ruaumoko: 1999 Rotoaira/Rotopounamu quakes

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1999 Rotoaira/Rotopounamu quakes

In 1999 there were 13 earthquakes in the Rotoaira/Rotopounamu area, the closest thing to a swarm was a series of 5 events on the 27th and 28th February. The largest quake in 1999 was a 2.431ML 7km deep under Matapupuni Stream north of Te Ponanga Road on 27th February at 02:49:49.4 UTC.

total 13 quakes Rotoaira/Rotopounamu area 1999

total 13 quakes Rotoaira/Rotopounamu area 1999

REF, LAT, LONG, TIME, DEPTH, MAG
1363156, -39.02495, 175.71417, 1999/02/17 17:02:16.0, 5, 1.423
1377706, -39.02744, 175.73485, 1999/02/20 14:07:35.9, 5, 1.44
1369817, -39.01824, 175.71817, 1999/02/27 02:49:49.4, 7, 2.431
1369822, -39.02443, 175.72803, 1999/02/27 07:35:31.7, 5, 1.919
1369823, -39.01605, 175.7235, 1999/02/27 07:50:48.1, 9, 2.1
1369856, -39.02859, 175.71146, 1999/02/28 03:42:27.3, 5, 1.522
1369858, -39.01897, 175.71707, 1999/02/28 05:07:56.0, 5, 2.327
1395215, -39.02836, 175.69376, 1999/04/19 13:14:05.1, 5, 1.267
1424372, -39.01929, 175.74179, 1999/08/19 15:13:01.4, 5, 1.631
1428208, -39.02145, 175.70267, 1999/09/05 08:31:15.7, 11, 1.628
1430216, -39.03331, 175.70935, 1999/09/17 07:39:47.5, 5, 1.482
1468315, -39.02621, 175.78966, 1999/12/28 13:51:22.9, 5, 1.464
1468319, -39.02725, 175.78214, 1999/12/28 14:21:29.0, 5, 1.474

data by geonet. map by google maps. plots by highace using GPS Visualizer

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Earthquake Swarms

Earthquake swarms are events where a local area experiences sequences of many earthquakes striking in a relatively short period of time. The length of time used to define the swarm itself varies, but the United States Geological Survey points out that an event may be on the order of days, weeks, or months. They are differentiated from earthquakes succeeded by a series of aftershocks by the observation that no single earthquake in the sequence is obviously the main shock. Earthquake swarms are one of the events typically preceding eruptions of volcanoes

Earthquake Aftershocks

An aftershock is an earthquake that occurs after a previous earthquake (the main shock). An aftershock is in the same region of the main shock but is always of smaller magnitude strength. If an aftershock is larger than the main shock, the aftershock is redesignated as the main shock and the original main shock is redesignated as a foreshock. Aftershocks are smaller earthquakes formed as the crust around the displaced fault plane adjusts to the effects of the main shock

Aftershocks are dangerous because they are usually unpredictable, can be of a large magnitude, and can collapse buildings that are damaged from the mainshock. Bigger earthquakes have more and larger aftershocks and the sequences can last for years or even longer especially when a large event occurs in a seismically quiet area; see, for example, the New Madrid Seismic Zone, where events still follow Omori's law from the mainshocks of 1811–1812. An aftershock sequence is deemed to have ended when the rate of seismicity drops back to a background level; i.e., no further decay in the number of events with time can be detected.