The "bwoop, bwoop, bwoop!" of cell-phone earthquake alerts is enough to scare the bejeezus out of most people in the near vicinity, especially anyone who experienced the March 11 Tohoku-Kanto quake. A fantastic invention that beams info from Japan's Meterological agency directly to your phone, the service can predict the occurrence of an earthquake from a few seconds up to a minute in advance. But does it have to be so damned terrifying? The makers of apps for Android and iPhones clearly think not.

Yurekuru kooru (tremor's coming call) for the iPhone, available on iTunes, tinkles urgently (see video above) to announce the arrival of a tremor. Since the big one hit last month, followed by innumerable tremors, subscribers to the service have multiplied tenfold and downloads have now broken the 1 million mark: Testament to the popularity of the iPhone and to the feelings of uneasiness most Japanese are experiencing at the moment.