This morning off the shore of Sumatra, Indonesia there have been three significant earthquakes. The first an 8.6, followed by a 6.0, and just less than an hour ago a 8.2. All three earthquakes have been in shallow depths if you consider most earthquakes. These no more than 24 miles under the surface and then one less than nine miles with mostly horizontal movement. The people seen leaving the building did not seem overly alarmed, but that may mean nothing really. Damages and tsunami have not been reported as of yet.
See links to the USGS site and CNN which has a video on people leaving a building after the quake.