At least 230 people have died after a A 7.1-magnitude earthquake struck southern Mexico on Tuesday, 123km from the capital Mexico City.
This was the second major earthquake to hit Mexico in two weeks. The quake struck 32 years to the day after a 1985 earthquake which killed thousands.
U.S. President Donald Trump called his Mexican counterpart President Enrique Pena Nieto to offer his condolences.
Bongani Bingwa spoke to Dr Herman Van Niekerk, Structural Geologist at the University of Johannesburg.
Van Niekerk explains why the area is prone to earthquakes.
It is probably due to a build up of stresses in the earth's crust but it was what we refer to as a normal faulting earthquake.— Dr Herman Van Niekerk, Structural Geologist at UJ
The problem is that Mexico City is built on an ancient lake so the sediment below Mexico City is easily fluidised in case of an earthquake and therefore it will always suffer a lot of damage.— Dr Herman Van Niekerk, Structural Geologist at UJ
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