Early-est:     Southern Sumatra, Indonesia    2026.06.20-01:40:10.52    q:B      mb:5.0*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1781919606174.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1781919606174.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1781919606174.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: 5.0* [31]    Mwp: - [0]    Mwpd: - [0]
Region: Southern Sumatra, Indonesia
Origin Time: 2026.06.20-01:40:10.52 UTC
Hypocenter: lat: -4.68°  lon: 103.04°  [+/-17km]    depth: 68km  [+/-16km]
Location Quality: qualityCode:  B     stdErr: 1.5s   assocPhases: 78   usedPhases: 43
minDist: 0.3°   maxDist: 149.1°   AzGap: 164°   2ndAzGap: 168°   atten: -0.96 [+/-0.27]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 17km   azMaxHorUnc: 33°
68%ConfEllipsoid:   semiMajorAxisLength: 22km   majorAxisAzimuth: 31°   majorAxisPlunge: 18°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 287°   intermediateAxisPlunge: 36°   semiMinorAxisLength: 15km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [18]    Td: 0.0Xs [1]    Td*T50Ex: - [0]    To: 1.3s [18]
Closest plate boundaries:
   Sunda / Australia [subduction zone]: distance: ~240km
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 (240km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       68km
       68km
       68km
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.1781919606174.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 93°   dip: 40°   rake: -13°
Nodal Plane 2: strike: 193°   dip: 81°   rake: -129°
Quality: azimuthalGap: -1°   stationPolarityCount: 31   misfitWeightCount: 4.9   misfit: 0.17   stationDistributionRatio: 0.42   meanDistP: 54.9   meanDistT: 53.4   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1781919606174.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.1781919606174.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 7°   dip: 39°   rake: -138°
Nodal Plane 2: strike: 241°   dip: 65°   rake: -59°
Quality: azimuthalGap: 87°   stationPolarityCount: 31   misfit: 0.36   stationDistributionRatio: 0.72   rmsAngDiffAccPref: 41.19   fracAcc30degPref: 0.50   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1781919606174.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1781919606174
Event info last updated: 2026.06.20-02:39:00 UTC
Event first association/location: 2026.06.20-01:49:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA