[1] Is it irresponsible to put suggestions like these in print? Perhaps. A few years ago I turned down an assignment from an American magazine to speculate on possible terrorist attacks, because I was afraid someone would act on my suggestions. I don't apologize for the ideas I list here because they are so obvious that I assume that most terrorist organizations must have already thought of them.

[2] David Keys, Catastrophe, Century Books Ltd, London, 1999

[3] www.usgs.gov/yvo. Also search the site for "caldera" and "Long Valley."

[4] "US geologists call for better monitoring of volcanoes before disaster strikes." National Post May 3/05, pg A17.

[5] "Four days that shook the world," New Scientist, May 8/04, pg 33.

[6] For this information I searched 'tsunami AND Canary AND Island' on Google. The query produced 35,000 hits. See also Scott Stinson, "Scientist fears east coast tsunami," National Post Aug 10/04, pg A3.

[7] Peter Cervelli, "The Threat of Silent Earthquakes," Scientific American, Mar/04, pp 58-63.

[8] Ken MacQueen, "When B.C. gets hit," Maclean's May 16/05, pp 34-43.

[9] www.USgovinfo.about.comcerro grande fire.

[10] Steven Edwards and Araminta Wordsworth, "Will donors pay up?" National Post, Toronto, Jan 4/05, pg A1.

[11] Morton Deutsch and Robert Krause, "The effect of threat upon interpersonal bargaining," Journal of Abnormal and Social Psychology, 1960, Vol 61 No 2, pp 181-189.