What are jokulhaups? Steve Bachmann and Peter Van Susteren will answer that question and include descriptions of debris flows and mudflows during their presentation scheduled for Thursday, July 13 at 7 p.m. at Mt. Shasta Sisson Museum, 1 N. Old Stage Road in Mount Shasta.

This talk will provide a brief overview of Mount Shasta’s recent debris flow history, locations of mudflows in the past 100 years, and the characteristics of debris flows. Highlights will be the 1929-1932 Mud Creek debris flow, 1997 Whitney Creek debris flow, and the 2014 Mud Creek debris flow.

When asked why debris flows and mudflows are important, Bachmann and Van Susteren answered, “Debris flows are the dominant disturbance process on Mount Shasta. Unlike volcanic eruptions, debris flows occur relatively frequently. One can expect to experience several debris flows on Mount Shasta within a lifetime.

“Also, mudflows have played a major role in shaping the Mount Shasta landscape. Mount Shasta has several communities at its base that are located within mudflow zones. Mudflows move tremendous amounts of material and can have far reaching impacts.

Bachmann and Van Susteren said they are both very interested in the geology of Mount Shasta, “partly because it’s hard not to be, but also because of our work experience on the Mount Shasta and McCloud Ranger Districts.”

Van Susteren worked as a soil scientist on the McCloud Ranger District for 30 years; and Bachmann has worked 23 years as a hydrologist with the Shasta-Trinity National Forest.

This event is part of a series of talks and tours explaining the geology of this area. The suggested $5 donation is a fundraiser for Mt. Shasta Sisson Museum.

Mt. Shasta Sisson Museum is a tax-exempt non-profit organization with an all-volunteer staff that installs new exhibits to share the stories of the Mount Shasta area for its community members and visitors.

The museum is open seven days a week from 10 a.m. to 4 p.m. More information about upcoming presentations and events at the museum can be found at www.mtshastamuseum.com and going to the drop-down menu for Events, clicking on “2017 Presentations and Tours.”

You can also email: museum@mtshastamuseum.com, or call 530-926-5508.