7 Riskiest Cities Vulnerable to Earthquake

Quito, Ecuador: South American country’s capital, Quito is uniquely situated among one of the highest densities of active volcanoes in the world. It is also the site of many powerful earthquakes through the years and suffers one of its worst when an earthquake kills 5,000 people and destroys some of the most famous buildings in South America in 1859.

Following this disaster, Quito was not hit again by a major earthquake until August 1949, when a tremor in the south of the city killed 6,000 and left 100,000 people homeless. A magnitude of 6.0 earthquakes could kill an estimated 15,000 of the city's population.
Quito is the only city in the world where there is a threat of two major natural calamities like earthquake and volcanoes.

Manila, Philippines: A densely populated island capital, Manila lies on the edge of the Pacific's Ring of Fire, a seismic hot zone that encircles the ocean. Over the last century, many earthquakes rated above magnitude 6.0 have wracked the volcanic prone Philippines. A direct hit of tremor from a seismic event would do innumerable damages to this compact city of 15 square miles which is a home to more than 1.5 million people. Over 13,000 lives are at great risk if such calamity hits this city.
Based on studies by Phivolcs and the U.S. Geological Services, the next big quake to hit Manila would be between magnitude 6 and 7.