The maximum S-amplitude, given in mm scale of a recorded earthquake by a standard seismometer at 100 km away from the epicenter, is converted to magnitude (M) by the following relation. About 900-1,000 times more energy.
MG is a British automotive marque registered by the now defunct MG Car Company Limited, a British sports car manufacturer begun in the 1920s as a sales promotion sideline within W R Morris's Oxford city retail sales and service business by the business's manager, Cecil Kimber.
MG underwent many changes in ownership starting with Morris merging with Austin in The British Motor Corporation Limited in 1952. MG became the MG Division of BMC in 1967 and so a component of the 1968 merger that created British Leyland Motor Corporation.