How We Document Earthquakes
The burning of San Francisco. Reproduced from the only photograph that shows the entire scope and extent of this terrible conflagration the worst within the historical past of the world.
Attach the string to the rod to easily change the place that the string is hooked up to the rod. The distance from the pivot level to the string is something you possibly can modify to search out where you get a secure arrangement. Distance A needs to be about three/four of distance B (so if B is 4 ft long, use an A of about three toes). You can both have the pen pointing horizontally, and the paper mounted vertically, or attach the pen so it is vertical and have it pushing very gently down on the horizontal paper.
Earthquake hypocentres are most typical within the depths of zero to 70 kilometres. Less common are earthquakes having hypocentres in … Read the rest