generally large earthquakes are about what magnitude? Also does anyone know clearly what fault lines are because how do they actually make earthquakes occur???
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Large earthquakes are usually magnitude 7 and over. They potentially cause serious damage over large areas. Earthquakes cause fault lines, not vice versa.
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6.3 magnitude killed 181 people here in Christchurch, New-Zealand on February 22nd this year. It was shallow as most of our quakes and after shocks are. 4.9 or 5 can feel large as they are at a depth of about 5 kilometres. I'm not an expert but I think fault lines are caused because of the earthquakes.
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above 7 richter scale