Early-est:     Southeast of Ryukyu Islands    2026.06.19-19:36:32.95    q:B      mb:4.9*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1781897791889.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1781897791889.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1781897791889.mech.hash.thumb.jpg

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

Earthquake Details:
Magnitude: mb: 4.9* [40]    Mwp: 5.3X [2]    Mwpd: 5.6Xinv [1]
Region: Southeast of Ryukyu Islands
Origin Time: 2026.06.19-19:36:32.95 UTC
Hypocenter: lat: 24.96°  lon: 128.01°  [+/-30km]    depth: 11km  [+/-34km]
Location Quality: qualityCode:  B     stdErr: 1.5s   assocPhases: 65   usedPhases: 38
minDist: 1.9°   maxDist: 92.2°   AzGap: 85°   2ndAzGap: 122°   atten: -0.56 [+/-0.20]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 20km   maxHorUnc: 30km   azMaxHorUnc: 164°
68%ConfEllipsoid:   semiMajorAxisLength: 38km   majorAxisAzimuth: 350°   majorAxisPlunge: 29°   semiIntermediateAxisLength: 34km   intermediateAxisAzimuth: 138°   intermediateAxisPlunge: 57°   semiMinorAxisLength: 23km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [16]    Td: 2.7Xs [3]    Td*T50Ex: - [0]    To: 19.9s [13]
Closest plate boundaries:
   Okinawa / Philippine Sea [subduction zone]: distance: ~10km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (10km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       11km
       11km
       11km
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)
./hypo.1781897791889.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 101°   dip: 49°   rake: -178°
Nodal Plane 2: strike: 10°   dip: 89°   rake: -41°
Quality: azimuthalGap: -1°   stationPolarityCount: 31   misfitWeightCount: 6.1   misfit: 0.04   stationDistributionRatio: 0.42   meanDistP: 46.7   meanDistT: 45.1   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1781897791889.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.1781897791889.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 296°   dip: 86°   rake: -168°
Nodal Plane 2: strike: 205°   dip: 78°   rake: -4°
Quality: azimuthalGap: 121°   stationPolarityCount: 31   misfit: 0.30   stationDistributionRatio: 0.69   rmsAngDiffAccPref: 15.45   fracAcc30degPref: 1.00   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1781897791889.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1781897791889
Event info last updated: 2026.06.19-20:35:00 UTC
Event first association/location: 2026.06.19-19:40:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA