Two concentrated heat sources move through a one-dimensional reactive-diffu
sive medium. The sources, moving at constant speed in the same direction, a
re separated by a fixed distance. The leading source serves to preheat the
medium ahead of the trailing source. Sufficient conditions, involving the s
peed and the separation distance, are found for blow-up at the site of the
trailing source. Also, the asymptotic behavior of the solution near blow-up
is examined. Mathematics Subject Classification (1991). 35K60, 45D05, 45M0
5.