My OperaForgotten Earthquakes
Sunday, November 27, 2005 2:57:36 PM
Earthquakes are most frequent along plate boundaries. Mid Oceanic Ridges are also plate boundaries. Oceanic ridges are characterized by shallow earthquakes. These earthquakes practically never reach the news, probably because they usually occur on the ocean floor, Iceland being the exception. On land shallow earthquakes (0-33 km depth) are known to be the most devastating.
Yesterday, Saturday 26 2005, a magnitude 5.7 earthquake occurred in east China and it hit the front pages.
See Yahoo News at http://news.yahoo.com/s/afp/20051126/sc_afp/chinaquake_051126145359
It was a shallow earthquake - the US Geological Survey said it occurred about 10 kilometres below the surface of the earth.
On Tuesday November 22 2005 a magnitude 5.7 earthquake occurred near the Mid Indian Ridge.
See http://earthquake.usgs.gov/recenteqsww/Quakes/usftaj.htm
It was a shallow earthquake - the US Geological Survey said it occurred at a depth of about 10 kilometres.
Did you hear (or read) about it?
Here we have two earthquakes of the same magnitude within a week’s time. One was noticed, the other completely “forgotten”.
At http://www.seismo.ethz.ch/GSHAP/ there is a Global Seismic Hazard map. Lower on the page on the world map of earthquake frequencies the Mid Oceanic Ridges are clearly recognizable as red “lines” in the blue oceans.
Ole
Yesterday, Saturday 26 2005, a magnitude 5.7 earthquake occurred in east China and it hit the front pages.
See Yahoo News at http://news.yahoo.com/s/afp/20051126/sc_afp/chinaquake_051126145359
It was a shallow earthquake - the US Geological Survey said it occurred about 10 kilometres below the surface of the earth.
On Tuesday November 22 2005 a magnitude 5.7 earthquake occurred near the Mid Indian Ridge.
See http://earthquake.usgs.gov/recenteqsww/Quakes/usftaj.htm
It was a shallow earthquake - the US Geological Survey said it occurred at a depth of about 10 kilometres.
Did you hear (or read) about it?
Here we have two earthquakes of the same magnitude within a week’s time. One was noticed, the other completely “forgotten”.
At http://www.seismo.ethz.ch/GSHAP/ there is a Global Seismic Hazard map. Lower on the page on the world map of earthquake frequencies the Mid Oceanic Ridges are clearly recognizable as red “lines” in the blue oceans.
Ole
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