Early-est:     Southern Sumatra, Indonesia    2025.02.02-13:38:45.08    q:C      mb:4.5    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1738503525076.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1738503525076.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1738503525076.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1738503525076.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: 4.5 [14]    Mwp: - [0]    Mwpd: - [0]
Region: Southern Sumatra, Indonesia
Origin Time: 2025.02.02-13:38:45.08 UTC
Hypocenter: lat: -2.40°  lon: 101.75°  [+/-12km]    depth: 146km  [+/-17km]
Location Quality: qualityCode:  C     stdErr: 1.4s   assocPhases: 41   usedPhases: 19
minDist: 4.7°   maxDist: 162.8°   AzGap: 96°   2ndAzGap: 143°   atten: -1.16 [+/-0.24]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 12km   azMaxHorUnc: 58°
68%ConfEllipsoid:   semiMajorAxisLength: 17km   majorAxisAzimuth: 13°   majorAxisPlunge: 64°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 251°   intermediateAxisPlunge: 15°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.5 [4]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.1Xs [3]
Closest plate boundaries:
   Sunda / Australia [subduction zone]: distance: ~270km
Subduction geometry:    Zone: Sumatra-Java    Slab depth at epicenter: 116km
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (270km)
 no
 no
Prob underwater:
 <1%
 <1%
 <1%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       146km
       146km
       146km
Slab depth at epicenter:
       116km
       -
       -
./hypo.1738503525076.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 120°   dip: 37°   rake: -65°
Nodal Plane 2: strike: 270°   dip: 57°   rake: -107°
Quality: azimuthalGap: -1°   stationPolarityCount: 16   misfitWeightCount: 5.3   misfit: 0.08   stationDistributionRatio: 0.52   meanDistP: 32.3   meanDistT: 34.3   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1738503525076.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 98°   dip: 34°   rake: -71°
Nodal Plane 2: strike: 255°   dip: 58°   rake: -103°
Quality: azimuthalGap: 65°   stationPolarityCount: 16   misfit: 0.00   stationDistributionRatio: 0.68   rmsAngDiffAccPref: 30.67   fracAcc30degPref: 0.71   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1738503525076.mech.hash.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_AREF):    (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/_amp_aref
./hypo.1738503525076.mech.fmamp_amp_aref.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_MWP):    (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/_amp_mwp
./hypo.1738503525076.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1738503525076
Event info last updated: 2025.02.02-14:39:02 UTC
Event first association/location: 2025.02.02-14:16:23 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI