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GSA Today Zealandia: Earth’s Hidden Continent Cover Image 2 GNS Science, P.O. Box 30368, Lower Hutt 5040, New Zealand 3 SGEES, Victoria University of Wellington, P.O. Box 600, Wellington 6140, New Zealand 4 Service Géologique de Nouvelle Calédonie, B.P. 465, Nouméa 98845, New Caledonia 5 School of Geosciences, University of Sydney, NSW 2006, Australia Abstract A 4.9 Mkm 2 region of the southwest Pacific Ocean is made up of continental crust. The region has elevated bathymetry relative to surrounding oceanic crust, diverse and silica-rich rocks, and relatively thick and low-velocity crustal structure. Its isolation from Australia and large area support its definition as a continent Zealandia. Zealandia was formerly part of Gondwana. Today it is 94% submerged, mainly as a result of widespread Late Cretaceous crustal thinning preceding supercontinent breakup and consequent isostatic balance. The identification of Zealandia as a geological cont ....
Study suggests great earthquakes as cause of Arctic warming A researcher from MIPT has proposed a new explanation for the Arctic s rapid warming. Arctic air temperature anomaly variation since 1900. The thick red lines indicate two phases of abrupt warming. Data compiled by Arctic and Antarctic Research Institute. / Photo: Leopold Lobkovsky / Geosciences EurekaAlert | MOSCOW INSTITUTE OF PHYSICS AND TECHNOLOGY Listen to this article Your browser does not support the audio tag. the warming could have been triggered by a series of great earthquakes. Global warming is one of the pressing issues faced by civilization. It is widely believed to be caused by human activity, which increases the concentration of greenhouse gases in the atmosphere. However, this view does not explain why temperatures sometimes rise fairly abruptly. ....
Not Climate Change, Great Earthquakes in Aleutian Arc Maybe Behind Arctic Warming According to a study by Russian researcher Leopold Lobkovsky, great earthquakes in the Aleutian Arc caused abrupt temperature rise in the Arctic region. By The common notion is that climate change and global warming are responsible for melting ice in the Arctic region. Scientists say that due to the planet s rising temperature, thanks to greenhouse gasses, the Arctic is on a melting spree and contributing to sea-level rise. However, a study claims that the reason could be earthquakes that are contributing to the rising temperature in the Arctic. ....
E-Mail IMAGE: Aleutian Islands are an archipelago comprising dozens of islands with 40 active and 17 dormant volcanoes view more Credit: Shutterstock A researcher from MIPT has proposed a new explanation for the Arctic s rapid warming. In his recent paper in Geosciences, he suggests that the warming could have been triggered by a series of great earthquakes. Global warming is one of the pressing issues faced by civilization. It is widely believed to be caused by human activity, which increases the concentration of greenhouse gases in the atmosphere. However, this view does not explain why temperatures sometimes rise fairly abruptly. In the Arctic, one of the factors driving climate warming is the release of methane from permafrost and metastable gas hydrates in the shelf zone. Since researchers began to monitor temperatures in the Arctic, the region has seen two periods of abrupt warming: first in the 1920s and 30s, and then beginning in 1 ....