Early-est: Ceram Sea 2026.08.12-10:15:38.38 q:C mb:4.3* Mwp:- Mwpd:- Td*T50Ex:- fmamp_polarity: fmamp_polarity_waveform: hash:

Automatic solution - this event has not been reviewed by a seismologist
Automatically determined event information may be incorrect!

Earthquake Details:
Magnitude:	mb: 4.3* [4] Mwp: - [0] Mwpd: - [0]
Region:	Ceram Sea
Origin Time:	2026.08.12-10:15:38.38 UTC
Hypocenter:	lat: -2.85° lon: 128.16° [+/-14km] depth: 68km [+/-37km]
Location Quality:	qualityCode: C stdErr: 1.2s assocPhases: 9 usedPhases: 6 minDist: 4.1° maxDist: 141.4° AzGap: 196° 2ndAzGap: 248° atten: -1.44 [+/-0.52]
Location Uncertainty:	68%ConfEllipse: minHorUnc: 11km maxHorUnc: 14km azMaxHorUnc: 172° 68%ConfEllipsoid: semiMajorAxisLength: 38km majorAxisAzimuth: 132° majorAxisPlunge: 86° semiIntermediateAxisLength: 17km intermediateAxisAzimuth: 354° intermediateAxisPlunge: 3° semiMinorAxisLength: 14km

Tsunamigeneic Assesment:

Discriminants:

Prob Underwater: 76%
T50Ex: 0.7X [3]    Td: -s [0]    Td*T50Ex: - [0]    To: 28.6Xs [3]
Closest plate boundaries:
   Birds Head - Banda Sea [continental convergent boundary]: distance: ~70km
   Birds Head \ Banda Sea [subduction zone]: distance: ~70km
   Molucca Sea - Banda Sea [continental transform fault]: distance: ~70km
   Molucca Sea - Birds Head [continental transform fault]: distance: ~130km
   Molucca Sea \ Birds Head [subduction zone]: distance: ~380km
Subduction geometry: none or not available

Decision table (TEST!):

Event type:

Subduction Zone

Other Thrust/Normal

Strike-slip

Compatible close plate boundary?:

YES (70km)

Prob underwater:

76%

Td*T50Ex:

Td*To:

Mwp magnitude:

Hypocenter depth:

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)

First-motion Focal Mechanism (FMAMP_POLARITY): (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

./hypo.1786529738383.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.1786529738383.mech.fmamp_polarity_waveform.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: 0° stationPolarityCount: 5 misfit: 0.99 stationDistributionRatio: 0.00 rmsAngDiffAccPref: 0.00 fracAcc30degPref: 0.00 qualityCode: F
Method:	methodID: smi:gov.usgs/focalmec/HASH_1.2

./hypo.1786529738383.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1786529738383
Event info last updated: 2026.08.12-11:14:00 UTC
Event first association/location: 2026.08.12-10:21:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA

Early-est: Ceram Sea 2026.08.12-10:15:38.38 q:C mb:4.3* Mwp:- Mwpd:- Td*T50Ex:- fmamp_polarity: fmamp_polarity_waveform: hash:

Automatic solution - this event has not been reviewed by a seismologist Automatically determined event information may be incorrect!

Automatic solution - this event has not been reviewed by a seismologist
Automatically determined event information may be incorrect!