![]() The tremor killed 28 and caused a huge landslide that blocked the Madison River and created Quake Lake, which is five miles long and a third of a mile wide. The earthquake was the deadliest and strongest on record to strike Montana. MontanaĪ magnitude 7.2 earthquake, named the Hebgen Lake earthquake, struck southwestern Montana on August 17, 1959. Should a large earthquake hit a small, rural community, the area could potentially become isolated with the destruction of roads, bridges, cell and radio towers, and electrical power transmission lines. Geological Survey estimates a 63 percent chance of a magnitude 6.0 or larger earthquake to hit the area within 50 years. The nearby Eastern Bear Lake Fault could rupture in the future with a magnitude 7.3 earthquake, although the U.S. The largest of the tremors was a moderate 5.3, but it was enough to make the few in the area wary of a bigger one. The area near the city of Soda Springs, in southeastern Idaho, experienced an earthquake swarm in September 2017. In August 1959, the southeastern corner of the state experienced the magnitude 7.2 Hebgen Lake, Montana, earthquake. While 200 homes received minor to moderate damage, 39 houses and 11 commercial buildings had major damage. Two children died as a result of falling masonry while they were walking to school. Like any major tremor, aftershocks rattled the area for months afterwards, including a 5.4 quake. It was the largest quake to strike Idaho in recent history. On the morning of October 28, 1983, a magnitude 6.9 earthquake shook Central Idaho at Borah Peak. ![]() It was a magnitude 6.5 event and was considered an aftershock of the magnitude 7.2 Hebgen Lake earthquake that struck southwestern Montana the night before.ĭespite the headline grabbing attention of the threat of the Yellowstone supervolcano, or another volcanic eruption in the area, the reality is, a large earthquake poses a higher risk to the area. The largest recorded earthquake in Wyoming occurred on August 18, 1959, in Yellowstone National Park. Recent studies have led researchers to conclude that many of these fault systems are past due for big quakes. Comparably, recent small quakes in Yellowstone (also called an earthquake swarm) registered at 0.6 to 3.6 on the Richter scale. The quake caused massive damage, including 28 fatalities and a considerable 11 million in repairs to highways and timbers. Several faults in western Wyoming are capable of magnitude 7.2 to 7.5 ruptures, including the Teton Fault, Star Valley Fault, Greys River Fault, Rock Creek Fault, and Bear River Fault. An earthquake and resulting landslide killed 28 people and formed Quake Lake. Historical records indicate that earthquakes as strong a magnitude 6.5 are possible in most parts of the state. However, the most seismically active area is the northwest region, where Yellowstone National Park is located. ![]() 2,700) 53 miles away.Earthquakes have occurred in every county of Wyoming. 1000) located 42 miles from the epicenter, Challis (pop. Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Garden City (pop. Weak shaking might have been felt in Stanley (pop. The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report.Ī second report was later issued by the European-Mediterranean Seismological Centre (EMSC), which listed it as a magnitude 4.0 earthquake as well.īased on the preliminary seismic data, the quake should not have caused any significant damage, but was probably felt by many people as light vibration in the area of the epicenter. The quake hit at a shallow depth of 7.7 miles beneath the epicenter near Stanley, Custer County, Idaho, USA, in the afternoon on Saturday, October 2nd, 2021, at 5:47 pm local time. An earthquake of magnitude 4.0 occurred only 18 minutes ago 6 miles northwest of Stanley, Idaho, United States, the United States Geological Survey reported. ![]()
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