Indonesians Feel Lucky After Escape From Quakes Residents surveying damage from two powerful earthquakes that awoke memories of the devastating 2004 Indian Ocean tsunami said Thursday they could hardly believe their luck. Five people died from heart attacks in Indonesia's westernmost province of Aceh - closest to the epicenter of Wednesday's temblors - and several others were injured as they tried to flee to high ground. But aside from a few cracks in the walls of houses and structural damage to one bridge, residents said it almost felt like nothing had happened. "I really feel my prayers were answered," said Usman Basyah, 45, who lost one of his sons the 2004 disaster that killed 170,000 people in Aceh alone. I'm so grateful. "We've gone through enough trauma already," he said as he handed change to customers at his small street stall. Rahmi Novianti, a 25-year-old housewife who lives just outside the provincial capital, agreed. "Yesterday, as I was running out of my house, I could see the tsunami coming in my mind, the entire village again being destroyed," she said. That it didn't happen really feels like a blessing. A security officer walks through debris from Wednesday's strong earthquake at an office building in Banda Aceh, Aceh province, Sumatra island, Indonesia, Thursday, April 12, 2012. Cries of panic and fervent prayers rang out Wednesday as Indonesians rushed toward high ground after two strong earthquakes raised fears of a killer tsunami. (AP Photo/Heri Juanda) Close Indonesia, a sprawling archipelagic nation of 240 million people, straddles a series of fault lines that makes it one of the most seismically active places on the planet. Aceh, which sit off a subduction zone fault, were one tectonic plate of the Earth's crust dives under another, has experienced numerous "mega thrust" quakes over time. It's these temblors that cause the seabed to rise or drop vertically, sometimes by five or 10 meters (yards), displacing massive amounts of water that race across the ocean at jetliner speeds. But experts say Wednesday's 8.6-magnitude quake and the 8.2-magnitude aftershock occurred on what is known as a "strike-slip" fault. The sea floor shifted horizontally, creating more of a vibration in the water. As result, the only wave generated was less than 80 centimeters (30 inches) high. Though the shaking on land was fierce, lasting nearly four minutes and triggering mass panic, only five people died, Asmadi Syam, head of Aceh's disaster management agency, told MetroTV. "All from heart attacks," he added. At least four other people were injured. The power of the quakes triggered a tsunami watch in countries all along the Indian Ocean, from Australia and Pakistan all the way to Africa. Recalling the 2004 disaster that killed 230,000 people in nearly a dozen nations, sirens sounded along coastlines and warnings spread like wildfire by mobile phone text messaging. Evacuations began immediately.