They were the strongest quakes to affect the city since 1906.

There was no historic record of such a strong quake in Mexico.

The job was barely finished when the strong second quake stuck.

So why does it sometimes seem like there's a string of strong quakes throughout a region?

In 1977, another strong quake ruptured oil fields in the area.

This strong quake destroyed all the churches and many of the factories in the area.

That will hold the bars together, even in a strong quake.

In a strong quake, be prepared to seek a safe spot immediately.

A stronger quake early on Thursday brought their homes down.

It too was followed by a number of strong and medium quakes days after with the magnitude ranging from 4.3 to 5.0.