The USGS downgrades the quake 's strength to a 7.1-magnitude . The tremor strikes over 150 kilometers off the coast of Ternate , Indonesia . A tsunami warning is in effect for parts of Indonesia, including Bali, Lombok and Sumbawa islands as well as several coastal cities on Java island. The quake struck at 10:31 a.m. local time at a depth of 35 kilometers ( 21.7 miles ) , according to the USGS , which initially called it a 7.3-magnitude quake . The quake did n't produce a tsunami , though minor sea level fluctuations are possible .
The USGS downgrades the quake 's strength to a 7.1-magnitude . The tremor strikes over 150 kilometers off the coast of Ternate , Indonesia . A tsunami warning is in effect for parts of Indonesia, including Bali, Lombok and Sumbawa islands as well as several coastal cities on Java island. The quake did n't produce a tsunami , though minor sea level fluctuations are possible .