Deadline (1982)

"Deadline" is a 1982 Thriller movie directed by Arch Nicholson and starring by Barry Newman, Bill Kerr. A journalist sets out to report on a minor earthquake in the Australian outback, and finds that the tremor was a result of a small nuclear explosion - part of an extortion threat that has the government fearing nuclear blackmail. With the help of local reporters, and despite the harassment of the security agencies, he sets out to avert the crisis.