| Abstract: | The value of seismic-model studies as an aid to understanding wave propagation in the Earth‘s crust was recognized by early investigators (Tatel and Tuve, 1955). Preliminary model results were very promising, but progress in model seismology has been restricted by two problems: (1) difficulties in the development of models with continuously variable velocity-depth functions, and (2) difficulties in the construction of models of adequate size to provide a meaningful wave-length to layer-thickness ratio. The problem of a continuously variable velocity-depth function has been partly solved by a technique using two-dimensional plate models constructed by laminating plastic to aluminum, so that the ratio of plastic to aluminum controls the velocity-depth function (Healy and Press, 1960). These techniques provide a continuously variable velocity-depth function, but it is not possible to construct such models large enough to study short-period wave propagation in the crust. This report describes improvements in our ability to machine large models. Two types of models are being used: one is a cylindrical aluminum tube machined on a lathe, and the other is a large plate machined on a precision planer. Both of these modeling techniques give promising results and are a significant improvement over earlier efforts. |
| Genre: | USGS Unnumbered Series |
| ProdID: | 70039538 |
| Citation Author: | Healy, J.H.; Mangan, G.B., |
| Citation Contributing Office: | Earthquake Science Center |
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| Citation Language: | English |
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| Citation Number Of Pages: | 12 |
| Citation Online Only Flag: | Y |
| Citation Phsyical Description: | iv, 8 p. |
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| Citation Public Comments: | In cooperation with the Defense Advanced Research Projects Agency |
| Citation Publisher: | U.S. Geological Survey |
| Citation Series: | Crustal Studies Technical Letter |
| Citation Series Code: | |
| Citation Series Number: | 15 |
| Citation Search Results Text: | A progress report on seismic model studies; 1963; USGS Unnumbered Series; 15; Healy, J.H.; Mangan, G.B., |
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| Citation Year: | 1963 |
| Type: | citation/reference |
| Text: | A progress report on seismic model studies; 1963; USGS Unnumbered Series; 15; Healy, J.H.; Mangan, G.B., |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| URL (INDEX PAGE): | http://pubs.usgs.gov/misc/tl/0015/ |
| URL (DOCUMENT): | http://pubs.usgs.gov/misc/tl/0015/tl0015.pdf |
| Date Other: | Sun, 1 Jan 2012 00:00 -0600 |
| Publisher: | U.S. Geological Survey |
