A magnitude 7.3 earthquake in northeastern Indonesia left one person dead and four injured when it rattled buildings, causing panicked residents to flee homes, churches and shopping malls, officials and witnesses said Monday. The woman who died suffered a heart attack, apparently triggered by the shock of Sunday's powerful quake, and one of those hurt broke his leg after jumping from the fourth floor of a building. The quake struck 10 kilometers beneath the Molucca Sea and was centered 2,200 kilometers northeast of the national capital, Jakarta, the USGS said. The Indonesian seismological institute also issued a tsunami alert via television and radio, but the feared wave never came. The alert however sent hundreds racing inland to higher ground causing massive traffic jams, witnesses said. Indonesia, the world's largest archipelago, is prone to seismic upheaval due to its location on the so-called Pacific "Ring of Fire," an arc of volcanos and fault lines encircling the Pacific Basin.