The earthquake struck Madison Canyon, an area to the west of Yellowstone National Park. Several aftershocks ranging from 5.8 to 6.3 were reported after the quake. Water pushed by the seiches poured over Hebgen Dam which did not collapse. During the quake, the surrounding landscape dropped as much as 20 feet (6.1 m) and shockwaves caused numerous seiches to surge across Hebgen Lake for 12 hours. Weather Bureau reported that the quake lasted 30–40 seconds. ( August 2020) ( Learn how and when to remove this template message) You can help to improve it by introducing citations that are more precise, and providing page numbers for existing citations.
This article cites its sources but does not provide page references. It also caused the worst landslides in the northwestern United States since 1927. The 1959 quake was the strongest and deadliest earthquake to hit Montana, the second being the 1935–36 Helena earthquakes that left four people dead. Significant effects of the earthquake were also felt in nearby Idaho and Wyoming, and lesser effects as far away as Puerto Rico and Hawaii. The slide blocked the flow of the Madison River, resulting in the creation of Quake Lake. The earthquake measured 7.2 on the moment magnitude scale, caused a huge landslide, resulted in over 28 fatalities and left $11 million (equivalent to $110 million in 2022) in damage. The 1959 Hebgen Lake earthquake (also known as the 1959 Yellowstone earthquake) occurred in the western United States on August 17 at 11:37 pm ( MST) in southwestern Montana.
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