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Sequence · 2009-08-17

M 6.7 · Observed seismic cluster · 114 km SW of Ishigaki, Japan

Explore clusters of M4.5+ events observed around significant earthquakes. These clusters are descriptive and are not presented as earthquake predictions.

M4.5+ events in cluster12
M6+2
Analysis radius292 km
Observation window14 days
Largest secondary eventM 6.1
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Sequence timeline

Within first 24 hours4
Within first 7 days12
Observed duration3.6 d
Gap from reference eventM 0.6
0 h3.6 d
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Main-event impact

33 Felt reports · Shallow

52/100
Impact and context →

M4.5+ events in cluster

MagnitudeLocationDepthTime
M 6.7114 km SW of Ishigaki, Japan20.0 km2009-08-17 00:05:49 UTCView event →
M 6.1120 km SSW of Ishigaki, Japan15.0 km2009-08-17 10:10:56 UTCView event →
M 5.7112 km SSW of Ishigaki, Japan10.0 km2009-08-17 10:15:05 UTCView event →
M 4.642 km SSE of Yonakuni, Japan10.0 km2009-08-17 10:19:36 UTCView event →
M 5.0115 km SSW of Ishigaki, Japan10.0 km2009-08-18 01:47:52 UTCView event →
M 5.4113 km SW of Ishigaki, Japan5.7 km2009-08-18 13:17:35 UTCView event →
M 4.5114 km SW of Ishigaki, Japan10.0 km2009-08-18 13:27:50 UTCView event →
M 4.5127 km SSE of Yonakuni, Japan10.0 km2009-08-18 13:28:01 UTCView event →
M 4.5109 km SSW of Ishigaki, Japan18.9 km2009-08-18 18:34:40 UTCView event →
M 4.5120 km SSW of Ishigaki, Japan10.0 km2009-08-18 23:37:40 UTCView event →
M 4.8124 km SSE of Yonakuni, Japan4.6 km2009-08-18 23:47:54 UTCView event →
M 5.2119 km SSE of Yonakuni, Japan29.3 km2009-08-20 14:18:12 UTCView event →

Interpretation

Explore clusters of M4.5+ events observed around significant earthquakes. These clusters are descriptive and are not presented as earthquake predictions. Historical small-earthquake detection varies through time. Long-term comparisons are most robust at higher magnitude thresholds.

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