a magnitude-8.2 quake a remarkably low toll for such a powerful shift in the Earth's crust.President Michelle Bachelet declared a state of emergency and was reviewing the damage in Iquique, a northern coastal city of nearly 200,000 people near where the quake struck in the Pacific Ocean. A planeload of 100 anti-riot police was deployed along with 300 soldiers to prevent looting and round up escaped prisoners.Photos: Chile earthquake triggers tsunami alertsThousands of people evacuated from low-lying areas were returning home after a spending a long night outside due to the threat of a tsunami. The government's mandatory order to leave the coast was spread through cellphone text messages and Twitter, and reinforced by blaring sirens in neighborhoods where people regularly practice earthquake drills.The tsunami lifted fishing boats onto city streets and sunk others in the port of Iquique, but no other major damage from the sea was apparent. Chile's entire coast was initially subject to the mandatory evacuation order, which lasted nearly 10 hours in coastal communitiesclosest to the offshore epicenter.The shaking that began at 8:46 p.m. Tuesday also touched off landslides that blocked roads, knocked out power for thousands, damaged an airport and started fires that destroyed several businesses. Some homes made of adobe were destroyed in Arica, another city close to the quake's offshore epicenter.Shaky cellphone videos taken by people eating dinner show light fixtures swaying, furniture shaking and people running to safety, pulling their children under restaurant tables, running for the exits and shouting to turn off natural gas connections.Reuters: StringerPeople are evacuated from their shelter after a tsunami alarm at Antofagasta city, north of Santiago on the southern Pacific coast, April 1, 2014.Mining in Chile, which is the world's top copper producing nation, was not affected, althoughworld prices for the red metal jumped as the quake raised supply concerns because most of the Chilean mining industry is in the northern regions.About 300 inmates escaped from a women's prison in the city of Iquique, forcing the closure of the border with Peru. Several dozen were quickly captured, officials said.Bachelet, who just returned to the presidency three weeks ago, waited five hours after the quake struck to address her nation. It was not lost on many Chileans that the last time she presided over a major quake, days before the end of her 2006-10 term, her emergency preparedness office prematurely waved off a tsunami danger. Most of the 500 dead from that magnitude-8.8 tremor survived the shaking, only to be caught in killer waves in a disaster that destroyed 220,000 homes and washed away large parts of many coastal communities."The country has done a good job of confronting the emergency. I call on everyone to stay calm and follow the authorities' instructions," Bachelet tweeted after Tuesday night's temblor.Reuters: Cristian ViveroA military convoy travels along a road after a tsunami alarm at Iquique city, north of Santiago on the southern Pacific coast, April 1, 2014.She put her interior minister in direct charge of coordinating the emergency response, and announced that schools would be suspended in evacuated areas while authorities assessed