Less than two months after a magnitude 8.8 earthquake rocked Russia’s Kamchatka Peninsula, another strong earthquake occurred early on September 19, local time.
Although tsunami waves have been observed closer to the earthquake’s epicenter off Kamchatka’s east coast, shortly before 5 P.M. EDT, officials at the U.S. Tsunami Warning Center announced an “all clear” for Hawaii, ruling out the possibility of giant waves crossing the Pacific Ocean.
The United States Geological Survey (USGS) made an initial estimate of the earthquake’s magnitude as 7.8, meaning that the July 29 event released more than 30 times the energy as this event and produced waves with about 10 times the magnitude. (The scale by which scientists measure earthquakes is logarithmic, not linear.)
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The July event was among the 10 strongest earthquakes on record; this new temblor won’t make that cut. According to Reuters, the Kamchatka region’s governor said that there have been no reports of damage from the event in the sparsely populated region.
USGS has already confirmed that the 7.8-magnitude event is an aftershock of the earlier earthquake, making it the quake’s largest aftershock to date. Both earthquakes occurred on the Kuril-Kamchatka plate boundary, which stretches from northern Japan along the eastern coast of the Kamchatka Peninsula toward the Aleutian Islands. Here, the Pacific plate is sinking under the North American plate, making the region one of the world’s most seismically active, according to USGS.
The July earthquake spurred concerns of a serious tsunami but ended up not producing such a phenomenon due to local geology.