When the sixth-strongest earthquake ever recorded hit Russia’s Kamchatka Peninsula last week, it triggered tsunami warnings around the world as waves rippled across the Pacific as far as the U.S., Latin America, and even New Zealand. It also may have contributed to the eruption of a long-dormant volcano.Early Sunday on the same sparsely populated peninsula, the Krasheninnikov volcano spewed white ash clouds into the sky for the first time in hundreds of years. The Kamchatka Volcanic Eruption Response Team (KVERT) called it a “historic” eruption.[time-brightcove not-tgx=”true”]Кадры первого в истории наблюдения извержения вулкана Крашенинникова на Камчатке:https://t.co/9AL7FpcX2nВидео: Камчатский филиал ФИЦ ЕГС РАН pic.twitter.com/6TJPVGRTYE— ТАСС (@tass_agency) August 3, 2025There is some discrepancy about when exactly the volcano’s last known eruption took place. According to KVERT, Krasheninnikov’s “last lava effusion” occurred between 1423 and 1503. According to the Smithsonian Institution’s Global Volcanism Program, it was around 1550.About 9.5 hours after the eruption began, KVERT issued an aviation red alert, warning aircraft of “significant emission of ash into the atmosphere.” Satellite data indicated “explosions sent ash up to 8-8.5 km a.s.l.” (appx. 5 mi).The volcano’s activity decreased later Sunday, according to KVERT, which downgraded the aviation alert to orange, but as of Monday evening local time, the eruption remained ongoing, and KVERT warned that “ash explosions up to 10 km (32,800 ft) a.s.l. could occur at any time.”No danger“The plume is spreading eastward from the volcano toward the Pacific Ocean. There are no populated areas along its path. No ash falls were recorded in populated areas. There are no registered tourist groups in the area of the volcano,” the Main Directorate of the Ministry of Emergency Situations of Russia for the Kamchatka Territory posted on Telegram. KVERT said the ash plume had drifted more than 500 km (over 300 mi) by Monday evening.Krasheninnikov is located in the Kronotsky Nature Reserve, which said in a statement that there is no threat to any people or infrastructure as the volcano is largely surrounded by wastelands.“Of course, a volcanic eruption is a vivid and interesting event, primarily for scientists,” Vsevolod Yakovlev, the director of the reserve, said in the statement. But, he added, Krasheninnikov’s “eruption is not something out of the ordinary for a region with high volcanic activity.”Indeed, the Kamchatka Peninsula was recognized in 1996 as a UNESCO World Heritage Site for its “high density of active volcanoes.”The peninsula’s Klyuchevskoy volcano, which is the largest active volcano in the northern hemisphere, erupted just hours after the 8.8 magnitude earthquake on July 30. A U.S. Geological Survey (USGS) representative told LiveScience that the quake “did not cause” the eruption as the volcano was already “showing signs of unrest” in the days and weeks before, though it likely intensified the “vigor of the eruption including some ash emission.”How are earthquakes and volcanoes related?Earthquakes and volcanic activity both stem from the movement of the earth’s tectonic plates. Volcanic and seismic activity are common at the boundaries of such plates.The Institute of Volcanology and Seismology of the Far Eastern Branch of the Russian Academy of Sciences said that there is a “direct connection” between last week’s historic earthquake and the activation of volcanoes that occurred after. The earthquake, the institute’s director Alexey Ozerov said, “activated magmatic centers, ‘pumped’ additional energy into them.”Krashennikov’s eruption may not have been entirely triggered by the earlier, nearby 8.8 earthquake, Harold Tobin, a professor of seismology and geohazards at the University of Washington, told NPR. But, Tobin noted, the quake’s seismic waves may have acted to “shake loose the system that then allows it to actually erupt.”According to the USGS, earthquakes can sometimes trigger volcanic eruptions: “A few large regional earthquakes (greater than magnitude 6) are considered to be related to a subsequent eruption or to some type of unrest at a nearby volcano.”According to the USGS, “volcanoes can only be triggered into eruption by nearby tectonic earthquakes if they are already poised to erupt.” If there is already enough eruptible magma within the volcanic system and significant pressure within the magma storage region, large tectonic earthquakes might cause dissolved gases to come out of the magma, increasing the pressure and causing an eruption, the agency says, likening the effect to “a shaken soda bottle.”