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.
30.1 Respiratory and Circulatory Functions Oxygen-poor blood Oxygen-rich blood The respiratory and circulatory systems work together to maintain homeostasis. â¢ The circulatory system transports blood and other materials. âbrings supplies to cells âcarries away wastes âseparates oxygen-poor and oxygen-rich blood