11.   Each of the worst-case scenarios is modeled on an existing fault system where a large earthquake has occurred in the past.

12.   Earthquakes occur when two plates grind and scrape against each other at a fault line.

13.   If the predicted earthquake did not occur, Mogi said, the public backlash would kill the earthquake prediction program.

14.   If it is a fault, then an earthquake might occur along its length.

15.   In regions of weak rock, small earthquakes occur frequently.

16.   Recent California earthquakes have occurred most often in September and least often in April, possibly because of seasonal changes in air pressure, scientists suggest.

17.   Scientists said there is no way to tell where or when the next earthquake will occur.

18.   Small earthquakes are occurring regularly in the region, although most are too small to be felt.

19.   Since the earthquake occurred, Kusudo has been sitting on the floor of a city ward office covered by blankets.

20.   The study is not meant to predict earthquakes, he said, but figure out how much an area would be shaken if an earthquake occurred.