The tremors - possibly aftershocks from a massive 8.2-magnitude quake that hit southern Mexico two weeks ago - forced rescue workers in the capital to pause their efforts for a couple of hours.
Some workers at Mexico City's police headquarters are refusing to return to work at the downtown building because of suspected structural damage.
There is no aid and no media in the area, according to Anthony Hoffman, a Canadian expat living in the heart of Mexico City in the Colonia Roma neighborhood.
Pereda said she didn't want to leave: "I was anxious about him".
Mexico's capital was shattered by Tuesday's magnitude 7.1 quake that flattened dozens of buildings and killed at least 307 people.
Almost a week after the deadly 7.1 magnitude natural disaster, the hulking wreckage of what used to be a seven-storey building in Mexico City is among the few sites where searchers still hold hope someone could be trapped alive.
"I remember them as such a united, loving couple", said Juan Carlos Williams, their nephew.
The quake that killed almost 300 people and destroyed dozens of buildings in Mexico set off a frantic response in communities around the United States as people desperately try to connect with their loved ones, figure out ways to send emergency help, money, and goods as well as raise funds for smaller towns around the capital they say are receiving less help from the government.
On a poster in front of a collapsed office block where several people were trapped by the quake, a picture of one of those inside read: "Adrian, you are a warrior". One of the buildings that collapsed in the quake housed a business listed as Asia Jenny Importaciones, S.A.de C.V.
The government's response to Tuesday's quake, which killed 319 people in Mexico City and surrounding states, is under scrutiny ahead of presidential elections next year. "Everytime Frida's help is needed, we show up to deal with the situation", said Arauz.
It is the moments between those bits of information that torment the families.
"The families are still hopeful, but we psychologists are starting to prepare ourselves to counsel them in the context of mourning", said Penelope Exzacarias. Global teams include an urban search-and-rescue team from the Los Angeles Fire Department, known as USA-2 as well as members of Japan's Disaster Relief (JDR) Search and Rescue Team, both of which have been dispatched to Mexico City to help with recovery efforts.
"We are getting used to this", Pereda said.