The Saudi Geological Survey (SGS) said that the National Network Stations detected four earth tremors in Harat Al-Shaqah. "The maximum tremor was 3.7 on the Richter scale. The depth of these tremors ranged from 5.0 km to 8.9 km", SGS added. SGS also said the earth tremors occurred from 12 pm on Saturday to 12 pm today, adding that a number of tremors measuring less than 3 on the Richter scale were detected.