Statistics – Methodology
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmgp44a..06m&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #GP44A-06
Statistics
Methodology
1525 Paleomagnetism Applied To Tectonics: Regional, Global, 8107 Continental Neotectonics (8002), 8158 Plate Motions: Present And Recent (3040)
Scientific paper
Paleomagnetic and Global Positioning System (GPS) geodetic data can both be used to measure vertical axis rotation rates in crustal rocks. Paleomagnetic data sample the history of finite rotations from some past interval of time but the tectonic setting of the rotations may be unclear. Moreover, recent rotations are difficult, and instantaneous rotation rates impossible, to detect. Modern GPS observations measure the current, decade-scale instantaneous rotation rates and help provide the tectonic setting. We estimate modern-day vertical axis rotations of crustal blocks from several deforming zones by inversion of GPS velocities. The methodology attempts to account for elastic deformation that can be strong in short-term geodetic deformation fields. In general the geodetic estimates of rotation rates compare very well to several- million-year-scale rotation rates derived from paleomagnetic observaions. The most rapid modern rotations appear to occur near subduction zones. In the US Pacific Northwest, even a fine scale feature such as the rapid landward decrease in rotation rate evident in 12-15 Ma Columbia River basalt flows is faithfully recorded in 12-years of GPS data. However, in some cases, notably the California Transverse Ranges, rapid rotations evident in paleomagnetic data do not appear to be continuing today. I will discuss how we extract rotations from geodetic data and how these compare to paleomagnetic results in the western US, New Zealand and other parts of the world.
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