Sri Lanka, Aug. 5 -- Fresh tremor of magnitude 5.1 struck far-east in Petropavlovsk-Kamchatsky, Russia today, reported the US Geological Survey (USGS).

The tremor was recorded at 07:17:36 (UTC+05:30), with its epicentre located 144 km southeast of the Kamchatsky region at a depth of 25 km.

Tremor follows a powerful 8.8-magnitude earthquake that struck near Russia's Kamchatka Peninsula earlier in the week.

According to experts, the quake was caused by intense tectonic activity along a major subduction zone where the Pacific Plate slides beneath the Okhotsk Plate. This zone lies within the Pacific "Ring of Fire," a seismically active belt notorious for frequent earthquakes and volcanic eruptions.

The vertical displacement of the seafloo...