionRatio: 0.69   rmsAngDiffAccPref: 25.17   fracAcc30degPref: 0.87   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1786478152114.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1786478152114
Event info last updated: 2026.08.11-20:54:00 UTC
Event first association/location: 2026.08.11-20:06:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA