Wall Art and Photo Gifts from Science Photo Library
Gravity map of Hudson Bay
Gravity anomalies. Free-air gravity anomaly map, showing the low-gravity anomaly in Hudson Bay, Canada, which is partly due to the last ice age. These anomalies are the differences between the theoretical value of gravity at the surface and the measured value. The colours range from purple (low gravity), through blue, green (normal) and yellow to red (high). The Hudson Bay anomaly makes a small but significant 0.005% difference. It occurs partly because the areas rocks are still recovering from being compressed by the Laurentide ice sheet 10, 000 years ago. The high density of molten rock under the area also contributes
Science Photo Library features Science and Medical images including photos and illustrations
Media ID 6350987
© MARK SIMONS/CALIFORNIA INSTITUTE OF TECHNOLOGY, 1997/SCIENCE PHOTO LIBRARY
This print showcases a gravity map of Hudson Bay, Canada, revealing intriguing gravity anomalies. The free-air gravity anomaly map exhibits a striking low-gravity anomaly in the region, which can be attributed to the remnants of the last ice age. These anomalies represent variations between the measured and theoretical values of gravity at the surface. The color spectrum employed in this image ranges from purple (indicating low gravity) to blue, green (representing normal levels), and finally yellow and red (highlighting high gravity). Notably, the Hudson Bay anomaly contributes to a small yet significant 0. 005% difference overall. The origins of this unique phenomenon lie partly in the aftermath of intense compression caused by the Laurentide ice sheet around 10, 000 years ago. As time passes, rocks within these areas are gradually recovering from their compressed state. Additionally, an increased density of molten rock beneath Hudson Bay also plays a role in shaping these gravitational irregularities. This awe-inspiring photograph captured from space offers us an extraordinary glimpse into Earth's geological history while highlighting how natural forces continue to shape our planet today. It serves as a testament to humanity's ongoing exploration and understanding of our world through scientific endeavors such as earth sciences.
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