The quake's epicenter was 33 miles northeast of Pinotepa, in Oaxaca State.
Five women, four men, and the three children were among the dead when the military helicopter went down late on Friday.
Around 50 homes in the southern state of Oaxaca were damaged. The two officials were unharmed.
About 100 000 people in Oaxaca had lost power, the state's governor said.
The helicopter was attempting an emergency landing when its tail hit a van, Mr Navarette said, adding that several people were injured.
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Gladys Barreno Castro was at work on the 29th floor of a downtown office building in Mexico City, but recognized quickly that the shaking was not as violent this time. Less than an hour after the tremors, the volcano emitted a 700-meter high column of water vapor and ash.
The quake gave way to more than 225 aftershocks, the national seismology service said, and caused widespread panic.
The crash followed a magnitude 7.2 quake that left almost a million homes and businesses without electricity, including in Mexico City, and damaged at least 50 homes in Oaxaca, Reuters reported.
"Are we ok? We are very frightened!"
Australian teacher Benjamin Reid, who is working at an worldwide school in Mexico City, said he was running up the stairs of his 10-storey apartment building when the tremors struck and he initially dismissed them as dizziness from the exercise.
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Regional leaders have expressed their solidarity with the people of Mexico.
The accident occurred during an inspection flight of earthquake-affected areas, as the country was hit by a 7.2-magnitude quake, earlier in the day.
Oxfam received 31.7 million pounds ($43.8 million) from the British government in 2016-17, out of some 400 million pounds in total income. "Our solidarity with you Mexican brothers!"
Mexican President Enrique Peña Nieto tweeted that the natural disaster was northeast of Pinotepa Nacional, in Oaxaca, and that "protocols have been activated". "We are attentive to the reports of the natural disaster registered in Oaxaca".
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The idea on meeting with North Korea has been rejected by Washington for months, as the New York Times reported . According to the Times , Pence's diplomatic message was also off-key, in contrast to the lovely Ms.