A 7.1 magnitude earthquake has hit Mexico, and people are posting terrifying photos and videos on social media.

A magnitude 7.1 earthquake struck near Mexico City on Tuesday.

A magnitude 7.1 earthquake struck near Mexico City on Tuesday.

A major earthquake rattled Mexico on Tuesday, and the damage appears to be severe.

The US Geological Survey said the earthquake was magnitude 7.1 and originated about 75 to 100 miles southeast of Mexico City. Dramatic shaking was reportedly felt throughout the metropolitan area, which is home to about 20 million people.

Based on the location and force of the quake, plus the size of local populations, the USGS’s earliest estimates suggest the number of fatalities is likely to be between 100 and 1,000. The economic impact, meanwhile, may range from $100 million to $1 billion, according to the USGS.

People on Twitter, Facebook, and other social-media platforms are posting photos and videos that they say show the disaster and its aftermath in and around Mexico City – fractured roadways, swaying and collapsing buildings, explosions, and more.

Below are some of the most striking examples.

Many of these posts were reshared by journalists based in Mexico, though most weren’t verified by Business Insider to be authentic or to be of Tuesday’s earthquake.

In many of the videos, a punctuated drone can be heard in the background – this is the city’s earthquake-alert system, which gives people about 60 to 90 seconds to scramble to a safe place.

The news director of the Spanish TV newscast Telediario, who’s based in Nuevo Leon, Mexico, shared this set of images.

Some videos posted on Twitter show buildings swaying.

via @KeithWalkerNews, images:@AlertaChiapas:Buildings rock back and forth as the earthquake strikes MexicoCity. pic.twitter.com/TFjQExGb4P

@KeithWalkerNews@AlertaChiapaspic.twitter.com/TFjQExGb4PSeptember19, 2017

Others show slabs of peeling and falling concrete. The name on the building in the footage below says “Servicio Nacional de Empleo, Coordinacion General” – part of the country’s National Employment Service in Mexico City.

Así se desploma edifico delServicio Nacional de Empleo en #CDMX tras #Sismo #ImágenesFuertespic.twitter.com/ECrJnn28VM

#CDMX#Sismo#ImágenesFuertespic.twitter.com/ECrJnn28VMSeptember19, 2017

Several videos, however, show entire structures collapsing.

Earthquake in Mexico City ðxÜ~pic.twitter.com/YUOT9QIlns

pic.twitter.com/YUOT9QIlnsSeptember19, 2017

In this clip of what appears to be a crumbling residential building, a woman can be heard saying “my God” repeatedly in Spanish.

#NSSxMinuto.Reportanfuertes daños en la ciudad de México; cae un edificio tras elsismo de este martes. pic.twitter.com/VXBKmkN6Hv

#NSSxMinutopic.twitter.com/VXBKmkN6HvSeptember19, 2017

This video shared by Milenio, a major newspaper in Mexico, shows the earthquake’s effects from inside the media outlet’s offices, ripping lighting fixtures from the ceiling.

Así se sintió el sismo en laredacción de https://t.co/yZhRO4eZHB pic.twitter.com/V4694bCDJT

https://t.co/yZhRO4eZHBpic.twitter.com/V4694bCDJTSeptember19, 2017

David Prager, a venture capitalist, said on Twitter that a friend recorded the clip below from a skyscraper in Mexico City. Clouds of dust and possibly smoke can be seen rising from the streets below.

Center of Mexico City rightnow after 7.4 earthquake. Scary. Hope folks are ok. Video shot by afriend in DF pic.twitter.com/tlYtpEShcB

pic.twitter.com/tlYtpEShcBSeptember19, 2017

Footage of fires and explosions that claims to show Mexico City was also posted on Twitter and other sites, but details about the situation are still emerging.

URGENTE | VIDEO -Impresionante explosión en México Central tras el poderoso sismode 7,1 de magnitud. Video cortesía #19Sep pic.twitter.com/FEq9GtvNHq

#19Seppic.twitter.com/FEq9GtvNHqSeptember19, 2017

Follow our latest coverage of Mexico’s earthquake here.