Earthquake magnitude

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Across
  1. 4. does the mercalli scale have a mathematical basis?
  2. 5. how many measures of earthquake size
  3. 6. a scale which measures earthquakes beginning with M
  4. 8. the mercalli scale is a measure of ?
  5. 11. boxing day quake and tsunami in 2004 was a
  6. 12. is the mercalli scale objective or subjective
  7. 14. how many levels of increasing intensity does the mercalli scale have
Down
  1. 1. each unit has a _ _ _ _ _ _ _ increase in strength
  2. 2. magnitude is expressed in _ _ _ _ _ numbers and decimal fractions
  3. 3. the richter scale is L_ _ _ _ _ _ _ _ _ _
  4. 6. the richter scale measures what?
  5. 7. there is a thirtyfold increase in _ _ _ _ _ _ released
  6. 9. a scale which measures eathquakes beginning with R
  7. 10. the mercalli scale is an arbitrary ranking based on ?
  8. 13. largest earthquake ever recorded was a 9.5 in _ _ _ _ _ in 1960