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Not sure what you mean. The North American plate is moving to the west/southwest and the JDF/Gorda is moving east. Hence the subduction.
2012/02/10 23:58:17 2012/02/11 02:58:17 -37.464 -73.894 19.5 5.9 Ml GUC Si 27 km al NO de Lebu
11 FEB 2012 ( 42)
ot = 02:58:23.40 +/- 1.39 BIO-BIO, CHILE
lat = -37.286 +/- 8.4
lon = -73.205 +/- 12.7 MAGNITUDE 5.9 (GS)
dep = 35.0 +/- 2.8
52 km (32 miles) SSW of Concepcion, Bio-Bio, Chile (pop 212,000)
54 km (33 miles) NE of Lebu, Bio-Bio, Chile (pop 20,000)
78 km (49 miles) WNW of Los Angeles, Bio-Bio, Chile (pop 117,000)
484 km (301 miles) SSW of SANTIAGO, Region Metropolitana, Chile
nph = 310 of 332 se = 0.68 FE=135 A
error ellipse = (264.0, 0.0, 19.3;174.0, 1.0, 12.7; 16.0, 88.0, 4.2)
mb = 5.6 (300) ML = 6.2 ( 10) mblg = 5.3 ( 11) md = 0.0 ( 0) MS = 0.0 ( 0)
Originally posted by PuterMan
And what of oceanic convergence at plate boundaries with no subduction and no activity? How does one explain that?
We know the planet is not growing from GPS readings, so expanding earth theory is out.
Abstract—Physical evidence indicates that a thermally driven Earth, plate
tectonics, and elastic rebound theory violate fundamental physical principles,
and that Earth is a quantified solid body, the size of which possibly increases
“It is significant to note that Robaudo and Harrison ‘expected that most VLBI stations will have up-down [radial] motions of only a few mm/year,’ and they then recommended that the vertical motion be ‘restricted to zero, because [they considered that] this is closer to the true situation than an average motion of 18mm/year.’
“Robaudo and Harrison were, in fact, faced with a daunting problem. When they calculated the global geodetic network from 15 years’ worth of observational data, they found, but failed to acknowledge, that the Earth was expanding by 18 millimetres per year. This value is very close to the value of 22 millimetres per year calculated here using oceanic mapping, especially when error margins are also considered.” (Terra Non Firma Earth, pp. 130-31, citing S. Robaudo and C.G. Harrison (1993) “Plate Tectonics from SLR and VLBI global data,” in D.E. Smith and D.L. Turcotte, eds., Contributions of Space Geodesy to Geodynamics: Crustal Dynamics, Geodynamics Series, Volume 23, American Geophysical Union.)
Reposting from an earlier discussion I participated in over at Astronomy.cast (PT episode):
The team applied a new data calculation technique to estimate the rate of change in the solid Earth's average radius over time, taking into account the effects of other geophysical processes. The previously discussed geodetic techniques (satellite laser ranging, very-long baseline interferometry and GPS) were used to obtain data on Earth surface movements from a global network of carefully selected sites. These data were then combined with measurements of Earth's gravity from NASA's Gravity Recovery and Climate Experiment (GRACE) spacecraft and models of ocean bottom pressure, which help scientists interpret gravity change data over the ocean.
The result? The scientists estimated the average change in Earth's radius to be 0.004 inches (0.1 millimeters) per year, or about the thickness of a human hair, a rate considered statistically insignificant.
"Our study provides an independent confirmation that the solid Earth is not getting larger at present, within current measurement uncertainties," said Wu.
This study is based on data derived from fifteen years of observations of the SLR (side-looking radar) network and six years of the VLBI (very long baseline interferometry) network. In order to use all available information VLBI and SLR global data sets were combined in a least squares fashion to calculate station horizontal velocities. All significant data pertaining to a single site contribute to the station horizontal motion. The only constraint on the solution is that no vertical motion is allowed.
I think the important thing to remember is that until proven to be fact, everything is just theory.