The Richter scale is a standard scale used to compare earthquakes. It is a logarithmic scale , meaning that the numbers on the scale measure factors of 10. So, for example, an earthquake that measures on the Richter scale is 10 times larger than one that measures . On the Richter scale, anything below is undetectable to a normal person and is called a microquake . Microquakes occur constantly. Moderate earthquakes measure less than or so on the Richter scale. Earthquakes measuring more than can cause significant damage. The biggest quake in the world since 1900 scored a on the Richter scale. It rocked Chile on May 22, 1960.
The Illinois Basin including Indiana and Kentucky contains about 86 trillion cubic feet of natural gas. It remains largely undeveloped due to poorly developed pipeline infrastructure and, until very recently, public policy that permitted meaningful gas production data to remain obscure from public inspection.
The Rough Creek Fault System in West Kentucky is the easternmost end of the giant New Madrid Fault System. For commercial shale gas production, faults can provide trapping mechanisms and fractures provide permeability pathways that allow gas (and oil and water) to move around inside the reservoir. Understanding the location, orientation and intensity of local faults and fractures systems is an essential science in commercial shale gas production. more