31. The earthquake had an intensity of VI ( " Strong " ) in Newry as measured by the Mercalli intensity scale . 32. The earthquake measured 7.1 on the moment magnitude scale and IX ( " Violent " ) on the Mercalli intensity scale . 33. Unlike magnitude scales, intensity scales do not have a mathematical basis; instead they are an arbitrary ranking based on observed effects. 34. It had a magnitude of 6.1 and a maximum intensity of IX on the Mercalli intensity scale , causing 15, 000 casualties. 35. The Australian intensity scale is based on maximum wind gusts, which are estimated to be 40 percent above 10-minute sustained winds. 36. It had an estimated magnitude of 7.8 and a maximum intensity of X on the Mercalli intensity scale , causing 216 casualties. 37. The Mercalli intensity scale is sometimes used together with the " Shindo "; however this is not usual practice in Japan. 38. The second, now known as the Mercalli intensity scale , had ten degrees, and expanded on the descriptions in the Rossi Forel scale. 39. The earthquake was felt in San Juan with a maximum of VIII ( " Severe " ) on the Mercalli intensity scale . 40. Hazel was the most intense tropical cyclone of the season, peaking as a Category 5 on the Australian tropical cyclone intensity scale .
