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Structure, seismicity, and instrumen...

Wolin, Emily Lynne Gregonis.

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Structure, seismicity, and instrumentation of stable North American lithosphere.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Structure, seismicity, and instrumentation of stable North American lithosphere./
作者:	Wolin, Emily Lynne Gregonis.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
面頁冊數:	179 p.
附註:	Source: Dissertation Abstracts International, Volume: 77-08(E), Section: B.
Contained By:	Dissertation Abstracts International77-08B(E).
標題:	Geophysics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10044017
ISBN:	9781339554709

Structure, seismicity, and instrumentation of stable North American lithosphere.
Wolin, Emily Lynne Gregonis.

Structure, seismicity, and instrumentation of stable North American lithosphere. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 179 p.

Source: Dissertation Abstracts International, Volume: 77-08(E), Section: B.

Thesis (Ph.D.)--Northwestern University, 2016.

The work in this thesis covers a number of different fields in seismology. These can be divided into three parts. In the first, I discuss earthquakes that occur along the North American passive margin. In the second, I investigate the noise characteristics of Superior Rifting Earthscope Experiment (SPREE) seismic stations. In the third, I evaluate the predictions of pre-existing tomographic models, expand raypath coverage in eastern North America by fitting waveforms, and produce an updated tomographic model focusing on the structure of stable North American lithosphere.

ISBN: 9781339554709Subjects--Topical Terms:

535228
Geophysics.

Structure, seismicity, and instrumentation of stable North American lithosphere.
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500 $a Source: Dissertation Abstracts International, Volume: 77-08(E), Section: B.
500 $a Adviser: Suzan van der Lee.
502 $a Thesis (Ph.D.)--Northwestern University, 2016.
520 $a The work in this thesis covers a number of different fields in seismology. These can be divided into three parts. In the first, I discuss earthquakes that occur along the North American passive margin. In the second, I investigate the noise characteristics of Superior Rifting Earthscope Experiment (SPREE) seismic stations. In the third, I evaluate the predictions of pre-existing tomographic models, expand raypath coverage in eastern North America by fitting waveforms, and produce an updated tomographic model focusing on the structure of stable North American lithosphere.
520 $a First, I explore the rare, but moderate-to-large earthquakes that occur along the passive margin of North America, such as the August 2011 Mineral, Virginia earthquake. I discuss the tectonic setting, possible causes, and challenges of studying such earthquakes and propose directions for their future study. Examining the seismicity of the regions surrounding the 1929 Grand Banks and 1933 Baffin Bay earthquakes, I conclude that the aftershocks of these events continue today due to low strain rates along the margin. Second, I characterize the long-period noise characteristics of SPREE stations. At periods greater than 20 seconds, horizontal noise levels at SPREE stations vary seasonally and diurnally. I find that SPREE stations in sandy soil have the most consistent noise levels. Stations in fine-grained soil become extremely noisy during summer days, but very quiet when the surrounding soil freezes solid in winter.
520 $a Finally, I evaluate previous generations of tomographic models and develop my own. I calculate synthetic seismograms for three tomographic models and compare them to new observed seismograms from earthquakes in stable North America. I find that adding data to a tomographic model does not necessarily improve predictions of regional S and Rayleigh waveforms. With this in mind, I apply the method of partitioned waveform inversion to derive constraints on S-velocity structure. I add these constraints to those used in previous models and invert for a new velocity structure of North America. I find that vertical velocity structures tend to cluster by age and that a sub-Moho low velocity zone is widespread in Proterozoic lithosphere.
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