By PETER ORSI, MARIA VERZA and GISELA SALOMON
MEXICO CITY — A strong new earthquake shook Mexico on Saturday, causing new alarm in a country reeling from two yet-more-powerful quakes this month that have killed nearly 400 people.
The U.S. Geological Survey said the new, magnitude 6.1 temblor was centered about 11 milesouth-southeast of Matias Romero in the state of Oaxaca, which was the region most battered by a magnitude 8.1 quake on Sept. 7.
It was among thousands of aftershocks recorded in the wake of that earlier quake, the most powerful to hit Mexico in 32 years, which killed at least 90 people.
There were some early reports of damage in Oaxaca. Milenio TV broadcast images of a bridge that partially collapsed.
Bettina Cruz, a resident of Juchitan, Oaxaca, said by phone with her voice still shaking that the new quake felt “horrible.”
“Homes that were still standing just fell down,” Cruz said. “It’s hard. We are all in the streets.”
Cruz belongs to a social collective and said that when the new shaking began, she was riding in a truck carrying supplies to victims of the earlier quake.
Nataniel Hernandez said by phone from Tonala, in the southern state of Chiapas, which was also hit hard by the earlier quake, that it was one of the strongest movements he has felt since then.
“Since Sept. 7 it has not stopped shaking,” Hernandez.
U.S. Geological Survey geophysicist Paul Caruso said the new temblor was an aftershock of the 8.1 quake, and after a jolt of that size even buildings left standing can be more vulnerable.
“So a smaller earthquake can cause the damaged buildings to fail,” Caruso said.
Buildings and street signs swayed and seismic alarms sounded in Mexico City, prompting people with fresh memories of Tuesday’s magnitude 7.1 temblor that has killed at least 295 across the region to flee homes and hotels. Some were in tears.
Alejandra Castellanos was on the second floor of a hotel in a central neighborhood and ran down the stairs and outside with her husband.
“I was frightened because I thought, not again!” Castellanos said.
Mexico City Mayor Miguel Angel Mancera told Milenio TV there were “no new developments” due to the quake, though he acknowledged that it provoked “some crises of nerves” among capital residents.
At the site of an office building that collapsed Tuesday and where an around-the-clock search for survivors was still ongoing, rescuers briefly evacuated from atop the pile of rubble before…