A strong earthquake struck the southwestern Chinese province of Sichuan on Saturday, killing more than 30 people and injuring hundreds of others, local authorities said on April 20th 2013. The quake struck Ya'an just after 8 a.m. local time about 115 kilometers (70 miles) away from the provincial capital, Chengdu, at a depth of around 12 kilometers, according to the U.S. Geological Survey. There was conflicting information about the earthquake's strength, with the USGS putting the magnitude at 6.6 and the China Earthquake Networks Center gauging  it at 7.0. Earthquakes happen without warning. They can happen any time of a day, at any point during the year. When an earthquake is happening, you should know what you should do or not do. Do NOT go outside. You could get injured from falling glass or parts of buildings. If you are outside, stay away from buildings and power lines. Stay under a desk, table, or other strong furniture. Hold on to it. Or stay in a corner of the building. Cover your face and head with your arms and cover your mouth with a towel or clothing. Stay inside until shaking stops and it is safe to go outside. Keep away from pictures or advertisements on the wall or the building, and anything else that could fall and hurt you. Most people get injured by falling things during an earthquake, not by the shaking itself. Also keep away from a fire. You could fall down and burn yourself on the fire. If you are driving when an earthquake happens, stop the car if it's safe. Stay inside your car until the earthquake stops, and don't drive near bridges. Try not to stop by power lines or trees. These could fall and hurt you. From this passage,about the earthquake on Saturday, we know   _  .
the earthquake's strength is 7.0 according to the USGS's information the earthquake is 115 miles away from the provincial capital, Chengdu the earthquake killed hundreds of the locals the earthquake struck Ya'an about 12 kilometers in depth