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Deformation rates across the San And...

Titus, Sarah J.

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Deformation rates across the San Andreas Fault system, central California determined by geology and geodesy.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Deformation rates across the San Andreas Fault system, central California determined by geology and geodesy./
作者:	Titus, Sarah J.
面頁冊數:	185 p.
附註:	Adviser: Basil Tikoff.
Contained By:	Dissertation Abstracts International67-06B.
標題:	Geology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3222791
ISBN:	9780542752926

Deformation rates across the San Andreas Fault system, central California determined by geology and geodesy.
Titus, Sarah J.

Deformation rates across the San Andreas Fault system, central California determined by geology and geodesy. - 185 p.

Adviser: Basil Tikoff.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2006.

The San Andreas fault system is a transpressional plate boundary characterized by sub-parallel dextral strike-slip faults separating internally deformed crustal blocks in central California. Both geodetic and geologic tools were used to understand the short- and long-term partitioning of deformation in both the crust and the lithospheric mantle across the plate boundary system.

ISBN: 9780542752926Subjects--Topical Terms:

516570
Geology.

Deformation rates across the San Andreas Fault system, central California determined by geology and geodesy.
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245 1 0 $a Deformation rates across the San Andreas Fault system, central California determined by geology and geodesy.
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520 $a The San Andreas fault system is a transpressional plate boundary characterized by sub-parallel dextral strike-slip faults separating internally deformed crustal blocks in central California. Both geodetic and geologic tools were used to understand the short- and long-term partitioning of deformation in both the crust and the lithospheric mantle across the plate boundary system.
520 $a GPS data indicate that the short-term discrete deformation rate is &sim;28 mm/yr for the central creeping segment of the San Andreas fault and increases to 33 mm/yr at +/-35 km from the fault. This gradient in deformation rates is interpreted to reflect elastic locking of the creeping segment at depth, distributed off-fault deformation, or some combination of these two mechanisms. These short-term fault-parallel deformation rates are slower than the expected geologic slip rate and the relative plate motion rate.
520 $a Structural analysis of folds and transpressional kinematic modeling were used to quantify long-term distributed deformation adjacent to the Rinconada fault. Folding accommodates approximately 5 km of wrench deformation, which translates to a deformation rate of &sim;1 mm/yr since the start of the Pliocene. Integration with discrete offset on the Rinconada fault indicates that this portion of the San Andreas fault system is approximately 80% strike-slip partitioned. This kinematic fold model can be applied to the entire San Andreas fault system and may explain some of the across-fault gradient in deformation rates recorded by the geodetic data.
520 $a Petrologic examination of mantle xenoliths from the Coyote Lake basalt near the Calaveras fault was used to link crustal plate boundary deformation at the surface with models for the accommodation of deformation in the lithospheric mantle. Seismic anisotropy calculations based on xenolith petrofabrics suggest that an anisotropic mantle layer thickness of 35-85 km is required to explain the observed shear wave splitting delay times in central California. The available data are most consistent with models for a broad zone of distributed deformation in the lithospheric mantle.
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