In 1969 I was working in Gibralter and staying at a newly-built hotel in Sandy Bay, which lies at the foot of the water catchment area on the steep Eastern face of the Rock, facing into the Mediterranean.
At around 3 o'clock one morning in November or December I dreamt that I was standing in a railway station, and that an express train was approaching. The distant hint of a rumble rose to a quite deafening roar and the platform shook violently as the train hurtled by. In my dream I stood and watched it vanish into the night, and the dream was so real that I awoke and got out of bed.
When I opened the balcony door, intending to step outside for a breath of fresh air, a shower of stones and small pieces of concrete began to cascade down onto the roofs and balconies below. The 'rainfall', lasted for perhaps three or four minutes.
That was my one and only, and hopefully last ever, experience of an earth tremor, and where the epicentre was I have never been able to find out.