Sysmographic or Seismographic: How To spell?

The word Sysmographic is misspelled against Seismographic, an adjective meaning "pertaining to a seismograph; indicated by a seismograph."

Word contains consecutive vowels 'EI' in between alphabets s & smographic is misspelled as 'Y'
Wrong Spelling:  s-y-smographic 
Correct Spelling:  s-ei-smographic 
Find more incorrect spellings of Seismographic to spell right way.