ruaumoko: 2004 Rotoaira/Rotopounamu quakes

Friday

2004 Rotoaira/Rotopounamu quakes

2004 was a very quiet year, although 22 quakes occurred in the area, the largest was only 1.875ML.

total 22 quakes Rotoaira/Rotopounamu area 2004

REF, LAT, LONG, TIME, DEPTH, MAG
2180000, -39.0167, 175.7576, 2004/02/01 21:56:34.0, 5, 1.11
2189978, -39.0182, 175.7492, 2004/02/23 22:16:54.6, 5, 1.363
2205811, -39.0329, 175.7043, 2004/03/28 13:12:24.0, 8, 1.551
2215182, -39.0545, 175.7329, 2004/04/16 02:46:14.0, 5, 1.203
2230767, -39.0166, 175.7382, 2004/05/15 23:17:01.5, 5, 1.149

May 24th a small swarm with 5 micro quakes lasting 7 minutes scattered in the area between Onepoto Craters, Motuopuhi Island and Te Ponanga Saddle Rd
2235861, -39.0303, 175.7217, 2004/05/24 02:46:02.6, 7, 1.311
2397114, -39.0355, 175.714, 2004/05/24 02:46:32.2, 5, 1.019
2235864, -39.0377, 175.7282, 2004/05/24 02:51:10.3, 7, 1.226
2397121, -39.0206, 175.7212, 2004/05/24 02:52:38.1, 5, 0.938
2235865, -39.0271, 175.719, 2004/05/24 02:53:16.2, 8, 1.58
small swarm May24th 2004

further earthquakes in 2004;
2254919, -39.0499, 175.7859, 2004/06/28 09:09:26.1, 5, 1.447
2255128, -39.045, 175.6665, 2004/06/28 21:39:43.7, 6, 1.157
2265074, -39.0475, 175.7761, 2004/07/15 04:46:38.1, 5, 1.875
2266446, -39.0579, 175.7882, 2004/07/18 10:58:48.1, 5, 1.749
2267510, -39.0464, 175.7883, 2004/07/20 10:10:49.4, 5, 1.505
2270121, -39.0448, 175.7662, 2004/07/25 20:24:48.3, 5, 1.128
2285659, -39.0155, 175.698, 2004/08/25 14:39:56.4, 5, 1.431
2456575, -39.0191, 175.6997, 2004/08/25 14:42:41.2, 5, 0.942
2291073, -39.0432, 175.7718, 2004/09/07 18:14:40.2, 5, 1.079
2313897, -39.0242, 175.7213, 2004/10/28 11:21:46.0, 5, 1.026
2323311, -39.0382, 175.715, 2004/11/17 06:11:37.4, 5, 1.132
2325340, -39.0217, 175.7469, 2004/11/21 04:53:06.1, 5, 1.649

data by geonet. map by google maps. plots by highace using GPS Visualizer

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.