Earthquakes excite the Earth’s subsurface over a small area, and waves of energy then propagate through the solid earth. Depending on the depth of the waves and the materials they encounter, they can ...
A pair of geologists with the U.S. Geological Survey, Denver, has created a model that shows Earth's subsurface may hold up to 5.6 × 10 6 million metric tons of natural hydrogen. In their study ...