Early-est: Southeast of Ryukyu Islands 2026.10.11-12:13:19.09 q:A mb:5.1 Mwp:- Mwpd:- Td*T50Ex:0.6 fmamp_polarity: hash: fmamp_amp_aref: fmamp_amp_mwp:

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

Earthquake Details:
Magnitude:	mb: 5.1 [75] Mwp: 5.2X [1] Mwpd: 5.2Xinv [1]
Region:	Southeast of Ryukyu Islands
Origin Time:	2026.10.11-12:13:19.09 UTC
Hypocenter:	lat: 23.38° lon: 126.18° [+/-9km] depth: 10km [+/-8km]
Location Quality:	qualityCode: A stdErr: 1.5s assocPhases: 113 usedPhases: 88 minDist: 2.0° maxDist: 150.9° AzGap: 91° 2ndAzGap: 110° atten: -1.20 [+/-0.14]
Location Uncertainty:	68%ConfEllipse: minHorUnc: 7km maxHorUnc: 9km azMaxHorUnc: 166° 68%ConfEllipsoid: semiMajorAxisLength: 11km majorAxisAzimuth: 167° majorAxisPlunge: 10° semiIntermediateAxisLength: 9km intermediateAxisAzimuth: 259° intermediateAxisPlunge: 12° semiMinorAxisLength: 7km

Tsunamigeneic Assesment:

Discriminants:

Prob Underwater: >99%
T50Ex: 0.4 [50]    Td: 1.7s [4]    Td*T50Ex: 0.6 [4]    To: 1.7s [39]
Closest plate boundaries:
   Okinawa / Philippine Sea [subduction zone]: distance: ~30km
   Okinawa - Philippine Sea [oceanic convergent boundary]: distance: ~60km
Subduction geometry: none or not available

Decision table (TEST!):

Event type:

Subduction Zone

Other Thrust/Normal

Strike-slip

Compatible close plate boundary?:

YES (30km)

YES (60km)

Prob underwater:

>99%

Td*T50Ex:

0.6

Td*To:

2.9

Mwp magnitude:

Hypocenter depth:

10km

Slab depth at epicenter:

n/a

First-motion Focal Mechanism (FMAMP_POLARITY): (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1:	strike: 134° dip: 24° rake: -50°
Nodal Plane 2:	strike: 271° dip: 72° rake: -106°
Quality:	azimuthalGap: -1° stationPolarityCount: 70 misfitWeightCount: 8.5 misfit: 0.22 stationDistributionRatio: 0.35 meanDistP: 45.3 meanDistT: 37.0 qualityCode: D
Method:	methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity

./hypo.1791720798692.mech.fmamp_polarity.mechanism.jpg

First-motion Focal Mechanism (HASH): (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1:	strike: 95° dip: 89° rake: 162°
Nodal Plane 2:	strike: 185° dip: 72° rake: 1°
Quality:	azimuthalGap: 110° stationPolarityCount: 70 misfit: 0.33 stationDistributionRatio: 0.71 rmsAngDiffAccPref: 36.31 fracAcc30degPref: 0.77 qualityCode: C
Method:	methodID: smi:gov.usgs/focalmec/HASH_1.2

./hypo.1791720798692.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.1791720798692.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.1791720798692.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1791720798692
Event info last updated: 2026.10.11-13:14:04 UTC
Event first association/location: 2026.10.11-12:21:02 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI

Early-est: Southeast of Ryukyu Islands 2026.10.11-12:13:19.09 q:A mb:5.1 Mwp:- Mwpd:- Td*T50Ex:0.6 fmamp_polarity: hash: fmamp_amp_aref: fmamp_amp_mwp:

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!