File photo shows Hotel Regis in Mexico City collapsing.
The Hotel Regis in Mexico City's central Alameda park square collapses after an earthquake in this September 19, 1985 file photo. The 1985 Mexico City earthquake, measuring a giddy 8.1 on the Richter scale, caught Mexico off guard, killing thousands as it toppled housing blocks and office buildings in a city built on the soft mud left by a dried-up pre-Hispanic lake.Some 12,000 people are believed to have died in this earthquake, with another 40,000 injured. President Vicente Fox will host a memorial service on September 19, 2005 for the victims as the country marks the quake's 20th anniversary. REUTERS/Daniel Aguilar/File DA/VP