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You are here: Home / Portfolio / Subsidence Study Using Geophysics

Subsidence Study Using Geophysics

portfolio typeCase Historiespdf iconDownload this as PDFPosted on June 23, 2012

GPR Survey

Challenge

Mundell was contracted to examine an area experiencing subsidence in the backyard of a local residence, which was present near a quarry.

Action

Mundell completed a preliminary ground-penetrating radar (GPR) survey of the area to determine the extent of subsidence (see figure). After the subsidence area had been mapped, several two-dimensional resistivity imaging (2DRI) profiles were completed to image the underlying soil and bedrock strata.

Results

The GPR survey indicated that an area approximately 65 by 15 feet is experiencing subsidence. The resistivity data collected across this feature clearly indicates that a pit-like feature was developing. Despite this, there did not appear to be a shallow soil settlement or soil loss mechanism to explain the subsidence, and based on that, it was thus concluded that the subsidence is most likely caused by deep, vertical soil movement which may be the result of settlement of the unconsolidated soils or soil loss into the underlying bedrock.

2D Resistivity Profile

2D resistivity profile showing the subsidence of deeper geologic layers due to possible quarry activities.

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Our Affiliations

- Midwestern States Environmental Consultants Association
- Environmental & Engineering Geophysical Society
- Professional Geologists of Indiana, Inc.
- National Ground Water Association
- American Societies of Chemical / Civil Engineers Engineers without Borders
- Association of Environmental and Engineering Geologists
- Indiana Association for Environmental Professionals
- Geological Society of American
- Indiana Circular Economy Initiative
- Economy of Communion
- Indiana Recycling Coalition

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To ensure that as much warm air as possible is delivered through your central system, check the ductwork and wrap any leaks with duct mastic. Distribution losses (what’s lost while air is transported from your furnace through ductwork to the vents) often amounts to 30%. So, sealing ductwork could increase efficiency and the warm air you receive considerably … keeping you warmer and making your furnace work less.

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