Early-est:     Andaman Islands, India Region    2025.11.09-06:38:30.19    q:A      mb:5.3    Mwp:5.5    Mwpd:-    Td*T50Ex:0.5     fmamp_polarity:./hypo.1762670309310.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1762670309310.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1762670309310.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1762670309310.mech.fmamp_amp_mwp.thumb.jpg

Automatic solution - this event has not been reviewed by a seismologist
Automatically determined event information may be incorrect!

Earthquake Details:
Magnitude: mb: 5.3 [147]    Mwp: 5.5 [12]    Mwpd: 5.8Xinv [3]
Region: Andaman Islands, India Region
Origin Time: 2025.11.09-06:38:30.19 UTC
Hypocenter: lat: 12.41°  lon: 93.70°  [+/-7km]    depth: 116km  [+/-8km]
Location Quality: qualityCode:  A     stdErr: 0.9s   assocPhases: 321   usedPhases: 200
minDist: 1.2°   maxDist: 162.0°   AzGap: 30°   2ndAzGap: 39°   atten: -1.55 [+/-0.13]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 6km   maxHorUnc: 7km   azMaxHorUnc: 165°
68%ConfEllipsoid:   semiMajorAxisLength: 8km   majorAxisAzimuth: 321°   majorAxisPlunge: 68°   semiIntermediateAxisLength: 8km   intermediateAxisAzimuth: 169°   intermediateAxisPlunge: 19°   semiMinorAxisLength: 7km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [114]    Td: 1.3s [21]    Td*T50Ex: 0.5 [21]    To: 1.5s [101]
Closest plate boundaries:
   Sunda - Burma [oceanic spreading ridge]: distance: ~160km
   India \ Burma [subduction zone]: distance: ~210km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (210km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   0.5
   0.5
   0.5
Td*To:
     2.0
     2.0
     2.0
Mwp magnitude:
       5.5
       5.5
       5.5
Hypocenter depth:
       116km
       116km
       116km
Slab depth at epicenter:
       n/a
       -
       -
./hypo.1762670309310.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):
Nodal Plane 1: strike: 156°   dip: 36°   rake: 147°
Nodal Plane 2: strike: 274°   dip: 71°   rake: 59°
Quality: azimuthalGap: -1°   stationPolarityCount: 184   misfitWeightCount: 42.9   misfit: 0.17   stationDistributionRatio: 0.59   meanDistP: 13.6   meanDistT: 16.7   qualityCode: B
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1762670309310.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 178°   dip: 30°   rake: 178°
Nodal Plane 2: strike: 270°   dip: 89°   rake: 60°
Quality: azimuthalGap: 39°   stationPolarityCount: 184   misfit: 0.29   stationDistributionRatio: 0.67   rmsAngDiffAccPref: 25.63   fracAcc30degPref: 0.83   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1762670309310.mech.hash.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_AREF):
Nodal Plane 1: strike: 174°   dip: 25°   rake: 165°
Nodal Plane 2: strike: 278°   dip: 84°   rake: 65°
Quality: azimuthalGap: -1°   stationPolarityCount: 32   misfitWeightCount: 16.7   misfit: 9999.90   stationDistributionRatio: 0.46   meanDistP: 22.1   meanDistT: 26.5   qualityCode: B
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_amp_aref
./hypo.1762670309310.mech.fmamp_amp_aref.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_MWP):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 165°   dip: 33°   rake: 168°
Nodal Plane 2: strike: 265°   dip: 84°   rake: 58°
Quality: azimuthalGap: -1°   stationPolarityCount: 8   misfitWeightCount: 5.8   misfit: 9999.90   stationDistributionRatio: 0.56   meanDistP: 37.4   meanDistT: 30.9   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_amp_mwp
./hypo.1762670309310.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1762670309310
Event info last updated: 2025.11.09-07:38:20 UTC
Event first association/location: 2025.11.09-06:42:26 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI