VII 6 Slight to moderate damage in well built, ordinary structures. Considerable damage to poorly built structures. Some walls may fall. VIII 6 to 7 Little damage in specially built structures. Considerable damage to ordinary buildings, severe damage to poorly built structures.
Some walls collapse.
IX 7 Considerable damage to specially built structures, buildings shifted off foundations. Ground cracked noticeably. X 7 to 8 Most masonry and frame structures and their foundations destroyed. Ground badly cracked. XI 8 Total damage.