A second powerful earthquake has hit Papua New Guinea in as many days, amid an increase in seismic activity along the fringes of the Pacific, known as the "Ring of Fire"<br /> Tuesday's six-point-four magnitude tremor struck 142 kilometers southwest of the city of Mount Hagen at a depth of about 10 kilometers.<br />This led to a number of oil and gas operations to be closed due to damaged facilities, including that of energy giant ExxonMobil. <br /> Meanwhile, a six-point-one-magnitude quake jolted waters just off eastern Indonesia.<br />It struck at a depth of about 12 kilometers in an area 44 kilometers off the coast of Airbuaya.<br />No tsunami warning was issued. <br />
