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Spatial Analysis of PM2.5 Air Pollut...

Lippoldt, Rachel.

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Spatial Analysis of PM2.5 Air Pollution in Association with Hospital Admissions in California.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Spatial Analysis of PM2.5 Air Pollution in Association with Hospital Admissions in California./
Author:	Lippoldt, Rachel.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
Description:	102 p.
Notes:	Source: Dissertations Abstracts International, Volume: 80-08, Section: A.
Contained By:	Dissertations Abstracts International80-08A.
Subject:	Geology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=11017274

Spatial Analysis of PM2.5 Air Pollution in Association with Hospital Admissions in California.
Lippoldt, Rachel.

Spatial Analysis of PM2.5 Air Pollution in Association with Hospital Admissions in California. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 102 p.

Source: Dissertations Abstracts International, Volume: 80-08, Section: A.

Thesis (Ph.D.)--University of Southern California, 2018.

This item must not be sold to any third party vendors.

A dislocation model has been used to interpret the spatial distribution and focal mechanisms of deep off-fault seismicity adjacent to the southern terminus of the creeping section of the San Andreas Fault in Central California, near Parkfield. The most significant feature of the spatial distribution is a prominent seismic lineation that intersects the fault near the SAFOD borehole northwest of Parkfield and strikes southeast making a 20 degree angle with the trace of the San Andreas Fault. This feature can be explained by the termination of a creeping dislocation beneath the seismogenic layer which deepens to the southeast. The stress field corresponding to this dislocation is consistent with surface topography and the focal mechanisms of small off-fault earthquakes. A shear wave velocity model obtained using ambient noise tomography supports this inferred geometry of a deepening dislocation. Low-frequency earthquakes are associated with a low- velocity structure that deepens to the southeast of Parkfield along strike. This plunging low shear velocity structure can be interpreted as representing weaker materials or the presence of fluids and elevated pore pressures and is consistent with materials more prone to creep. This suggests that there may be a structural or rheological control on the occurrence of creep at depth. In order to investigate how creep events propagate in the brittle-ductile regime, a one-dimensional finite-difference spring-mass-dashpot model was used to show that a viscous fault plane pinned by an array of brittle asperities can produce slow slip propagation speeds in the observed range of kilometer per hour to kilometer per day. For physically reasonable values of wall rock elasticity, viscosity, and fault zone width, the model is able to produce propagation speeds consistent with observed tremor migration in subduction zones and at the base of large strike-slip faults.Subjects--Topical Terms:

516570
Geology.

Spatial Analysis of PM2.5 Air Pollution in Association with Hospital Admissions in California.
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245 1 0 $a Spatial Analysis of PM2.5 Air Pollution in Association with Hospital Admissions in California.
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300 $a 102 p.
500 $a Source: Dissertations Abstracts International, Volume: 80-08, Section: A.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Sammis, Charles.
502 $a Thesis (Ph.D.)--University of Southern California, 2018.
506 $a This item must not be sold to any third party vendors.
520 $a A dislocation model has been used to interpret the spatial distribution and focal mechanisms of deep off-fault seismicity adjacent to the southern terminus of the creeping section of the San Andreas Fault in Central California, near Parkfield. The most significant feature of the spatial distribution is a prominent seismic lineation that intersects the fault near the SAFOD borehole northwest of Parkfield and strikes southeast making a 20 degree angle with the trace of the San Andreas Fault. This feature can be explained by the termination of a creeping dislocation beneath the seismogenic layer which deepens to the southeast. The stress field corresponding to this dislocation is consistent with surface topography and the focal mechanisms of small off-fault earthquakes. A shear wave velocity model obtained using ambient noise tomography supports this inferred geometry of a deepening dislocation. Low-frequency earthquakes are associated with a low- velocity structure that deepens to the southeast of Parkfield along strike. This plunging low shear velocity structure can be interpreted as representing weaker materials or the presence of fluids and elevated pore pressures and is consistent with materials more prone to creep. This suggests that there may be a structural or rheological control on the occurrence of creep at depth. In order to investigate how creep events propagate in the brittle-ductile regime, a one-dimensional finite-difference spring-mass-dashpot model was used to show that a viscous fault plane pinned by an array of brittle asperities can produce slow slip propagation speeds in the observed range of kilometer per hour to kilometer per day. For physically reasonable values of wall rock elasticity, viscosity, and fault zone width, the model is able to produce propagation speeds consistent with observed tremor migration in subduction zones and at the base of large strike-slip faults.
590 $a School code: 0208.
650 4 $a Geology. $3 516570
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710 2 $a University of Southern California. $3 700129
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793 $a English
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