Early-est:     Southern Sumatra, Indonesia    2026.08.09-15:15:07.42    q:B      mb:5.2*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1786288503237.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1786288503237.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1786288503237.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: 5.2* [54]    Mwp: 5.1X [1]    Mwpd: - [0]
Region: Southern Sumatra, Indonesia
Origin Time: 2026.08.09-15:15:07.42 UTC
Hypocenter: lat: -5.66°  lon: 102.93°  [+/-24km]    depth: 55km  [+/-38km]
Location Quality: qualityCode:  B     stdErr: 1.3s   assocPhases: 99   usedPhases: 77
minDist: 1.3°   maxDist: 150.9°   AzGap: 54°   2ndAzGap: 78°   atten: -1.26 [+/-0.21]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 16km   maxHorUnc: 24km   azMaxHorUnc: 28°
68%ConfEllipsoid:   semiMajorAxisLength: 41km   majorAxisAzimuth: 22°   majorAxisPlunge: 60°   semiIntermediateAxisLength: 25km   intermediateAxisAzimuth: 216°   intermediateAxisPlunge: 29°   semiMinorAxisLength: 19km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [39]    Td: 1.5Xs [3]    Td*T50Ex: - [0]    To: 20.3s [37]
Closest plate boundaries:
   Sunda / Australia [subduction zone]: distance: ~150km
Subduction geometry:    Zone: Sumatra-Java: 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 (150km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       55km
       55km
       55km
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.1786288503237.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 156°   dip: 11°   rake: 29°
Nodal Plane 2: strike: 38°   dip: 85°   rake: 100°
Quality: azimuthalGap: -1°   stationPolarityCount: 54   misfitWeightCount: 11.0   misfit: 0.13   stationDistributionRatio: 0.59   meanDistP: 35.1   meanDistT: 31.1   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1786288503237.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.1786288503237.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 341°   dip: 69°   rake: 166°
Nodal Plane 2: strike: 76°   dip: 77°   rake: 22°
Quality: azimuthalGap: 54°   stationPolarityCount: 54   misfit: 0.21   stationDistributionRatio: 0.70   rmsAngDiffAccPref: 32.17   fracAcc30degPref: 0.72   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1786288503237.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1786288503237
Event info last updated: 2026.08.09-16:14:00 UTC
Event first association/location: 2026.08.09-15:18:02 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA