| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
DEPARTMENT OF EARTH AND PLANETARY SCIENCE MASSACHUSETTS INSTITUTE OF TECHNOLOGY, CAMBRIDGE, MASSACHUSETTS 02139
APPLIED SEISMOLOGY GROUP LINCOLN LABORATORY MASSACHUSETTS INSTITUTE OF TECHNOLOGY, CAMBRIDGE, MASSACHUSETTS 02142
NTNF/NORSAR, KJELLER, Norway
Abstract
Using P-wave residuals for teleseismic events observed at the Montana Large Aperture Seismic Array (LASA), we have determined the three-dimensional seismic structure of the lithosphere under the array to a depth of 140 km. The root-mean-square velocity fluctuation was found to be at least 3.2 per cent which may be compared to estimate of ca. 2 per cent based on the Chernov random medium theory. The solutions are given by both the generalized inverse and stochastic inverse methods in order to demonstrate the relative merit of different inversion techniques.
The most conspicuous feature of the lithosphere under LASA is a low-velocity anomaly in the central and northeast part of the array siting area with the N60°E trend and persisting from the upper crust to depths greater than 100 km. We interpret this low-velocity anomaly as a zone of weakness caused by faulting and shearing associated with the building of the Rocky Mountains.
Footnotes
* On leave of absence from Department of Statistics, University of Uppsala, Uppsala, Sweden.
Ordering of authors is alphabetical.
This article has been cited by other articles:
|
|
 |
|
  W. Menke, R. C. Holmes, and J. Xie On the Nonuniqueness of the Coupled Origin Time-Velocity Tomography Problem Bulletin of the Seismological Society of America, June 1, 2006; 96(3): 1131 - 1139. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
L.-Y. SUNG and D. D. JACKSON Crustal and uppermost mantle structure under southern California Bulletin of the Seismological Society of America, April 1, 1992; 82(2): 934 - 961. [Abstract] [PDF]
|
|
|
|
|
|
D. R. BAUMGARDT and S. S. ALEXANDER Structure of the mantle beneath Montana LASA from analysis of long-period, mode-converted phases Bulletin of the Seismological Society of America, October 1, 1984; 74(5): 1683 - 1702. [Abstract] [PDF]
|
|
|
|
|
|
F. RINGDAL and E. S. HUSEBYE Application of arrays in the detection, location, and identification of seismic events Bulletin of the Seismological Society of America, December 1, 1982; 72(6B): S201 - S224. [Abstract] [PDF]
|
|
|
|
|
|
R. B. HERRMANN Digital processing of regional network data Bulletin of the Seismological Society of America, December 1, 1982; 72(6B): S261 - S276. [Abstract] [PDF]
|
|
|
|
|
|
K. AKI Scattering and attenuation Bulletin of the Seismological Society of America, December 1, 1982; 72(6B): S319 - S330. [Abstract] [PDF]
|
|
|
|
|
|
C. S. MCCREERY and G. H. SUTTON Wave train characteristics of long-range, high-frequency Pn,Sn crossing an ocean bottom hydrophone array Bulletin of the Seismological Society of America, April 1, 1980; 70(2): 437 - 446. [Abstract] [PDF]
|
|
|
|
|
|
B. J. MITCHELL, C. C. CHENG, and W. STAUDER A three-dimensional velocity model of the lithosphere beneath the new Madrid seismic zone Bulletin of the Seismological Society of America, August 1, 1977; 67(4): 1061 - 1074. [Abstract] [PDF]
|
|
|
|
|
|
W. H. MENKE Lateral inhomogeneities in P velocity under the Tarbela array of the lesser Himalayas of Pakistan Bulletin of the Seismological Society of America, June 1, 1977; 67(3): 725 - 734. [Abstract] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
