Early-est:     South of Java, Indonesia    2026.10.13-04:00:19.17    q:B      mb:4.8    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1791864018680.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1791864018680.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1791864018680.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1791864018680.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: 4.8 [23]    Mwp: - [0]    Mwpd: - [0]
Region: South of Java, Indonesia
Origin Time: 2026.10.13-04:00:19.17 UTC
Hypocenter: lat: -9.72°  lon: 113.91°  [+/-14km]    depth: 10km  [+/-14km]
Location Quality: qualityCode:  B     stdErr: 1.4s   assocPhases: 61   usedPhases: 29
minDist: 7.5°   maxDist: 153.9°   AzGap: 71°   2ndAzGap: 99°   atten: -0.92 [+/-0.31]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 14km   azMaxHorUnc: 132°
68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 136°   majorAxisPlunge: 17°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 227°   intermediateAxisPlunge: 3°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.6 [15]    Td: 5.7Xs [1]    Td*T50Ex: - [0]    To: 2.0s [8]
Closest plate boundaries:
   Sunda / Australia [subduction zone]: distance: ~140km
Subduction geometry:    Zone: Sumatra-Java    Slab depth at epicenter: 31km
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:
       10km
       10km
       10km
Slab depth at epicenter:
       31km
       -
       -
./hypo.1791864018680.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 146°   dip: 31°   rake: 45°
Nodal Plane 2: strike: 15°   dip: 68°   rake: 113°
Quality: azimuthalGap: -1°   stationPolarityCount: 34   misfitWeightCount: 6.9   misfit: 0.11   stationDistributionRatio: 0.59   meanDistP: 30.7   meanDistT: 28.4   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1791864018680.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 167°   dip: 21°   rake: 74°
Nodal Plane 2: strike: 4°   dip: 70°   rake: 96°
Quality: azimuthalGap: 71°   stationPolarityCount: 34   misfit: 0.20   stationDistributionRatio: 0.64   rmsAngDiffAccPref: 29.21   fracAcc30degPref: 0.71   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1791864018680.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.1791864018680.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.1791864018680.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1791864018680
Event info last updated: 2026.10.13-05:00:47 UTC
Event first association/location: 2026.10.13-04:11:01 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI