ruaumoko: 2010 February 1-2 UTC Whale Island Swarm, Bay of Plenty

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2010 February 1-2 UTC Whale Island Swarm, Bay of Plenty

Small 7 quake swarm north east of Whale Island on 2010 February 1st and 2nd UTC, all very-minor magnitude 2.282ML - 2.611ML, none reported as felt. One micro quake to the north west is shown on the map and list but is likely more related to the following event than the Whale Island Swarm.
On February 2 2010 at 9:04:55 am UTC (Tuesday, February 2 2010 at 10:04:55 pm NZDT), a magnitude 3.243ML just outside this search area (not shown on map) at Lat -37.92031, Long 176.84407, south of the Tarawera River and west of Thornton was reported felt in the Thornton, Whakatane, Ohope area (34 reports) followed by a 2.673ML north of Thornton Rd, at 09:18:18 which was not reported as felt.

REF, LAT, LONG, TIME, DEPTH, MAG
3250407, -37.84077, 177.01106, 2010/2/1 8:22:53.5, 3, 2.61
3250408, -37.84383, 177.01175, 2010/2/1 8:27:43.6, 5, 2.452
3250411, -37.82677, 177.01147, 2010/2/1 8:33:45.0, 5, 2.611
3250419, -37.85508, 177.02809, 2010/2/1 9:4:14.1, 3, 2.282
3250437, -37.82167, 177.0154, 2010/2/1 9:55:56.3, 3, 2.533
3250450, -37.82978, 177.00929, 2010/2/1 10:29:58.6, 5, 2.336
3250763, -37.84171, 177.01079, 2010/2/2 3:54:1.5, 5, 2.446
3257488, -37.79134, 176.85446, 2010/2/2 16:25:1.9, 5, 1.4

click on orb markers on map for details

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data by geonet. maps 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.