The 2010 Haiti earthquake that killed over 200,000 people was caused by movement along the boundary between the Caribbean and North American tectonic plates. Haiti sits along a conservative plate boundary where the plates move about 20 mm per year, building pressure until an earthquake occurs. A 7 magnitude earthquake struck just 15 km from the capital Port-au-Prince on January 12, 2010. The shallow depth of 13 km exacerbated the damage. Over 1.5 million people were left homeless as much of Port-au-Prince was destroyed, including important buildings and infrastructure. The poor conditions in Haiti made providing relief extremely difficult in the aftermath.