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In my personal opinion it is a subduction zone.
Now, personally I have done estimates and I get something like 9.6 magnitude for the 2-7-1812 quake
This is not the energy release estimation (which keep in mind is speculative for quakes back then and not actually measured), but the intensity of the shaking.
Originally posted by PuterMan
Posters of the Arkansas swarm from USGS.
Don't know if these have been posted yet.
Dear Mr. *snip*, Thank you for contacting me with your concerns of energy, oil, and gas, and their costs. I appreciate hearing from you as I begin my service on behalf of Pennsylvania. Like you, I am very concerned about the increased cost of gasoline and other fuels. High energy prices hurt the wallets of households across the country and pose a serious threat to our economy. It also is troubling that we continue to import billions of barrels of oil every year from unfriendly and unstable parts of the world. Clearly, we need to advance policies that tackle these problems and help Americans who are concerned about how much they are paying at the pump. First and foremost, we need to produce significantly more energy here at home and put our country on the right track towards energy independence and affordable fuels. It is for this reason that I have been disappointed by the President's reluctance to a significant expansion of oil exploration and energy production within our own borders, including in the north Alaska coast. More oil production in the United States - both offshore and on land - will create jobs and bring new supplies to market, making us less dependent on the Middle East for our energy security. I will continue working with my Senate colleagues on policies that will bolster domestic oil production.
Originally posted by butcherguy
Judging by his response, one might suppose that the letter that I sent him was in support of fracking when it was exactly the opposite.
Originally posted by Elliot
With great respect, earthquakes are not only caused by gradual earth movements of the plates.
For example, in Switzerland hot rock energy explorations had to be stopped because drilling was causing earthquakes and damaging many buildings.
WE can cause earthquakes by our activities.
Land subsidence in the San Joaquin Valley was first noted in 1935 when I. H. Althouse, a consulting engineer, called attention to the possibility of land subsidence near the Delano (Tulare-Wasco) area. The process was first described in print by Ingerson (1941, p. 40–42), who presented a map and profiles of land subsidence based on comparison of leveling of 1902, 1930, and 1940., (snip)
Four types of subsidence are known to occur in the San Joaquin Valley. In order of decreasing magnitude they are (1) subsidence caused by aquifersystem compaction due to the lowering of ground-water levels by sustained ground-water overdraft; (2) subsidence caused by the hydrocompaction of moisture-deficient deposits above the watertable; (3) subsidence related to fluid withdrawal from oil and gas fields; and (4) subsidence related to crustal neotectonic movements. Aquifer-system compaction and hydrocompaction have significantly lowered the land surface in the valley since about the 1920s, (snip) note: italics are mine
MANY COSTS OF LAND SUBSIDENCE ARE HIDDEN
The economic impacts of land subsidence in the San Joaquin Valley are not well known. Damages directly related to subsidence have been identified, and some have been quantified. Other damages indirectly related to subsidence, such as flooding and long-term environmental effects, merit additional assessment. Some of the direct damages have included decreased storage in aquifers, partial or complete submergence of canals and associated bridges and pipe crossings, collapse of well casings, and disruption of collector drains and irrigation ditches. Costs associated with these damages have been conservatively estimated at $25,000,000 (EDAW-ESA, 1978). These estimates are not adjusted for changing valuation of the dollar, and do not fully account for the underreported costs associated with well rehabilitation and replacement. (snip)