Seismologist Deborah Kilb noticed something strange when examining the last 40 years of California earthquake records. Kilb, Sierra Nevada’nın under the depths of the world’s crust that occurred a series of deep earthquakes.
Kilb, “Northern California earthquake data usually decreases up to 10 kilometers below the ground. Southern California is slightly deeper and reaches 18 kilometers. The earthquakes in the region usually occur in these distances. However, the depth of the earthquakes that occur in the central region of the mountain row,” he said.
Stating that this is strange, the seismologist said, “This is not a typical thing in the crust earthquakes,” he said.
Researchers who use new data took images of Sierra Nevada’s depths in a function analysis method that maps the internal structure of the Earth using seismic waves. Scientists found that the data they obtained found that the Earth’s shell began to peel in the central region of the mountain order and that scientifically known as lithospheric collapse. These findings were sent to Geophysical Research Letters in December.
The hypothesis overlaps with previous speaklyions that the region’s outermost layer of the Earth sinks into the lower layer of the mantle layer.
Studies on the subject continue.
He is a research scientist at the Environmental Sciences Research Cooperative Institute. Vera Schultte-Pelkum, “We compared the notes and we noticed that the signals about the sequence of the rocks I found are in the same area as the earthquakes. Then we looked more closely and reached this hypothesis,” he said.
Lithospheric collapse, more intense materials towards the bottom and less dense materials and consequently the process of the formation of the land.
Researchers found a significant layer in a depth of approximately 40 to 70 kilometers in mantle. The traces of this layer gradually move to the north.
Scientists assume that the lithospheric collapse process in Southern Sierra in the world ended about 4 million years ago. Schultte-Pelkum said that this kind of collapse took place occasionally around the world.
