On Sunday, a strong earthquake hit most of Taiwan. It knocked down a three-story building, stranded about 400 tourists on a mountainside, and caused part of a passenger train to go off the tracks. Right away, no serious injuries were reported. The 6.8-magnitude quake was the biggest of many that have shaken the island’s southeast coast since a 6.4-magnitude quake hit the same area on Saturday night. Most of the damage seems to be north of the epicenter, which the Taiwan Central Bureau of Meteorology said was in the town of Chishang at a relatively shallow depth of 7 kilometers (4 miles).