New Info on the Origin of Bimodal Volcanism on Oregon’s High Lava Plains

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New Info on the Origin of Bimodal Volcanism on Oregon’s High Lava Plains

April’s Friday night lecture was given by a truly distinguished Oregon geologist and highlighted recent research into an area that has long intrigued geoscientists about Oregon. Dr. Anita Grunder has led a team of researchers, including PSU’s Martin Streck, exploring the possible origin of the magma that has peppered Oregon’s High Lava Plains geologic province in the last 12 million years. This magma includes both rhyolite and basalt eruptions in a swath of territory between Steen’s Mountain region to the southeast and Newberry Volcano to the northwest. 

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Speaker Mike Collins Provides Dramatic Visualizations of Hotspot Evolution

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Speaker Mike Collins Provides Dramatic Visualizations of Hotspot Evolution

Mike Collins, a retired administrator in manufacturing, and an avid mountaineering and geology enthusiast, presented his slide show “Flood Basalts, Hot Spots, and Spreading Centers and the Creation of the Western Landscape,” to a full house last month at the GSOC Friday night lecture. His show was based upon a manuscript he has produced explaining the evolution of the Western landscape in terms that non-technical people can understand. It is lavishly illustrated with scratchboard drawings that he has drawn, which take the reader back to scenes he describes in the book. 

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Dark Noon

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Dark Noon

Dr. Richard Waitt, who arrived in Washington state from the USGS office in Menlo Park, California, shortly after the eruption of Mt. St. Helens, stayed to study the volcano and built the bulk of his career at the Cascades Volcano Observatory (CVO) in Vancouver, Washington. Dr. Waitt came to promote his new book In the Path of Destruction: Eyewitness Chronicles of Mount St. Helens, Washington State University Press, 2015, to the GSOC audience and to describe the book’s origin and some of the stories it contains. He said that early in his research into the events of the volcanic eruption, he was focused more on the hard geology that people could describe. However, he became involved more in the stories that people told about their experiences and the process of determining the details of the event by analyzing the interviews of the witnesses. 

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LUSI Mud Eruption: Natural or Man-Made Disaster?

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LUSI Mud Eruption: Natural or Man-Made Disaster?

Ever since the mud started spewing from the Lumpur Sidoarjo (aka “Lusi”) mud volcano in the subdistrict of Porong, Sidoarjo on East Java Island, Indonesia, on May 29, 2006, an opportunity to study the feature and, fortunately or unfortunately, become embroiled in the political controversy over it opened in the geological community. Newly appointed Assistant Professor Maxwell Rudolph of Portland State University was involved in studies related to this phenomenon during his doctoral years at UC Berkeley ending in 2012, and spoke to GSOC at the June Friday night lecture describing his work. 

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Do we need this Aggradation?

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Do we need this Aggradation?

Tom Pierson’s talk to GSOC focused on his study of the aggradation and erosion of volcanic sediment that occurred in the Rio Chaiten valley as a result of the December 2008 and February 2009 eruptions of the Chaiten volcano in the southern region of Chile. Pierson, who has worked at the USGS Cascades Volcano Observatory since 1981, has traveled the Pacific rim studying hydrologic and geomorphic responses to volcanic eruptions.

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