ruaumoko: 1991 Rotoaira/Rotopounamu quakes

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1991 Rotoaira/Rotopounamu quakes

There were 7 quakes in the Rotoaira/Rotopounamu area in 1991, the only notable multiple sequence being two magnitude 2 events on the 10th April, a 2.121ML under Onepoto Craters and a 2.748ML under the eastern edge of Lake Rotopounamu.
The largest and deepest event of 1991 was a 3.188ML, at 90km deep, located under Mt. Pihanga (marked on map as a grey coloured orb)

total 7 quakes Rotoaira/Rotopounamu area 1991

total 7 quakes Rotoaira/Rotopounamu area 1991

REF, LAT, LONG, TIME, DEPTH, MAG
210715, -39.05222, 175.7637, 1991/03/14 19:30:07.8, 90, 3.188
214488, -39.04691, 175.68997, 1991/03/20 21:31:47.2, 33, 1.549
215836, -39.05172, 175.77127, 1991/03/30 17:43:11.2, 33, 1.789
220424, -39.02683, 175.74384, 1991/04/10 03:31:21.5, 10, 2.748
220026, -39.03887, 175.73059, 1991/04/10 04:13:35.7, 16, 2.121
255392, -39.04039, 175.7751, 1991/08/30 08:30:58.4, 30, 1.707
274240, -39.03325, 175.72935, 1991/11/09 03:34:04.5, 16, 1.603

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.