Skip to Main Content
 

Global Search Box

 
 
 
 

Files

File List


toledo1196909328.pdf (4.18 MB)

ETD Abstract Container

Abstract Header

A Passive Seismic Investigation of the Crustal Structure under Ohio

Brandeberry, Jessica L.
http://rave.ohiolink.edu/etdc/view?acc_num=toledo1196909328

Abstract Details

2007, Master of Science, University of Toledo, College of Arts and Sciences.
Although gravity and magnetic field data have been used to infer variations in the crustal structure of Ohio, seismic evidence regarding the depth to the Mohoroviĉic discontinuity is sparse. First arrivals from 13 regional earthquakes recorded by the Ohio Seismic Network between 2001 and 2006 were examined to investigate variations in crustal composition and thickness in Ohio and attempt to calculate the depth to the mantle. The average crustal structure consists of two layers: Paleozoic sedimentary rock over granitic crust (phase Pg) overlying the mantle (phase Pn). The average apparent P-wave velocities for the Paleozoic sedimentary rock and granitic crust are 4.8 km/s and 5.5 km/s respectively. Reduced travel time curves of first arrivals show nodirect evidence of a higher (~ 6.8 km/s) velocity lower crust (crustal phase Pb). Paleozoic sedimentary rock thickness, determined from well data, ranges from 700 m in western Ohio to over 4 km in southeastern Ohio. Calculated thicknesses of the Paleozoic sedimentary rock (-5.8 ± 8.8 km in western Ohio, 26.9 ± 25.8 km in southeastern Ohio) and granitic crust (20.1 ± 10.1 km in western Ohio, 57.6 ± 29.6 km in southeastern Ohio) beneath each station, determined from regional earthquake residuals (1.8 ±1.8 seconds early in western Ohio, 5.0 ± 5.4 seconds late in southeastern Ohio), have a mean value higher than thicknesses derived from well data and gravity and magnetic field interpretations. However, these results involve large standard deviations that span crustal models previously proposed. Comparing these thicknesses determined from regional earthquakes with thicknesses determined from teleseismic earthquakes and Earthscope Automated Receiver Survey (EARS) seismic data show small variations beneath most stations. Those stations with large variations between regionally, teleseismically, and EARS determined thicknesses also have a small number of regional earthquake observations.
Donald Stierman (Advisor)
263 p.
Geology; Geophysics
Seismic refraction; crustal structure; Ohio; Mohorovi&265; ic discontinuity

Recommended Citations

Citations

  • Brandeberry, J. L. (2007). A Passive Seismic Investigation of the Crustal Structure under Ohio [Master's thesis, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1196909328

    APA Style (7th edition)

  • Brandeberry, Jessica. A Passive Seismic Investigation of the Crustal Structure under Ohio. 2007. University of Toledo, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=toledo1196909328.

    MLA Style (8th edition)

  • Brandeberry, Jessica. "A Passive Seismic Investigation of the Crustal Structure under Ohio." Master's thesis, University of Toledo, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1196909328

    Chicago Manual of Style (17th edition)

toledo1196909328
868
© 2007, all rights reserved.
This open access ETD is published by University of Toledo and OhioLINK.