Sismographic or Seismographic: How To spell?

The word Sismographic 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 'I' as letter 'E' is phonetically ig
Wrong Spelling:  s-i-smographic 
Correct Spelling:  s-ei-smographic 
Find more incorrect spellings of Seismographic to spell right way.