A strong earthquake hit Mexico City today with a magnitude of 7.4, but no immediate reports of serious damage or injuries have come in.

The quake is reported to have originated around the state of Guerrero and sent tremors to Acapulco and Oaxaca which varied in strength. Some minor damage was reported to buildings in Mexico City and some residents lost phone service, according to Mayor Marcelo Ebrard, who tweeted about the natural disaster. Residents fear aftershocks and will be on guard now.

Mexico City is built on unstable ground made mostly of volcanic structures and is susceptible to earthquakes and eruptions. In 2011 the Popocatepetl volcano erupted, causing an evacuation.

Twitter has been abuzz with the news.