Satellite predictions are still far from being real-time warning system, with days or weeks passing between measurements. Still, keeping an eye on seismicity, gas emissions, and changes in the shape and movement of the ground, have led to some successful predictions and evacuations. In 1991, Mount Pinatubo in the Philippines, which had been quiet for nearly 500 years came to life, trembling, then venting steam. Careful analysis of the mountain led to the evacuation of over 60,000 people before it erupted. In 2010, monitoring of activity at Indonesia's Mount Merapi led to 70,000 people being evacuated before the volcano erupted. In each case, hundreds died (840 at Pinatubo, 350 at Merapi) but without the evacuations, the death toll could have been far worse.