Newsgroup: it.scienza.geologia
Titolo: Nuovi studi sugli effetti del fracking

Segnalo questo studio apparso pochi giorni fa, riguardo a una possibile
correlazione tra fracking e scatenamento di terremoti:
 
 
http://phys.org/news/2012-08-wells-small-earthquakes.html
 
 
   Study finds correlation between injection wells, small earthquakes
    (August 6, 2012)
 
  "You can't prove that any one earthquake was caused by an injection
  well," says Frohlich. "But it's obvious that wells are enhancing
  the probability that earthquakes will occur." Frohlich analyzed
  seismic data collected between November 2009 and September 2011 by
  the EarthScope USArray Program, a National Science Foundation-funded
  network of broadband seismometers from the Canadian border to the
  Gulf of Mexico. Because of the high density of instruments (25 in
  or near the Barnett Shale), Frohlich was able to detect earthquakes
  down to magnitude 1.5, far too weak for people to feel at the surface.
 
  He found that the most reliably located earthquakes - those which are
  accurate to within about 0.9 miles (1.5 kilometers) - occurred in eight
  groups, all within 2 miles (3.2 kilometers) of one or more injection
  wells. Before this study, the National Earthquake Information Center
  had only identified two earthquake groups in the area strongly
  associated with specific injection wells. This suggests injection-
  triggered earthquakes are far more common than is generally recognized.
 
  (...) This study comes as some policy makers and members of the public
  are expressing concern about possible environmental and health impacts
  of hydraulic fracturing. Most earthquakes identified in the study
  ranged in magnitude from 1.5 to 2.5, meaning they posed no danger
  to the public. (...)
 
  "It might be that an injection can only trigger an earthquake
  if injected fluids reach and relieve friction on a nearby fault
  that is already ready to slip," says Frohlich. "That just isn't
  the situation in many places."
 
Ma avrebbe invece potuto essere la situazione in Emilia, o sbaglio?
 
By the way, segnalo anche questo studio sulla potenziale correlazione
tra fracking e contaminazione delle falde acquifere:
 
 
http://is.gd/J6lrBA
  =  
http://phys.org/news/
 
  2012-08-substantial-pollution-hydraulic-fracturing.html
 
   Substantial water pollution risks from hydraulic fracturing: research
    (August 6, 2012)
 
  The researchers found that disposal of the large amounts of fracking
  well wastewater presents risks from salts and radioactive materials
  that are "several orders of magnitude larger" than for other potential
  water pollution pathways examined in the new study. Other water
  pollution pathways studied include a tanker truck spilling its
  contents while transporting fluids used in the drilling process going
  to or from a well site; a well casing failing and leaking fluids to
  groundwater; fracturing fluids traveling through underground fractures
  into drinking water; and drilling site spills at the surface caused by
  improper handling of fluids or leaks from storage tanks and retention
  ponds.
 
  The disposal of used hydraulic fracturing fluids through industrial
  wastewater treatment facilities can lead to elevated pollution levels
  in rivers and streams because many treatment facilities "are not
  designed to handle hydraulic fracturing wastewater containing high
  concentrations of salts or radioactivity two or three orders of
  magnitude in excess of federal drinking water standards," according to
  the researchers. The wastewater disposal risks dwarf the other water
  risks, although the authors say "a rare, but serious retention pond
  failure could generate a very large contaminated water discharge to
  local waters."
 
Bye,
 
  *GB*

 Ma avrebbe invece potuto essere la situazione in Emilia, o sbaglio?
 
Avrebbe potuto *se* avessero fatto fracking lì.
 
Cioè avrebbero potuto anticipare il terremoto di un po', non scatenare un 
terremoto che non ci sarebbe mai stato.
 
-- 
  Daniele "Vihai" Orlandi
  Bieco Illuminista #184213

Anche io supporto la teoria che il terremoto emiliano sia di origine tettonica-naturale.
 
In rete di Buffonate se ne leggono anche troppe...
 

 terremoto che non ci sarebbe mai stato.
 
approfitto anche del crosspost per chiedere:
sarebbe possibile impedire o ridurre terremoti distruttivi impiegando 
con frequenza altri mezzi (fracking, esplosioni, ecc.) che causando 
terremoti di intensità inferiore impediscano l'accumulo di energia?
 
-- 
bye
!(!1|1)
 

 terremoti di intensità inferiore impediscano l'accumulo di energia?
 
Da quello che ho capito (da perfetto ignorante della materia) penso ci siano 
due problemi:
 
Causare alcuni terremoti deboli in luoghi vicini può concentrare le tensioni 
in un altro luogo causando lì un terremoto più intenso.
 
Se ci sono già accumulate tensioni da terremoti con ricorrenza 500 anni e tu 
riesci a innescare un terremoto 50 anni prima di quando si sarebbe innescato 
"naturalmente", hai comunque il 90% di energia... (e magari in quei 50 anni 
avresti potuto adeguare un po' di costruzioni che invece cascano subito).
 
Ciao,


 avresti potuto adeguare un po' di costruzioni che invece cascano subito).
 
però con un terremoto controllato (ammesso sempre che una cosa del 
genere sia possibile) la popolazione potrebbe essere messa in 
sicurezza prima, a differenza dei terremoti "naturali"
 
comunque vedo che cercando con google "controlled earthquake" qualcosa 
esce fuori...
 
Barry Raleigh and colleagues at USGS
Recognized that if earthquakes could be turned on, they could also be 
turned off
They theorized that it might be possible to release stress that was 
building up before a major earthquake occurred by causing a whole lot 
of non-destructive, minor earthquakes
Needed a place to test this idea
 
insomma qualcuno ci ha già pensato e se la cosa non viene utilizzata 
sarà perché è ancora in fase sperimentale o perché ci sono comunque 
dei problemi...
-- 
bye
!(!1|1)
 
 

   the probability that earthquakes will occur." Frohlich analyzed
 
Il fracking fa paura per ben altro... Guardarsi il film-documentario 
"gasland" per capire la bestialit� del suddetto sistema di estrazione
del gas...
 
-- 
 

 del gas...
 
infatti il post originale citava anche:
 
   The researchers found that disposal of the large amounts of
   fracking well wastewater presents risks from salts and
   radioactive materials that are "several orders of magnitude
   larger" than for other  potential water pollution pathways
   examined in the new study... ecc...
 
o parlavi di altri problemi?
 
-- 
bye
!(!1|1)