Beyond navigation: how GPS helps scientists monitor the pulse of our planet
In short: Your smartphone uses GPS to pinpoint your location within a few meters, but for scientists, that precision is just the beginning. By using specialized receivers, researchers are transforming satellite signals into powerful tools to monitor tectonic shifts, ice sheet behavior, and even volcanic activity.
While a standard smartphone receiver determines location within approximately 1 to 10 meters by measuring signal arrival times from four or more satellites, scientific-grade equipment offers much higher resolution. These advanced receivers can pinpoint locations down to centimeters or even millimeters. This fine-grained data allows researchers to observe geological processes that occur on much slower scales than sudden seismic events. This high-precision capability is essential for capturing subtle changes in the Earth's crust. By measuring these minute shifts, scientists gain a deeper understanding of our world's complex dynamics. By analysing these signals in novel ways, researchers are uncovering much more information than previously anticipated. This evolution in technology has been driven by the development of increasingly rapid and precise devices over the last ten years.
For example, while seismometers measure the immediate shaking of the ground during a rupture, GPS can track the slow, steady movement of tectonic plates. This capability allows geoscientists to monitor the rate at which crustal plates, such as those along the San Andreas Fault, grind past one another. This insight into long-term movement helps scientists better understand the mechanics of the Earth's crust.
The versatility of the technology has led to what researchers call 'MacGyvered' applications. Beyond mapping, GPS instruments are being repurposed to act as unexpected tools, such as snow sensors, tide gauges, and monitors for ice sheet behavior. In Antarctica, for instance, the Polar Earth Observing Network (POLENET) utilizes GPS and seismic measurements to study ice sheet movement. These advancements have contributed to improved warning systems for natural disasters, including volcanic eruptions and flash floods.
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Sources
- Summary by Intellect · source: Unexpected Ways Scientists Use GPS
- Also: Five Things You Probably Didn't Know GPS Could Do
- Also: GPS Is Doing More Than You Thought
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