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With supporting geochemical evidence, they showed that oil produced from reservoirs in central Illinois could have been generated from the New Albany Shale in the deep basin, and then migrated from south to north for over 100 km.
The New Madrid Seismic Zone, which spans southwestern Kentucky, southeastern Missouri, northeastern Arkansas, and northwestern Tennessee, is the most seismically active area in North America east of the Rocky Mountains. In 1811-1812, this zone was the source area of three earthquakes of moment magnitude M > 8 , among the largest known intraplate earthquakes (Braile and others, 1982, 1 9 8 6 ) . Reactivation of preexisting faults under a contemporary maximum horizontal principal stress direction trending east-northeast was suggested by Braile and others ( 1 9 8 2 ) .
INDUCED SEISMICITY Various types of human activity can induce seismicity, a phenomenon which has been recognized since an increase of local earthquakes was noted in 1945 to accompany the filling of Lake Mead on the Arizona-Nevada border (Scholz, 1990). Seismicity may either be an immediate response to the increased subsurface stress resulting from surface reservoir loading, or may be delayed for some years until the regional pore pressure is able to readjust to a higher value. Earthquakes may also result from mining activity (McGarr, 1994) or from subsurface waste disposal (Nicholson and Wesson, 1992). In oilfield operations, earthquakes may be induced by water injection for secondary recovery, well stimulation by hydraulic fracturing, or as a consequence of primary oil and gas production (Doser and others, 1992; Grasso, 1992).
Originally posted by herenow
This webicorder now has no data
Anyone else having that problem?
Planned IRIS DMC Database maintenance Thursday Morning, Feb 24, 2011 at 10AM PST 02/23/2011