The strongest quake, a M5.1 tremor, killed at least a person and injured several others on April 10, 2017.
So far, one person is reported dead and three others have been injured after the collapse of abig chunk of rock on the Los Chorros road.
The largest earthquake of this seismic swarm in the municipality of Antiguo Cuscatlan, a M5.1 earthquake, occurred at 5:52 pm local time, 2.5 miles deep, with its epicenter about 6.5 miles west of San Salvador.
The Director General of Civil Protection Jorge Antonio Melendez Lopez has ssued a yellow alert for all of El Salvador because of the continued and increasing seismic activity.
The agency asked the population to remain calm as seismicity is expected to continue over the next few days and weeks.
On social media, users reported landslides and rocks falling following the strongest quake.
The swarm of earthquakes has also damaged homes and offices in Santa Tecla and Antiguo Cuscatlan, with up to 130 aftershocks reported.