When a leaning post oak threatened a home, arborist Chris Hastings used sonic tomography—driving metal pins into the trunk and tapping them with a sensor-equipped hammer—to map internal decay. Sound waves travel faster through solid wood; the computer generates a cross-sectional image showing sound vs. rotted areas.
In this case, the trunk was solid, but the severe lean warranted removal. The technology provides a non-invasive "MRI for trees," helping owners make informed decisions about risky trees.
Sensors installed on trunk
Connecting computer to sensors
Tapping pins with special hammer
Interior cross-section of the trunk
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