The Richter scale doesn't measure quake damage (see: Mercalli Scale) which is dependent on a variety of factors including population at the epicentre, terrain, depth, etc.
The circulatory system works with the muscular system, the nervous system, and the digestive system. The heart is a muscle so it is part of the muscular system. Also the heart and lungs have nerves so it is also part of the nervous system.
Circulatory System Your circulatory system has two major jobs: 1. Transportation The main tissue of the human circulatory system is blood. It carries food and oxygen to all the cells of the body. The blood also carries waste away from the cells. It flows inside tubes called blood vessels. The main organ of the circulatory system is the heart.