Early-est:     Southern Sumatra, Indonesia    2020.08.18-22:23:59.38    q:A      mb:5.6    Mwp:6.8*    Mwpd:-    Td*T50Ex:3.6     fmamp_polarity:./hypo.1597789442999.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1597789442999.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1597789442999.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: 5.6 [152]    Mwp: 6.8* [129]    Mwpd: 6.9Xinv [125]
Region: Southern Sumatra, Indonesia
Origin Time: 2020.08.18-22:23:59.38 UTC
Hypocenter: lat: -4.25°  lon: 101.17°  [+/-8km]    depth: 16km  [+/-15km]
Location Quality: qualityCode:  A     stdErr: 1.6s   assocPhases: 482   usedPhases: 232
minDist: 1.8°   maxDist: 176.0°   AzGap: 28°   2ndAzGap: 41°   atten: -1.34 [+/-0.18]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 7km   maxHorUnc: 8km   azMaxHorUnc: 140°
68%ConfEllipsoid:   semiMajorAxisLength: 15km   majorAxisAzimuth: 53°   majorAxisPlunge: 81°   semiIntermediateAxisLength: 9km   intermediateAxisAzimuth: 321°   intermediateAxisPlunge: 0°   semiMinorAxisLength: 9km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.7 [140]    Td: 5.0s [45]    Td*T50Ex: 3.6 [45]    To: 45.3s [140]
Closest plate boundaries:
   Sunda / Australia [subduction zone]: distance: ~100km
Subduction geometry:    Zone: Sumatra-Java    Slab depth at epicenter: 24km
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (100km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   3.6
   3.6
   3.6
Td*To:
     226.5
     226.5
     226.5
Mwp magnitude:
       6.8*
       6.8*
       6.8*
Hypocenter depth:
       16km
       16km
       16km
Slab depth at epicenter:
       24km
       -
       -
Tsunami and Rupture predictions (TEST!): No prediction: Event too small (Mwp<7.0) or too few Mwp readings (N<20)
./hypo.1597789442999.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):
Nodal Plane 1: strike: 3°   dip: 16°   rake: 149°
Nodal Plane 2: strike: 124°   dip: 82°   rake: 76°
Quality: azimuthalGap: -1°   stationPolarityCount: 157   misfitWeightCount: 35.3   misfit: 0.03   stationDistributionRatio: 0.68   meanDistP: 20.8   meanDistT: 18.8   qualityCode: B
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1597789442999.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):
Nodal Plane 1: strike: 20°   dip: 14°   rake: 158°
Nodal Plane 2: strike: 131°   dip: 85°   rake: 77°
Quality: azimuthalGap: -1°   stationPolarityCount: 43   misfitWeightCount: 11.4   misfit: 0.00   stationDistributionRatio: 0.78   meanDistP: 28.0   meanDistT: 23.6   qualityCode: B
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity_waveform
./hypo.1597789442999.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 124°   dip: 71°   rake: 90°
Nodal Plane 2: strike: 305°   dip: 19°   rake: 91°
Quality: azimuthalGap: 33°   stationPolarityCount: 157   misfit: 0.08   stationDistributionRatio: 0.66   rmsAngDiffAccPref: 26.21   fracAcc30degPref: 0.81   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1597789442999.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/ee/event/1597789442999
Event info last updated: 2020.08.18-23:22:05 UTC
Event first association/location: 2020.08.18-22:26:28 UTC
Software: Early-est 1.2.6xDEV (2020.08.15)
Agency: alomax.net_BETA