ruaumoko: Cape Egmont earthquake events 2009

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Cape Egmont earthquake events 2009

The map below shows earthquake events in the Cape Egmont Fault Zone for the period Jan 1st to Dec 31st 2009. 226 earthquakes 0.849ML to 3.846ML

The following events were reported as Felt.
REF, LAT, LONG, TIME UTC, DEPTH, MAG
3027526, -39.10921, 173.63722, 2009/1/9 1:52:12.6, 14, 3.729
3033196, -39.31374, 173.50322, 2009/1/20 9:22:37.3, 5, 3.846
3091166, -39.08566, 173.89745, 2009/5/14 15:14:22.5, 9, 2.915
3106367, -39.25883, 173.7386, 2009/6/11 6:59:28.7, 8, 3.408
3138746, -39.17786, 173.53648, 2009/8/14 0:14:19.3, 12, 3.451
3175587, -39.01117, 174.0569, 2009/10/29 5:22:53.9, 13, 3.202

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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.