# Questions tagged [geophysics]

Geophysics is a subject of natural science concerned with the physical processes and physical properties of the Earth and its surrounding space environment.

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### What is the relationship between earthquake risk, magnitude, and distance from the epicenter?

I need a (rough) functional relationship between these three quantities. My initial hypothesis is that the risk $R$ (intended as the probability of a building damage), scales with the square root of ...
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### Does this support Hapgood's Earth Crust Displacement Theory?

I'm no Geologist by any standard but I'm quite intrigued by what goes on below our feet. I came across this article that states there's a new or (confirmed) partially melted layer in the athenosphere (...
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### Simple Mathematical Equation for the Geotherm

Hi I need a simple equation (polynomial third straight) for a PerpleX simulation to represent the mantle geotherm. The geotherms I have found on the internet so far (unfortunately I don't have the ...
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### Where could I get waveform data on low-frequency earthquakes, very low-frequency earthquakes, volcanic tremor and non-volcanic earthquakes?

I am a marine geology masters student and I am writing my thesis on slow earthquakes. I will include graphs of the most common types of earthquakes: Low-frequency earthquakes Very low-frequency ...
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### Is it possible that the rainbow sand dunes in Death Valley, California were formed by some massive mining in the ancient past? [closed]

I know there is a mainstream answer that thinks the rainbow sand dunes they be explained geologically... I just want to know if it's possible to form those colors and those dunes from mining? And if ...
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### Why does calcium occur together with felsic rocks and magnesium with mafic rocks if calcium is denser than magnesium?

Felsic rocks contain a lot of sodium, potassium and calcium (and a great deal of aluminum), while mafic rocks consist of a lot of magnesium with iron.... Why is this? Why is magnesium (z=12) in the ...
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### How does the rotation of Earth's inner core influence climate?

In the recent paper published in Nature that sugests a 60-70 years inner core rotation cycle, it is said: Interestingly, the same multidecadal periodicity is also well observed in the Earth’s climate ...
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### How much fresh water could be produced by pumping warm humid air through a pipeline up to the top of a mountain?

I have been doing a lot of research on the Internet lately about various desalination processes which are being used today and this led me to begin studying about mountain weather and the orographic ...
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### Does the high pressure inside the Earth's core contribute to its high temperature?

The explanations for why the Earth's core is hot I found on the internet included: leftover energy from the Earth's formation radioactivity of the elements inside the core friction between the core ...
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### Relation between highlands and tidal forces

Could the presence of mountain ranges in continental areas near to tectonic plates boundaries prevent these plates from swaying up and down as a result of vertical tidal forces and plastic ...
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### Where can I access public sonic well-log data?

I'm doing some research and I'm in need of some well-log data from a sonic tool. I'm specifically looking for a multi-receiver tool with 6 or more receivers if possible. I've been able to find a lot ...
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### What makes special a volcanic pipe to be stable until the mantle?

Comming from this question: Can we really travel through earth's core? I wonder what makes special a volcanic pipe to be stable since the mantle through the surface, in comparison to our try or ...
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### Distribution of terrestrial impact craters

Recently I was looking at a map of known impact structures and I noticed that they are concentrated between the tropical and arctic latitudes, but there is very little near the equator. I can think ...
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### Why were the Interglacial periods in the early Pleistocene spaced about one million years apart, but recent ones only 100,000 years apart?

The Teglen (or Tiglian) interglacial period began after approximately half a million years into the Pleistocene, and the next interglacial (Waalian) occurred about a million years after that. But the ...
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