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Penn State Scientists Use Thunderquakes and Fiber Optics for Seismic Imaging
Key points
- Thunderquakes generate complex seismic signals.
- Penn State team created a model to interpret these signals.
- Fiber-optic cabling was used for data collection.
- Method mapped terrain under the local campus.
New Seismic Imaging Method
A team of scientists at Penn State has introduced a new approach to seismic imaging, utilizing "thunderquakes" and fiber-optic cabling. This method provides an alternative to traditional seismic data collection, which typically relies on natural earthquakes or controlled explosive events.
Interpreting Thunderquake Signals
Thunder generates seismic waves that enter the Earth's upper crust, creating what are termed "thunderquakes." However, the seismic signals produced are highly complex due to the nature of thunder generation. Lightning creates superheated plasma bubbles, forming a string of acoustic shock waves that interfere with each other and expand rapidly upon hitting the Earth.
Model Development and Application
The Penn State team developed a model to manage the complexity of these thunderquake signals. This model allows for the extraction of clear data from the otherwise intricate seismic readings. They successfully applied this new methodology to reconstruct the subsurface terrain beneath their local campus.
Implications for Geophysics
This development offers a novel tool for geophysicists to study the Earth's interior. By leveraging naturally occurring thunder, researchers can potentially conduct seismic imaging in specific areas without the need for artificial seismic sources, bridging the gap between passive earthquake monitoring and active seismic surveys.
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Reporting from
Scientists at Penn State developed a model to interpret seismic signals from "thunderquakes" and used fiber-optic cabling to map subsurface terrain. This method offers a new way to conduct seismic imaging without waiting for earthquakes or using explosives.