Quakes and Tremors

[Irrev-Black]

f121e1a0ba404b5cc5dc5b50e2e21305836ff9ca.jpg (61.38 KiB) Viewed 1118 times

5.6 magnitude quake near Perth overnight.


https://www.brisbanetimes.com.au/nation ... 5du9o.html

[nutmeg]

I presume it was this that woke me yesterday morning. It started as a distinct "thump", apparently on the roof, but probably that was just how my dreaming brain interpreted it. This was followed by definite shaking of the house. The birds outside were obviously disturbed as well. I'm well over 300 km from Gnowangerup. No damage.

[Irrev-Black]

Don't like quakes? Tell the petrochem guys to frack off!

New research confirms fracking causes slow, small earthquakes or tremors, whose origin was previously a mystery to scientists. The tremors are produced by the same processes that could create large, damaging earthquakes.

Fracking is the high-pressure injection of fluids underground to extract oil and natural gas. Though it is typically done with wastewater, this study examined data from fracking with liquid carbon dioxide. The process pushes carbon underground and keeps it from trapping heat in Earth's atmosphere.

By some estimates, carbon dioxide fracking could save as much carbon annually as one billion solar panels. It is much more advantageous for the environment to frack with liquid CO2 than with wastewater, which does not keep carbon out of the atmosphere.

"Because this study examines a process that sequesters carbon underground, there may be positive implications for sustainability, and for climate science," said Abhijit Ghosh, associate professor of geophysics at UC Riverside and co-author of the study in the journal Science.

Because the carbon dioxide is liquid, however, Ghosh said the results of this study almost certainly apply to fracking with water. Both are likely to cause tremors.

On a seismograph, regular earthquakes and tremors appear differently. Big quakes cause sharp jolts with high amplitude pulses. Tremors are more gentle, rising up slowly above the background noise with much less amplitude, and then slowly decreasing.

"We are pleased that we are now able to use these tremors to track the movement of fluids from fracking and monitor the movement of faults resulting from the fluid injections," Ghosh said.

https://www.sciencedaily.com/releases/2 ... 110345.htm