Re: What is your opinion, why is the increase happening?
You may be a good geologist, but your hypothesis on the forces involved in pressure differences leave something to be desired.
Suppose the seismic activity happens in a specific area of one square mile.
One square mile contains 4.015*10^9 square inches, there is about 14.7 pounds of air pressure per square inch on that surface area.
The total area then is under the pressure of 14.7 * 4.015*10^9 which equals 59,020,500,000 lb.
Suppose that there is a gas bubble underground with similar counter pressure, now suppose that the surface pressure is reduced by 1/2, then the total pressure difference is 29,510,250,000 lb.
How strong or thick must rock be on top of the gas bubble to hold it so that nothing moves between the pressure differences?