The difference between the moment magnitude scale and the Richter scale
By: Sangeeta Deogawanka
The Moment Magnitude and the Richter Scales are modern seismic scales, used to measure and compare the severity of earthquakes. Both these scales are classified as Magnitude scales, that measure the magnitude or original force of an earthquake. The 'magnitude' of an earthquake is expressed...
The difference between the moment magnitude scale and the Richter scale
By: JRR
The earth's continents and seas are carried on underground oceans of extremely hot and semi-solid materials by tectonic plates. These plates are actually huge slabs of rock 50-650 feet (15-200 km) thick. Cracks in these plates are called fault lines. When there is a shift...
Reasons why so many people died during the 2009 L'Aquila earthquake in Italy
By: Anne StClair
The city of L'Aquilia (population approximately 68,500) and several nearby medieval towns and villages in the Abruzzo region of central Italy were hit by an earthquake on the morning of Monday 6 April 2009. The earthquake injured over one thousand people, left an estimated...
The deadliest earthquakes on record
By: JRR
Each year there are more than 1.5 million earthquakes. The majority are small, going unnoticed by humans. Some cause minimal damage, while others are powerful enough to devastate and completely destroy large areas. They cause not only property damage but take a high toll...
What is a lahar?
By: Josephine Polifroni
A lahar is a mudflow or landslide of tephra or pyroclastic material, ash, shattered rock, dust and other material from a volcanic eruption mixed with water. This collection of loose debris, volcanic ash and water, generally has the consistency of flowing concrete and most often...
By: Kimberly Bunch
Lahars are a form of mudslide or landslide that doesn't necessary need to be triggered by volcanism. The name lahar derives from the Javanese Hindi language in Indonesia. The volcanic mud-flow in Hindi means wave. Lahars can effect all of the mountains of the world...
Avalanche survival tips
By: Terry Baldwin
Being Colorado native I've seen a couple of avalanches. I've never experienced one personally, though. It is quite an awesome experience to watch an avalanche, as long as you are far away. When a huge snow mass comes down a mountain side, a human being...
By: Janet Grischy
If we discuss our own size, we can talk about height, weight, frame size, or musculature. We can even combine height and weight measurements into a body mass index, which tries to describe the relationship of height and weight. These various ways of measuring size...
The difference between shallow-focus and deep-focus earthquakes
By: Sangeeta Deogawanka
An earthquake occurs when energy stored inside the earth gets released with great pressure . When this happens, earthquake waves transfer the released energy to the surface of the earth. In the process, physical and chemical changes occur deep within the earth. The tremendous geological forces...
By: Joan Inong
The Earth is constantly changing. Nature and humans have played a part in how the Earth appears today. However, natural forces can change the Earth's appearance dramatically. Erosion occurs everyday, and plays an important role in changing the Earth's surface. Erosion involves the breaking...

 

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