Two weeks after a pair of earthquakes decimated cities in the nation’s north, experts are still trying to understand the seismic activity that led to the deaths of more than 3,500 people.By Avril SilvaWhen Antonio Machado Allison assisted with earthquake response efforts in Venezuela’s capital of Caracas in 1967, he felt confident in the way the government mobilized its teams. When he arrived, Allison described immediately seeing a plethora of state agencies onsite organizing rescue and salvage services, executing primary and emergency care and coordinating volunteers and the distribution of items like food and vaccines.