Recent inactivity in African rift

Article Abstract:

Geological research using global positioning geodesy indicates that the Ethiopian portion of the East African rift is growing wider at one-half to one millimeters a year, or one to two centimeters in 20 years. Moreover, the measurements suggest that an extensive strain of 10 to 20 nanostrain per year affects the region, a remarkably low rate given that the East African rift is believed to be a newly forming plate boundary. Episodic rifting probably accounts for the rift's slow movement; active rifting may take place only once every 3,000 years, much slower than in other rifting zones such as Iceland.

Ethiopia, Rifts (Geology), Great Rift Valley

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The mountains will flow

Article Abstract:

The mountainous regions of western North America with a high gravitational potential energy (GPE) are extending, while those with a low GPE are contracting. The deformation, essentially a flow process, is due to stress and density distribution inside the continent. The deformation is greater in areas with a high temperature. The GPE of the mountains is similar to that in oceanic plates, but the mountains show greater deformation. The geophysical data shows that the mountains are too weak to be considered as a plate, and internal forces are an important parameter in tectonic reconstructions.

Research, North America, Rock deformation, Geophysical research, Mountains

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Plateau 'pop-up' in the great 1897 Assam earthquake

Article Abstract:

Research is presented concerning the geological processes which caused devastation during the earthquake in Assam, India, in June 1897. The 11-meter rise of the Shillong Plateau during the earthquake is discussed.

Earthquakes, Natural disasters, Letter to the Editor, Seismological research, 1897 AD, Assam, India

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