We present a method for visualizing the pattern which we believe to be a pr
ecursor signature of financial crashes (or ruptures). The log-periodicity o
f the pattern is investigated through the envelope function technique. Thre
e periods of the Dow Jones Industrial Average (DJIA) are investigated: 1982
-1987, 1992-1997 and 1993-1998. The presence of a rupture in the end of 199
8 is outlined from data taken before the end of August 1998.