Near Mackay in Custer County, Idaho — The American West (Mountains)
Earthquake! - The Event
Photographed By Barry Swackhamer, June 25, 2017
1. Earthquake! - The Event Marker
Inscription.
Earthquake! - The Event. . There are no records from explorers’ journals or pioneers’ memories of earthquakes occurring in this area. Scientists have not detected activity in recent time. But, old fault scars indicate that earthquakes occurred before. Geologists recognized that these faults are still active and predicted that the earth’s crust could break here again. And it did! - in the identical location of the last “prehistoric quake.” , On Friday, October 28, 1983, the crust ruptured! The shock -- registering 7.3 on the Richter Scale - spread 500 miles from the focal point, or “epicenter.” You are looking at the scar, or “scarp,” created by the quake.br Thousand Springs Valley dropped about 7 1/2 feet while the Lost River Range rose about a foot - both in a tilted manner.
There are no records from explorers’ journals or pioneers’ memories of earthquakes occurring in this area. Scientists have not detected activity in recent time. But, old fault scars indicate that earthquakes occurred before. Geologists recognized that these faults are still active and predicted that the earth’s crust could break here again. And it did! - in the identical location of the last “prehistoric quake.”
On Friday, October 28, 1983, the crust ruptured! The shock -- registering 7.3 on the Richter Scale - spread 500 miles from the focal point, or “epicenter.” You are looking at the scar, or “scarp,” created by the quake.br
Thousand Springs Valley dropped about 7 1/2 feet while the Lost River Range rose about a foot - both in a tilted manner.
Erected by Challis National Forest.
Topics. This historical marker is listed in these topic lists: Disasters • Natural Features. A significant historical date for this entry is October 28, 1983.
Location. 44° 9.849′ N, 113° 52.093′ W. Marker is near Mackay, Idaho, in Custer County. Marker can be reached from Doublespring Pass Road (Forest Road 116) near Forest Road 679, on the left when traveling east. Touch for map. Marker is in this post office area: Mackay ID 83251, United States of America. Touch for directions.
Other nearby markers. At least 5 other markers are
More about this marker. This marker is located at a geologic exhibit about 2 1/2 miles on a gravel road from US Highway 93.
Photographed By Barry Swackhamer, June 25, 2017
2. Earthquake! - The Event Marker
Credits. This page was last revised on November 7, 2017. It was originally submitted on November 7, 2017, by Barry Swackhamer of Brentwood, California. This page has been viewed 233 times since then and 16 times this year. Photos:1, 2. submitted on November 7, 2017, by Barry Swackhamer of Brentwood, California.
