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Earthquake is a shaking of the ground caused by the sudden breaking and shifting of large sections of Earth’s rocky outer shell.  A severe earthquake may release energy 10,000 times as great as that of the first atomic bomb. Rock … Continue reading →

Magma is molten or partially molten rock beneath the Earth’s surface. When magma erupts onto the surface, it is called lava. Magma typically consists of (1) a liquid portion (often referred to as the melt); (2) a solid portion made … Continue reading →

In seismology a scale of seismic intensity is a way of measuring or rating the effects of an earthquake at different sites. The Modified Mercalli Intensity Scale is commonly used in the United States by seismologists seeking information on the … Continue reading →

Orbiter’s Designed Three-Year Mission, Begins its 24th Year in Operation March 13 March 2008 The earth imaging satellite Landsat 5 is once again collecting and downlinking land-image data. The satellite was temporarily taken out of service in October 2007 following … Continue reading →