The National Network Stations of the Saudi Geological Survey (SGS) detected four earth tremors in Harat Al-Shaqah from 12 pm on Saturday to 12 pm today. The maximum tremor was 3.1 on the Richter scale. The depth of these tremors ranged from 6.5 km to 10.8 km. Also, SGS National Network Stations detected tens of earth tremors measuring less than 3 on the Richter scale. SGS is still monitoring the seismic activity.