Seismoelectric imaging of shallow targets
- 出版日期：2005.
- 页数：1 v. :
- 第一责任说明：Seth Storey Haines.
- 分类号：a631
- ISBN：0496135066(ebk.) :
MARC全文
02h0031120 20120913133719.0 cr un||||||||| 120913s2005 xx ||||f|||d||||||||eng | 3153060 0496135066(ebk.) : CNY371.35 NGL NGL NGL a631 Haines, Seth Storey. Seismoelectric imaging of shallow targets [electronic resource] / Seth Storey Haines. 2005. 1 v. : digital, PDF file. Adviser: Klemperer, Simon L. Thesis (Ph.D.)--Stanford University, 2005. I have developed experimental methods in seismoelectrics in order to image targets in the shallow subsurface, motivated by theoretical predictions that the seismoelectric method recording seismic-to-electric conversions) can provide useful, and otherwise unattainable, in formation about thin layers and permeability and chemical property contrasts. I approach this problem with a combination of field experimentation, data processing algorithm development, and numerical modeling. My field experiments demonstrate the existence of a previously-undocumented seismoelectric phenomena which I term the "direct field". It is the electric field of an electric dipole created by the asymmetrical pressure field created at the location of an impact source e.g. sledgehammer). I also document the Lorentz field created by the motion of a metal hammer plate in the Earths magnetic field. Identification of these fields permits more accurate interpretation of seismoelectric records, and easier identification of the "interface response", which is the signal of interest. My field experiments with sources and receivers on opposite sides of two man-made trenches show the "coseismic field" carried within the seismic P-wave arriving at the receivers after the interface response from the trenches. Seismoelectric data processing must extract the interface response from the recorded data. I use established methods to remove the 60 Hz power grid energy and to reduce cultural and atmospheric electrical noise. Beyond existing work, I use real and synthetic data examples to show that non-stationary prediction-error filters PEFs) provide the most universally-effective option for separating the interface response from the coseismic noise. Linear radon transforms can also be quite effective if data are of adequate quality and include a sufficient number of recording channels &sim；48). I present the first-ever multichannel seismoelectric image supported by numerical modeling. Data were recorded with nine explosive shots recorded by 48 electrical channels. The image is produced by stacking the gathers from each shot, and is supported by a complementary image produced through numerical modeling. Further numerical models provide insight into the effectiveness of the seismoelectric method for imaging various targets and confirm that the seismoelectric method can provide useful new information about small targets and chemical property changes. Seismology. ; Prospecting Geophysical methods. aeBook. aCN bNGL http://pqdt.bjzhongke.com.cn/Detail.aspx?pid=%2fJQNO%2fMtln0%3d NGL Bs1656 rCNY371.35 ; h1 bs1205