Double Quake Unleashed Caracas Destruction

A severe earthquake doublet, separated by mere seconds, struck Venezuela's coast and capital, Caracas, on June 24. The powerful seismic event, comprising a 7.2 magnitude followed by a 7.5 magnitude quake, caused devastating destruction. The rupture propagated eastward along the San Sebastián fault, directly towards densely populated regions, including Caracas.

This quake sequence was particularly deadly due to a confluence of factors. Scientists identified the doublet as a primary cause of prolonged, chaotic shaking. Furthermore, the shallow depth of the temblors, originating just six miles below the surface, amplified the intensity of shaking felt on the ground.

Many affected areas, including coastal cities like La Guaira and Catia La Mar, are built on soft, sedimentary ground. This type of soil amplifies seismic waves, similar to how soft sediment amplifies sound. This amplification, combined with the directivity effect which likely intensified shaking towards Caracas, significantly contributed to the widespread collapse of over 400 buildings and damage to hundreds more.

Engineers note that while Venezuela has robust seismic codes, the scale of destruction suggests potential non-compliance in some constructions. Older buildings predating recent code upgrades may also have contributed to the high number of collapses. While many structures were lost, some remaining standing allowed for resident escape, indicating a possible prioritization of human survival in building design.