South Sister Bulge - Deschutes County, Oregon
Posted by: 
Volcanoguy
N 44° 02.149 W 121° 45.719
10T E 599197 N 4876595
This history sign is at the Devils Lake viewpoint along the Cascade Lakes Highway west of Bend, Oregon.
Waymark Code: WMJ9PZ
Location: Oregon, United States
Date Posted: 10/15/2013
Views: 3
This geologic history sign is located at Devils Lake.
Marker Name: South Sister Bulge
Marker Text: In 2001, the Bulge was discovered from outer space by a satellite orbiting the earth 2,000 miles away.
A new imaging technology known as Satellite Radar Interferometry (InSAR) was used to measure a very small uplift around South Sister Volcano. This has allowed the US Geological Survey to continuously monitor the Bulge for future changes. Its expansion was caused by rising magma.
Rising magma came from 3 miles beneath the surface of the earth. The Bulge has only expanded 6 to 9 inches at the center of a 100 square mile area. Prior to an eruption, warning signs observed would be an increase in seismic vibrations and gases such as chlorine, helium, and sulfur.
Historic Topic: Geological
Group Responsible for placement: Forest Service
Marker Type: Roadside
Region: Central Oregon
County: Deschutes
State of Oregon Historical Marker "Beaver Board": Not listed
Web link to additional information: Not listed
|
Visit Instructions:
Include your thoughts and observations pertaining to this location and your visit. Provide any additional history that you are aware of that pertains to this location. If the marker commemorates a historic building tell us what it is used for now or share with us the circumstances of an earlier visit to bring this locations history to life.
Please upload a favorite photograph you took of the waymark. Although visiting this waymark in person is the only thing required of you to receive credit for your visit, taking the time to add this information is greatly appreciated.
Be creative.