ruaumoko: 2006 Rotoaira/Rotopounamu quakes

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2006 Rotoaira/Rotopounamu quakes

2006 was a very quiet year in the Rotoaira/Rotopounamu area with only 8 earthquakes and no swarms. August was the busiest month with 4 of the 8 quakes for the year. The deepest quake was the 3.073 ML event of September 11th at 95km deep under Lake Rotoaira just south west of Onepoto Craters (shown on map as a grey coloured orb)

total 8 quakes Rotoaira/Rotopounamu area 2006

total 8 quakes Rotoaira/Rotopounamu area 2006

REF, LAT, LONG, TIME, DEPTH, MAG
2744966, -39.0211, 175.7502, 2006/01/16 15:42:41.3, 5, 1.318
2553473, -39.0205, 175.7296, 2006/04/14 06:06:12.4, 5, 1.076
2867963, -39.016, 175.7142, 2006/08/10 22:17:51.3, 5, 1.477
2608800, -39.0202, 175.7436, 2006/08/11 00:01:24.7, 5, 1.412
2874158, -39.0169, 175.7489, 2006/08/14 13:26:17.4, 5, 1.359
2610306, -39.0176, 175.7645, 2006/08/14 13:26:19.6, 5, 2.086
2623523, -39.0529, 175.7196, 2006/09/11 15:28:55.0, 95, 3.073
2672663, -39.0454, 175.7251, 2006/12/23 07:04:28.7, 9, 2.083

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.