Disaster agency spokesman Sutopo Purwo Nugroho said 168 deaths have been confirmed so far and another 30 people are missing. Also, 745 were injured. He said those numbers may still rise since not all affected areas have been reached.
Footage posted on social media showed a pop band named "Seventeen" performing for employees from a local electric company under a tent on a beach as dozens of people sat listening at tables covered in white cloths.
As bright strobe lights flashed on stage, a child could be seen wandering through the crowd. Then, as the second song was about to begin with the drummer pounding, the stage suddenly heaved forward, throwing the band and all their equipment into the audience.
The worst affected area was the Pandeglang region of Banten province in Java, which encompasses the Ujung Kulon National Park and popular beaches, the disaster agency said.
Saturday's tsunami triggered memories for some of the massive 9.1-magnitude earthquake that hit on December 26, 2004. It spawned a giant tsunami off Sumatra island in western Indonesia, killing more than 230,000 people in a dozen countries — the majority in Indonesia.
The vast archipelago of more than 17,000 islands home to 260 million people. Roads and infrastructure are poor in many areas, making access difficult in the best of conditions.