Sequence · 2001-12-18

M 6.8 · Observed seismic cluster · 62 km SSW of Yonakuni, 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 cluster17
M6+1
Analysis radius308 km
Observation window14 days
Largest secondary eventM 5.3
Quake Pulse

Sequence timeline

Within first 24 hours10
Within first 7 days14
Observed duration13.5 d
Gap from reference eventM 1.5
0 h13.5 d
Quake Pulse

Main-event impact

Shallow

49/100
Impact and context →

M4.5+ events in cluster

MagnitudeLocationDepthTime
M 6.862 km SSW of Yonakuni, Japan14.0 km2001-12-18 04:02:58 UTCView event →
M 4.656 km SSW of Yonakuni, Japan10.0 km2001-12-18 04:23:47 UTCView event →
M 5.051 km SSW of Yonakuni, Japan10.0 km2001-12-18 04:46:58 UTCView event →
M 4.960 km S of Yonakuni, Japan10.0 km2001-12-18 04:57:45 UTCView event →
M 4.563 km SSE of Yonakuni, Japan10.0 km2001-12-18 05:05:00 UTCView event →
M 5.360 km SSW of Yonakuni, Japan10.0 km2001-12-18 05:13:33 UTCView event →
M 4.870 km S of Yonakuni, Japan10.0 km2001-12-18 05:24:23 UTCView event →
M 4.866 km S of Yonakuni, Japan10.0 km2001-12-18 10:34:42 UTCView event →
M 4.564 km S of Yonakuni, Japan10.0 km2001-12-18 17:31:08 UTCView event →
M 4.672 km S of Yonakuni, Japan10.0 km2001-12-18 22:41:15 UTCView event →
M 4.860 km S of Yonakuni, Japan10.0 km2001-12-19 18:36:21 UTCView event →
M 4.656 km S of Yonakuni, Japan10.0 km2001-12-20 08:45:36 UTCView event →
M 4.649 km W of Ishigaki, Japan10.0 km2001-12-20 21:21:51 UTCView event →
M 5.253 km SW of Yonakuni, Japan10.0 km2001-12-22 21:40:25 UTCView event →
M 4.789 km NE of Hengchun, Taiwan10.0 km2001-12-27 08:34:48 UTCView event →
M 5.144 km SSW of Yonakuni, Japan10.0 km2001-12-28 00:41:38 UTCView event →
M 4.875 km S of Yonakuni, Japan10.0 km2001-12-31 15:13:05 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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