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Five other planeloads of aid were supposed to arrive by Tuesday night.

Brazilian President Luiz Inacio Lula da Silva visited Chile on Monday. He said a first planeload of aid would arrive Tuesday, followed later by a full army field hospital.

Peru, too, said it was sending in a hospital and doctors with 15 tons of blankets and tents.

Little destruction was visible from the air as Mrs. Clinton’s plane descended. At the airport itself, pallets of various types of assistance were stacked in front of some hangars, and one military transport plane landed shortly after Mrs. Clinton’s U.S. Air Force jet.

“I come with the great sympathy and support of President Obama and the American people,” Mrs. Clinton said in Santiago.

She noted that the quake, which has killed more than 700 people, was 800 times more powerful than the one that leveled much of the Haitian capital of Port-au-Prince in January.

Chile, which lies along a major fault line, prides itself on engineering expertise in the design and construction of buildings and other infrastructure that can withstand quakes. The country sent some of its top earthquake specialists to Haiti following the quake there.

Mrs. Clinton said the Chilean government is responding with “resilience and strength.”

Before the weekend quake struck, Mrs. Clinton had planned a longer stay in Chile, but she now will spend only a few hours there before heading to Brazil. Mrs. Clinton is in the midst of a weeklong, six-nation tour of Latin America that already has taken her to Uruguay and Argentina.

Santiago is the second major earthquake zone Mr. Clinton has visited in the past two months. Four days after the Haitian earthquake, she was on the ground at the Port-au-Prince airport, meeting with Haitian officials and assessing damage with disaster relief experts.

In addition, since she became secretary of state, Mrs. Clinton has been present in at least three foreign countries — Honduras, Japan and Pakistan — when they were struck by quakes or strong aftershocks.