New Delhi, July 30 -- A powerful earthquake, initially reported at magnitude 8.0 and later upgraded to 8.8, struck off Russia's sparsely populated Far East early on Wednesday (8:25 AM Japan time). The quake, centered approximately 119-120 kilometers (74-75 miles) east-southeast of Petropavlovsk-Kamchatsky on the Kamchatka Peninsula, occurred at a shallow depth of 19.3 to 21 kilometers (12-13 miles). This event marks the strongest worldwide since 2011 and the most powerful in Russia since 1952, according to the US Geological Survey. Multiple aftershocks, some as strong as magnitude 6.9, followed the main tremor.Here is a 10-point report on the earthquake off Russia's Kamchatka Peninsula and the subsequent tsunami events:

2. Tsunami alerts...