21. An earth tremor triggered the rockfall 1.3 miles below the surface on Monday, trapping the 15 miners. 22. When it blew up, the explosion caused earth tremors measuring 3 . 4 on the Richter scale. 23. Strong winds and earth tremors devastate Phoenix. 24. Seismologists often use the amount and intensity of earth tremors in judging the severity of volcanic events. 25. Residents of Manchester felt the ground shake for a second day Tuesday with a series of earth tremors . 26. Only one hotel, the 25-year-old Ganei Shulamit, had to be evacuated following the main earth tremor on Wednesday. 27. Other reports said the train cars were set in motion by earth tremors , which are common in Iran. 28. A minor earth tremor shook Belgium and parts of northern France in the early hours of Tuesday morning. 29. Suggested causes for these include slumping, earth tremors and fault-movements, trapped water or gases and volcanic bomb impacts. 30. Regina returns and they activate the gate, but a sudden earth tremor leaves Paula trapped by falling equipment.
