All posts by ehgroth

EPSSI Seminar: Shock Tube Recreations of Shock Waves and Jets Generated During Explosive Volcanic Eruptions

The Earth, Planetary, and Space Sciences Institute
proudly presents:
Ezequiel Medici, MTU ME-EM Research Engineer
The EPSSI seminar for Monday, December 1, 4:00 p.m., M&M U113

“Shock Tube Recreations of Shock Waves and Jets Generated During Explosive Volcanic Eruptions”

Abstract: At the beginning of a suddenly explosive volcanic eruptions two types of phenomena can be observed, the formation of a shock wave immediately followed by a supersonic jet of expanding vapor-solid-liquid mixture. The intensity of the shock wave and the structure of the supersonic jet can carry a significant amount of information about the intensity and the dynamics of the volcanic eruption. Despite the hazard they represent to the immediate surrounding area of the volcano vent, these atmospheric shock waves and the subsequent sonic wave can be safely measured at a long distance from the vent. This characteristic makes the measurement of shock/sonic waves suitable for safe, real-time remote sensing of the conditions at the volcanic vent during the eruption. Preliminary results, based on the experiment performed on the shock tube, indicate a strong correlation between the energy released by the eruption, calculated by standard methods post eruption, and the intensity of the shock wave as measured through its pressure field. This correlation could ultimately lead to a more reliable model of shock/sound wave propagation which will serve as an early warning system for the air traffic control.

Immediately after the shock wave, an over pressurized jet mixture of vapor, solid particles, and liquid begins to expand. This mixture typically contains a relatively high concentration of solid particles of different size. To study the coupled interaction between the expanding gas and the particles, a series of analog explosive volcanic experiments using the atmospheric shock tube were performed. High-speed shadowgraph imaging of the expanding jet mixtures is recorded for different initial jet energy, particle sizes and particle concentrations. The study and observations of the interaction between the mixture of expanding gas and particles can elucidate the mechanisms acting during the initial stage of the formation of ash plumes or pyroclastic flows.


Community Lecture/Discussion: What’s Up with Lake Superior?

345On Tuesday, November 18, Professor Sarah Green, expert on Lake Superior, will lead a discussion titled Lake Superior’s history and future. The event is part of a monthly series of sessions on the Geoheritage and Natural History of the Keweenaw, at the Carnegie Museum in Houghton. The discussions are aimed at the general public, but discuss current research and science.

Professor Green explains her discussion: “Lake Superior defines our region. It’s a powerful force that is both constant and changing. I will show how we can see day-to-day conditions on Lake Superior from buoys. I will also talk about how the lake has changed over the past hundred years and what we predict for its future. Bring your questions! What makes the beaches change from one day to the next? Why does the water level change from one year to the next? How does water move around the lake? What changes have you seen during the time you have lived here?”

The Carnegie Museum of the Keweenaw, located at Huron & Montezuma in downtown Houghton. Seminars are held in the recently restored Community Room on the ground level of this historic building. Lectures are free, open to the public, and barrier free (wheelchair accessible). For each monthly lecture, the museum will open at 6:30 pm for refreshments; lectures and discussion occur from 7:00 to 8:00 pm. Please contact the Museum for further information, 906-482-7140.


Stabilizing Geotechnical Assets: New Research Aims to Identify Potential Highway, Railroad Problems

image57399-persWhile we’re able to enjoy timeless scenery as we travel in the United States, it’s important to realize that the soils and rocks forming the base of these transportation systems may not forever be stable.

In a new project led by Michigan Technological University, Thomas Oommen, assistant professor of geological and mining engineering and sciences, heads a team that is using advanced technology to develop a comprehensive management system to monitor our nation’s geotechnical assets—the ground that forms the base for the concrete, asphalt or steel that makes up our transportation system.
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Gari Mayberry Featured in Washington Post

image86273-lthumbMichigan Tech 1999 MS Geology Alum Gari Mayberry was featured in the Washington Post article “Gari Mayberry: Lessening the impact of natural disasters worldwide” She is employed by the U.S. Geological Survey (USGS) while working at the U.S. Agency for International Development (USAID). wHer work involves the Office of Foreign Disaster Assistance (OFDA) where she is leading and coordinating the U.S. government’s response to disasters overseas and mitigation of geological hazards.

Read her Alumni Profile: Gari Mayberry


Fifth Annual Marvin Party at Continental Fire Company

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The Marvin Party Reached Its Goal

by Jennifer Donovan, director of news and media relations

Marvin Rene Huezo Mendoza will be able to pay for his final year of university in San Salvador and graduate in 2015.

Hans Lechner and Emily Gochis, graduate students who organized the annual Marvin Party to raise money to put Marvin through university, have announced that the Marvin Party this year met and exceeded its goal. Anything that remains after Mendoza’s bills are paid will go to help other students sponsored by Project Salvador.   Continue reading


GMES Department celebrates visit of distinguished earth science educator

This wednesday October 1, Prof Emeritus Hank Woodard of Beloit College will visit friends in Houghton, Pete and Carol Ekstrom. Woodard has been a forceful leader of earth sciences education for more than 50 years, at Beloit College. Geosciences are absent or under emphasized in US schools so most professionals in the field do not discover its advantages until they come to college. And even then, many colleges either do not offer the field or they underfund it, perceiving it to have limited interest.   Continue reading



Lake Superior Agates Show at Denver

The A. E. Seaman Mineral Museum recently showed an exhibit, “Lake Superior Agates: Treasures on the Beaches,” at the 2014 Denver Gem and Mineral Show. The three-day show is the second largest event of its kind in the world and draws an international audience of over 10,000. Associate Curator Christopher Stefano participated in the show’s Meet the Curator event, an opportunity for members of the general public to meet and interact with curators from the major mineral museums that exhibit at the show.


Seaman Garden at Mineral Museum to Be Dedicated

John “Jack” Seaman, grandson of the namesake of the A. E. Seaman Mineral Museum at Michigan Tech, and his wife, Phyllis, have given a gift to support the museum’s endowment to further the work of Jack’s grandfather and enhance the museum experience for visitors long into the future. In recognition of their generosity, the Phyllis and John Seaman Garden will be dedicated this Thursday, Sept. 11, at 1 p.m. at the Mineral Museum on Sharon Ave.   Continue reading


Rail Transportation Seminar: Railway Track Structures Research at Tampere University of Technology

sep8Rail Transportation Program and Environmental Engineering Geologists AEG Michigan Tech Student Chapter present Dr. Pauli Kolisoja Professor, Dept. of Civil Engineering Tampere University of Technology (TUT) in Finland presented a seminar on rail research at TUT at Michigan Tech on Monday, Sept. 9, 12-1 p.m. at DOW 875.

The title of the seminar is: “Railway Track Structures Research at Tampere University of Technology”   Continue reading