It also matters what kind of soil the earth quake is centered in.  Bay fill in San Francisco shook like a bowl full of jelly in 1989, other areas were damaged less.  Clay soil in my part of the country tends to radiate the waves further than most western soils; the New Madrid quake in the early 19th century was felt as far away as New York.  I once was startled to hear your g-grandmother Ola Marr comment quite matter of factly that the San Francisco earthquake was "quite a jolt," as if she had experienced it herself while living in Del Rio, Texas, a mere 1,600 miles or so away.  It didn't occur to me to ask her exactly what she experienced.  Mostly I'm just glad your earthquake neither hurt nor unduly frightened you.