IQUIQUE, Chile —
The largest aftershock was felt across the border in southern Peru, where people in the cities of Tacna and Arequipa fled buildings in fear. Police Lt. Freddy Cuela in Tacna said no damage or injuries were reported. Peru's navy tweeted a tsunami alert for the country's extreme southern coast, which is next to the Chilean region hit by the quakes.
Authorities have reported six deaths, but didn't rule out the possibility others could have been killed in older structures made of adobe in remote communities that weren't immediately accessible.
The tsunami after Tuesday night's quake caused the sea to rise only 8 feet (2.5 meters) in Iquique, but that was enough to sink and damage many fishing boats, lifting some onto city streets and piling others up in the harbor.
Still, as Bachelet deployed hundreds of anti-riot police and soldiers to prevent looting and round up escaped prisoners, it was clear the loss of life and property could have been much worse.
The mandatory evacuations have been announced through cellphone text messages and Twitter, and reinforced by blaring sirens in neighborhoods where people regularly practice earthquake drills. But many Chileans have not downloaded the smartphone application that can alert them to evacuation orders, and some communities still lack warning sirens.
Chile is one of the world's most earthquake-prone countries, and tsunamis are a particular danger because the fault zone lies just offshore, where the Nazca tectonic plate plunges beneath the South American plate.
Associated Press writers Eva Vergara in Santiago, Michael Warren in Buenos Aires, Argentina; Frank Bajak in Lima, Peru, and Andrew Dalton in Los Angeles contributed to this report.