浅源逆冲型强震易引发越洋海啸 海啸来了如何防范？安全科普↓

Core Viewpoint - The tsunami yellow alert has been lifted, but experts warn that vigilance should not be completely relaxed as residual tsunami waves may still impact coastal activities [1][2][3] Group 1: Tsunami Warning and Impact - The China Natural Resources Ministry's Tsunami Warning Center announced the lifting of the tsunami alert on July 30 at 18:19 [2] - Experts indicate that residual tsunami waves could still affect coastal activities, particularly in narrow bays and estuaries where significant fluctuations may occur [3] - The recent 8.7 magnitude earthquake in the Kamchatka region is noted as the strongest earthquake globally since the 9.0 magnitude earthquake in Japan in 2011, with a shallow depth of 10 kilometers, making it prone to triggering a wide-ranging tsunami [7][9] Group 2: Earthquake Characteristics - The Kamchatka Peninsula is part of the Pacific Ring of Fire, where the Pacific plate subducts beneath the North American plate at a rate of 7.7 centimeters per year, accumulating energy that is released through earthquakes [5] - The earthquake's shallow reverse fault type is likely to cause significant seabed deformation, which is a primary trigger for tsunamis [9] Group 3: Tsunami Preparedness - Prior to a tsunami, individuals should avoid beaches and low-lying coastal areas, and if they experience strong ground shaking or observe sudden water retreat, they should immediately move to higher ground [12] - The destructive power of tsunamis is influenced by coastal topography, with steep areas or "U-shaped" bays potentially amplifying wave heights, necessitating continuous vigilance until official alerts are lifted [14] - In deep water, vessels should not approach the shore or shallow areas, as tsunami waves are less destructive in deep water; personnel on boats should evacuate to higher ground [17]