Applications of time series analysis to geophysical data
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution June, 1980 This thesis consists of three papers applying the techniques of time series analysis to geophysical data. S...
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Massachusetts Institute of Technology and Woods Hole Oceanographic Institution
1980
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/1611 2023-05-15T17:41:42+02:00 Applications of time series analysis to geophysical data Chave, Alan D. Walvis Ridge South Atlantic Ocean 1980-06 application/pdf https://hdl.handle.net/1912/1611 en_US eng Massachusetts Institute of Technology and Woods Hole Oceanographic Institution WHOI Theses https://hdl.handle.net/1912/1611 doi:10.1575/1912/1611 doi:10.1575/1912/1611 Geomagnetism Electromagnetic fields Marine sediments Paleomagnetism Geophysics Marine geophysics Atlantis II (Ship : 1963-) Cruise AII94 Thesis 1980 ftwhoas https://doi.org/10.1575/1912/1611 2022-05-28T22:57:17Z Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution June, 1980 This thesis consists of three papers applying the techniques of time series analysis to geophysical data. Surface wave dispersion along the Walvis Ridge, South Atlantic Ocean, is obtained by bandpass filtering the recorded seismogram in the frequency domain. The group velocity is anomalously low in the period range of 15-50 s, and formal inversion of the data indicates both crustal thickening to 12.5 km and low shear velocity (4.25-4.35 km/s) to depths of 40-50 km. The electromagnetic induction fields at a deep ocean site northeast of Hawaii were used to determine the electrical conductivity of the earth to 400 km depth. Singular value decomposition of the data matrix indicates three degrees of freedom, suggesting source field complications and a two dimensional conductive structure. Inversion of one of the principal terms in the response function shows an abrupt rise in electrical conductivity to 0.05 mho/m near 160 km with no resolvable decrease below this. A model study suggests that moving source fields influence the induction appreciably in the other principal response tunction. A set of piston cores from the northeast Atlantic Ocean are used to construct paleomagnetic time series covering the interval 25-127 kybp. Stratigraphic control is provided by counts of planktonic toraminifera, and empirical orthogonal function analysis shows a significant decrease in sedimentation rate at the interglaciai/glacial transition. The sediments are magnetically stable and reliable relative paleointensity measurements could be obtained. Spectral analysis of the directions reveals a predominant 10 ky periodicity and no dominant looping direction. I was supported for the early parts of this work by a NSF Graduate Fellowship. The Walvis Ridge study was supported by the WHOI Education Office and the Defense Advanced Research ... Thesis Northeast Atlantic South Atlantic Ocean Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Woods Hole, MA |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Geomagnetism Electromagnetic fields Marine sediments Paleomagnetism Geophysics Marine geophysics Atlantis II (Ship : 1963-) Cruise AII94 |
spellingShingle |
Geomagnetism Electromagnetic fields Marine sediments Paleomagnetism Geophysics Marine geophysics Atlantis II (Ship : 1963-) Cruise AII94 Chave, Alan D. Applications of time series analysis to geophysical data |
topic_facet |
Geomagnetism Electromagnetic fields Marine sediments Paleomagnetism Geophysics Marine geophysics Atlantis II (Ship : 1963-) Cruise AII94 |
description |
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution June, 1980 This thesis consists of three papers applying the techniques of time series analysis to geophysical data. Surface wave dispersion along the Walvis Ridge, South Atlantic Ocean, is obtained by bandpass filtering the recorded seismogram in the frequency domain. The group velocity is anomalously low in the period range of 15-50 s, and formal inversion of the data indicates both crustal thickening to 12.5 km and low shear velocity (4.25-4.35 km/s) to depths of 40-50 km. The electromagnetic induction fields at a deep ocean site northeast of Hawaii were used to determine the electrical conductivity of the earth to 400 km depth. Singular value decomposition of the data matrix indicates three degrees of freedom, suggesting source field complications and a two dimensional conductive structure. Inversion of one of the principal terms in the response function shows an abrupt rise in electrical conductivity to 0.05 mho/m near 160 km with no resolvable decrease below this. A model study suggests that moving source fields influence the induction appreciably in the other principal response tunction. A set of piston cores from the northeast Atlantic Ocean are used to construct paleomagnetic time series covering the interval 25-127 kybp. Stratigraphic control is provided by counts of planktonic toraminifera, and empirical orthogonal function analysis shows a significant decrease in sedimentation rate at the interglaciai/glacial transition. The sediments are magnetically stable and reliable relative paleointensity measurements could be obtained. Spectral analysis of the directions reveals a predominant 10 ky periodicity and no dominant looping direction. I was supported for the early parts of this work by a NSF Graduate Fellowship. The Walvis Ridge study was supported by the WHOI Education Office and the Defense Advanced Research ... |
format |
Thesis |
author |
Chave, Alan D. |
author_facet |
Chave, Alan D. |
author_sort |
Chave, Alan D. |
title |
Applications of time series analysis to geophysical data |
title_short |
Applications of time series analysis to geophysical data |
title_full |
Applications of time series analysis to geophysical data |
title_fullStr |
Applications of time series analysis to geophysical data |
title_full_unstemmed |
Applications of time series analysis to geophysical data |
title_sort |
applications of time series analysis to geophysical data |
publisher |
Massachusetts Institute of Technology and Woods Hole Oceanographic Institution |
publishDate |
1980 |
url |
https://hdl.handle.net/1912/1611 |
op_coverage |
Walvis Ridge South Atlantic Ocean |
genre |
Northeast Atlantic South Atlantic Ocean |
genre_facet |
Northeast Atlantic South Atlantic Ocean |
op_source |
doi:10.1575/1912/1611 |
op_relation |
WHOI Theses https://hdl.handle.net/1912/1611 doi:10.1575/1912/1611 |
op_doi |
https://doi.org/10.1575/1912/1611 |
op_publisher_place |
Woods Hole, MA |
_version_ |
1766143399239352320 |