Mount Rainier earthquakes set new record

Mount Rainier is rattling with the most powerful earthquake swarm scientists have ever recorded at the volcano.Why it matters: Rainier's reputation as the Cascades' most dangerous volcano means even minor tremors can fuel both scientific investigation and public anxiety — though experts say there's no immediate cause for concern.By the numbers: As of Friday, researchers had analyzed 780 of about 1,200 tremors recorded at the 20 seismic stations on or near the volcano since July 8, according to the Pacific Northwest Seismic Network (PNSN).Quake activity was ongoing Monday morning, with seven recorded by 8am.The largest among them was a magnitude 2.2 earthquake 1 mile underground.What they're saying: This is the "most energetic swarm" ever recorded at Mount Rainier, PNSN director Harold Tobin tells Axios, but right now there's no sign of unusual magma activity.What's happening: Although analysts haven't reviewed every event, all of the larger ones have been checked, says Tobin, and so far, everything about this swarm is consistent with typical hydrothermal activity — hot water and heat circulating through the volcano's plumbing and triggering small fault slips.What we're watching: Scientists are on the lookout for a number of signs that could show developing unrest, says Tobin, including stronger earthquakes, bulging ground and plumes of steam and gas.

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