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Sequence · 2013-07-21

M 6.5 · Observed seismic cluster · 38 km ESE of Blenheim, New Zealand

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 cluster25
M6+1
Analysis radius260 km
Observation window14 days
Largest secondary eventM 5.3
Quake Pulse

Sequence timeline

Within first 24 hours15
Within first 7 days19
Observed duration11.3 d
Gap from reference eventM 1.2
0 h11.3 d
Quake Pulse

Main-event impact

69 Felt reports · PAGER YELLOW · Tsunami indicator · Shallow

67/100
Impact and context →

M4.5+ events in cluster

MagnitudeLocationDepthTime
M 6.538 km ESE of Blenheim, New Zealand17.0 km2013-07-21 05:09:31 UTCView event →
M 5.334 km E of Blenheim, New Zealand12.7 km2013-07-21 05:13:50 UTCView event →
M 4.635 km SW of Brooklyn, New Zealand7.7 km2013-07-21 05:17:00 UTCView event →
M 4.635 km E of Blenheim, New Zealand6.1 km2013-07-21 05:31:38 UTCView event →
M 4.636 km E of Blenheim, New Zealand16.1 km2013-07-21 06:06:22 UTCView event →
M 4.536 km ESE of Blenheim, New Zealand9.3 km2013-07-21 06:23:26 UTCView event →
M 4.737 km E of Blenheim, New Zealand16.1 km2013-07-21 06:59:15 UTCView event →
M 4.532 km ESE of Blenheim, New Zealand16.8 km2013-07-21 07:28:49 UTCView event →
M 4.631 km ESE of Blenheim, New Zealand20.8 km2013-07-21 08:28:15 UTCView event →
M 4.533 km ESE of Blenheim, New Zealand13.1 km2013-07-21 09:32:13 UTCView event →
M 4.929 km ENE of Blenheim, New Zealand10.0 km2013-07-21 15:15:11 UTCView event →
M 4.528 km ENE of Blenheim, New Zealand10.0 km2013-07-21 15:22:13 UTCView event →
M 5.026 km ESE of Blenheim, New Zealand15.7 km2013-07-21 22:47:25 UTCView event →
M 4.7Cook Strait, New Zealand14.0 km2013-07-21 23:35:52 UTCView event →
M 4.631 km E of Blenheim, New Zealand14.4 km2013-07-22 01:48:33 UTCView event →
M 4.626 km SE of Blenheim, New Zealand14.7 km2013-07-22 06:43:09 UTCView event →
M 4.530 km ESE of Blenheim, New Zealand13.4 km2013-07-22 10:03:12 UTCView event →
M 4.628 km ESE of Blenheim, New Zealand10.0 km2013-07-22 13:31:46 UTCView event →
M 4.543 km ESE of Blenheim, New Zealand5.1 km2013-07-24 11:03:12 UTCView event →
M 4.934 km SE of Blenheim, New Zealand11.7 km2013-07-28 13:07:14 UTCView event →
M 4.554 km N of Amberley, New Zealand8.9 km2013-07-29 04:37:49 UTCView event →
M 4.536 km E of Blenheim, New Zealand16.3 km2013-07-29 09:44:41 UTCView event →
M 4.743 km SE of Blenheim, New Zealand16.6 km2013-07-31 17:46:05 UTCView event →
M 4.736 km E of Blenheim, New Zealand15.6 km2013-07-31 23:10:11 UTCView event →
M 4.739 km SE of Blenheim, New Zealand6.2 km2013-08-01 12:56:13 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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