Early-est:     South of Java, Indonesia    2026.10.04-12:36:49.08    q:B      mb:4.4    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1791117408845.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1791117408845.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1791117408845.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1791117408845.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: 4.4 [7]    Mwp: - [0]    Mwpd: - [0]
Region: South of Java, Indonesia
Origin Time: 2026.10.04-12:36:49.08 UTC
Hypocenter: lat: -9.51°  lon: 112.79°  [+/-13km]    depth: 20km  [+/-13km]
Location Quality: qualityCode:  B     stdErr: 1.9s   assocPhases: 41   usedPhases: 12
minDist: 7.1°   maxDist: 147.5°   AzGap: 94°   2ndAzGap: 165°   atten: -1.51 [+/-0.82]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 13km   azMaxHorUnc: 139°
68%ConfEllipsoid:   semiMajorAxisLength: 16km   majorAxisAzimuth: 318°   majorAxisPlunge: 3°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 228°   intermediateAxisPlunge: 3°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.6 [5]    Td: -s [0]    Td*T50Ex: - [0]    To: 32.2Xs [2]
Closest plate boundaries:
   Sunda / Australia [subduction zone]: distance: ~140km
Subduction geometry:    Zone: Sumatra-Java    Slab depth at epicenter: 30km
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (140km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       20km
       20km
       20km
Slab depth at epicenter:
       30km
       -
       -
./hypo.1791117408845.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 5°   dip: 75°   rake: -13°
Nodal Plane 2: strike: 98°   dip: 77°   rake: -165°
Quality: azimuthalGap: -1°   stationPolarityCount: 10   misfitWeightCount: 5.0   misfit: 0.09   stationDistributionRatio: 0.39   meanDistP: 44.6   meanDistT: 48.5   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1791117408845.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (No solution available)
Nodal Plane 1: strike: 999°   dip: 99°   rake: 999°
Nodal Plane 2: strike: 324°   dip: 13°   rake: 135°
Quality: azimuthalGap: 189°   stationPolarityCount: 10   misfit: 0.99   stationDistributionRatio: 0.00   rmsAngDiffAccPref: 0.00   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1791117408845.mech.hash.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_AREF):    (No solution available)
Nodal Plane 1: strike: 0°   dip: 0°   rake: nan°
Nodal Plane 2: strike: nan°   dip: nan°   rake: nan°
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/_amp_aref
./hypo.1791117408845.mech.fmamp_amp_aref.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_MWP):    (No solution available)
Nodal Plane 1: strike: 0°   dip: 0°   rake: nan°
Nodal Plane 2: strike: nan°   dip: nan°   rake: nan°
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/_amp_mwp
./hypo.1791117408845.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1791117408845
Event info last updated: 2026.10.04-13:37:02 UTC
Event first association/location: 2026.10.04-12:42:38 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI