A hammer blow or small explosive (black powder) are typically used for the seismic source.

One of the signals recorded corresponded in azimuth, or direction, and time to an avalanche that the researchers set off by using small explosives.

We figure they'll depend on small explosives, and maybe gas.

We passed a small explosive through whenever they were used.

Numerous small explosives, strategically placed within the structure, are used to catalyze the collapse.

They were just like arrows but had small explosives attached to the back, and were fired in swarms.

The rover was held inside the lander by bolts and special nuts that were released after landing with small explosives.

Testing for stability often involves the use of small explosives.

"They have a small explosive in them," Gabriel said.

"I attached a small explosive to the artifact, Captain," Tuvok said.