try this
db2 -x "select 'drop sequence '||SEQSCHEMA||'.'||SEQNAME||';' from syscat.sequences where seqschema = 'schemaname' " > drop_seq.sql
this will create script for you on drop_seq.sql after this
db2 -tvf drop_seq.sql -z drop_seq.out
will drop all the seq on tht schema
regds
paul