HC Deb 09 December 1986 vol 107 c147W
Mr. Strang

asked the Secretary of State for Defence how many nuclear weapon tests by (a) the United States of America, (b) France and (c) China have been recorded by his Department so far in 1986.

Mr. Archie Hamilton

One of Her Majesty's Government's principal objections to a comprehensive test ban treaty is the lack of an effective procedure to discriminate between small natural seismic events, chemical explosions and nuclear explosions. It is consequently not possible to say how many of the seismograms recorded by MOD are produced as a consequence of nuclear weapons tests.