Earthquake Shakes Mexico City

MEXICO CITY (AP) - A seemingly strong earthquake is shaking Mexico's capital.

There is no immediate word of damage or casualties. US Geological Survey says Mexico quake had magnitude 7.5.

Mexico City is vulnerable even to distant earthquakes because much of it sits atop the muddy sediments of drained lake beds that quiver as quake waves hit.

The magnitude-8.1 quake in 1985 that killed at least 6,000 people and destroyed many buildings in Mexico City was centered 250 miles away on the Pacific Coast.