People Can Cause Earthquakes:
A National Geographic article says a powerful Australian earthquake was triggered by too much coal mining. The 1989 quake, whose epicenter was Newcastle, New South Wales, killed 13 people and caused $3.5 billion damage (talk about coals to Newcastle). The piece details more than 200 human-caused quakes. In Wired Science.
I remember the day this occurred, mostly because it was the first earthquake I felt in Sydney. The first time I experienced an earthquake was while family and I were on holidays in Turkey. Apparently there was a mad scramble, everybody was up, except me who was sound asleep.