stress-driven

Geohazard information for the masses

Category: Environmental controls on bedrock fracturing

Find me at EGU 2017

As usual, there’s plenty happening at EGU this year. You can find me at any one of these locations: Monday Mon, 24 Apr, 15:30–15:45, Room N1, GM1.6/BG9.38/HS11.11/NH8.8/TS4.7 | | Highlight Dynamic fracture development in response to extreme summer temperatures: 27/7/2014, Långören Island, Finland (EGU2017-16387) by Kerry Leith, Matthew Perras, Topias Siren, Tuomas Rantanen, Suvi Heinonen, […]

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Reconnaissance of ongoing fracturing in the Bedretto tunnel

An important aspect of our envoronmentally-driven fracturing project is a study of ongoing fracturing under relatively stable conditions in the 50 year old Bedretto tunnel. Yesterday Matthew Perras, Prof. Kurosch Thuro (Technical University of Munich), and myself made the first reconnaissance of the 5 km long tunnel and collection of baseline data from a recently […]

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A new SFM model for our Finland field site

Before the winter set in and a long twilight fell on the Finnish archipelago a group of us from ETH Zurich and Aalto University ventured out to Langören island to winterize the measuring equipment and gather data for numerical and structural analyses of the fracturing events. Following from a recent paper from Gonçalves et al. […]

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MSc opportunity: Monitoring progressive fracture propagation in response to environmental stress variations

Candidate: Open Supervisors: Kerry Leith, Dr. Matthew Perras, Valentin Gischig Institution: ETH Zurich Activity: Beginning Fall 2017 Exceptionally warm summer temperatures in northern Europe during the summer of 2014 were accompanied by active fracturing and small rockbursts from flat-lying postglacial bedrock surfaces on a small Finnish Island. Employing a new portable acoustic emission detection system, this project will investigate […]

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BSc opportunity: Processing of acoustic emission (AE) data from an exfoliation fracture formed in response to high temperatures in the Finnish Archipelago

Exceptionally warm summer temperatures in northern Europe during the summer of 2014 were accompanied by active fracturing and small rockbursts from flat-lying postglacial bedrock surfaces on a small Finnish Island. Employing a new portable acoustic emission detection system, this project will investigate the correspondence between key environmental variables (air and rock temperature, humidity, wind, and […]

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BSc opportunity: Robust Sensor Infrastructures for Environmental Monitoring

The global increase in atmospheric temperature may be accelerating the physical breakdown of landscape and infrastructure. Rock expands when heated, and combined with other stresses in the landscape associated with topography and regional tectonic history, can potentially trigger the formation of large rockfalls. Recently, large bedrock outcrops in California and Finland hosted dramatic fracturing events […]

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Fracturing of ancient bedrock surfaces during an extremely hot summer

Long periods of exceptionally high temperatures in California and Finland this summer have been associated with the formation of large ‘exfoliation’ or ‘sheeting’ fractures in bedrock surfaces that may have remained largely unchanged since the last ice age.

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