ruaumoko: 2010 April 1st Mt. Tihia Swarm

Saturday

2010 April 1st Mt. Tihia Swarm

A small swarm of 15 micro and very-minor earthquakes occured on the 1st April 2010 over a period of 1hr and 10 minutes beneath the northern slopes of Mt. Tihia and Mt. Kuhurua Cone. The swarm trended NW to SE and events occured randomly back and forth across the Hipaua Thermal Area and Waihi Stream. The 1.644ML beneath Mt. Kuhurua Cone was the 2nd to last in the swarm.

REF, LAT, LONG, UTC DATE HOUR, DEPTH, MAG
3284208, -38.96503, 175.72676, 2010/04/01 08:08:20.0, 3, 1.416
3284209, -38.98948, 175.74879, 2010/04/01 08:11:36.0, 11, 1.504
3284212, -38.96439, 175.72041, 2010/04/01 08:16:54.0, 9, 1.784
3284215, -38.96137, 175.71239, 2010/04/01 08:23:23.0, 6, 1.796
3284216, -38.94078, 175.64186, 2010/04/01 08:25:48.0, 5, 1.231
3284219, -38.95936, 175.69673, 2010/04/01 08:32:38.0, 6, 1.625
3284221, -38.96431, 175.71452, 2010/04/01 08:37:32.0, 9, 1.702
3284222, -38.96632, 175.71463, 2010/04/01 08:39:21.0, 8, 1.844
3284223, -38.96225, 175.71362, 2010/04/01 08:41:07.0, 10, 1.577
3284227, -38.96116, 175.70798, 2010/04/01 08:52:33.0, 6, 2.115
3284228, -38.9714, 175.72688, 2010/04/01 08:54:34.0, 6, 1.765
3284230, -38.95441, 175.68619, 2010/04/01 08:58:31.0, 8, 1.412
3284501, -38.96311, 175.69571, 2010/04/01 09:04:27.0, 8, 1.527
3284235, -38.93095, 175.68904, 2010/04/01 09:11:32.0, 19, 1.644
3284238, -38.96216, 175.68764, 2010/04/01 09:18:15.0, 0, 2.244

View Larger Map

No comments:

Post a Comment

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.