A unified analysis of crustal motion in Southern California, 1970–2004: The SCEC crustal motion map
To determine crustal motions in and around southern California, we have processed and combined trilateration data collected from 1970 to 1992, VLBI data from 1979 to 1992, and GPS data from 1986 to 2004: a long temporal coverage required in part by the occurrence of several large earthquakes in this...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | en_US |
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American Geophysical Union (AGU)
2014
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| Online Access: | http://hdl.handle.net/1721.1/85589 |
| _version_ | 1826188880392486912 |
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| author | Shen, Z.-K. Agnew, D. C. Wang, M. Dong, D. Fang, P. King, Robert W Herring, Thomas A |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Shen, Z.-K. Agnew, D. C. Wang, M. Dong, D. Fang, P. King, Robert W Herring, Thomas A |
| author_sort | Shen, Z.-K. |
| collection | MIT |
| description | To determine crustal motions in and around southern California, we have processed and combined trilateration data collected from 1970 to 1992, VLBI data from 1979 to 1992, and GPS data from 1986 to 2004: a long temporal coverage required in part by the occurrence of several large earthquakes in this region. From a series of solutions for station positions, we have estimated interseismic velocities, coseismic displacements, and postseismic motions. Within the region from 31°N to 38°N. and east to 114°W, the final product includes estimated horizontal velocities for 1009 GPS, 190 trilateration, and 16 VLBI points, with ties between some of these used to stabilize the solution. All motions are relative to the Stable North American Reference Frame (SNARF) as realized through the velocities of 20 GPS stations. This provides a relatively dense set of horizontal velocity estimates, with well-tested errors, for the past quarter century over the plate boundary from 31°N to 36.5°N. These velocities agree well with those from the Plate Boundary Observatory, which apply to a later time period. We also estimated vertical velocities, 533 of which have errors below 2 mm/yr. Most of these velocities are less than 1 mm/yr, but they show 2–4 mm/yr subsidence in the Ventura and Los Angeles basins and in the Salton Trough. Our analysis also included estimates of coseismic and postseismic motions related to the 1992 Landers, 1994 Northridge, 1999 Hector Mine, and 2003 San Simeon earthquakes. Postseismic motions increase logarithmically over time with a time constant of about 10 days, and generally mimic the direction and relative amplitude of the coseismic offsets. |
| first_indexed | 2024-09-23T08:06:25Z |
| format | Article |
| id | mit-1721.1/85589 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T08:06:25Z |
| publishDate | 2014 |
| publisher | American Geophysical Union (AGU) |
| record_format | dspace |
| spelling | mit-1721.1/855892024-05-15T02:50:46Z A unified analysis of crustal motion in Southern California, 1970–2004: The SCEC crustal motion map Shen, Z.-K. Agnew, D. C. Wang, M. Dong, D. Fang, P. King, Robert W Herring, Thomas A Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences King, Robert W. Herring, Thomas A. To determine crustal motions in and around southern California, we have processed and combined trilateration data collected from 1970 to 1992, VLBI data from 1979 to 1992, and GPS data from 1986 to 2004: a long temporal coverage required in part by the occurrence of several large earthquakes in this region. From a series of solutions for station positions, we have estimated interseismic velocities, coseismic displacements, and postseismic motions. Within the region from 31°N to 38°N. and east to 114°W, the final product includes estimated horizontal velocities for 1009 GPS, 190 trilateration, and 16 VLBI points, with ties between some of these used to stabilize the solution. All motions are relative to the Stable North American Reference Frame (SNARF) as realized through the velocities of 20 GPS stations. This provides a relatively dense set of horizontal velocity estimates, with well-tested errors, for the past quarter century over the plate boundary from 31°N to 36.5°N. These velocities agree well with those from the Plate Boundary Observatory, which apply to a later time period. We also estimated vertical velocities, 533 of which have errors below 2 mm/yr. Most of these velocities are less than 1 mm/yr, but they show 2–4 mm/yr subsidence in the Ventura and Los Angeles basins and in the Salton Trough. Our analysis also included estimates of coseismic and postseismic motions related to the 1992 Landers, 1994 Northridge, 1999 Hector Mine, and 2003 San Simeon earthquakes. Postseismic motions increase logarithmically over time with a time constant of about 10 days, and generally mimic the direction and relative amplitude of the coseismic offsets. 2014-03-10T18:53:30Z 2014-03-10T18:53:30Z 2011-11 2011-08 Article http://purl.org/eprint/type/JournalArticle 0148-0227 2156-2202 http://hdl.handle.net/1721.1/85589 Shen, Z.-K., R. W. King, D. C. Agnew, M. Wang, T. A. Herring, D. Dong, and P. Fang. “A Unified Analysis of Crustal Motion in Southern California, 1970–2004: The SCEC Crustal Motion Map.” Journal of Geophysical Research 116, no. B11 (2011). Copyright © 2011 by the American Geophysical Union en_US http://dx.doi.org/10.1029/2011jb008549 Journal of Geophysical Research Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Geophysical Union (AGU) Other univ. web domain |
| spellingShingle | Shen, Z.-K. Agnew, D. C. Wang, M. Dong, D. Fang, P. King, Robert W Herring, Thomas A A unified analysis of crustal motion in Southern California, 1970–2004: The SCEC crustal motion map |
| title | A unified analysis of crustal motion in Southern California, 1970–2004: The SCEC crustal motion map |
| title_full | A unified analysis of crustal motion in Southern California, 1970–2004: The SCEC crustal motion map |
| title_fullStr | A unified analysis of crustal motion in Southern California, 1970–2004: The SCEC crustal motion map |
| title_full_unstemmed | A unified analysis of crustal motion in Southern California, 1970–2004: The SCEC crustal motion map |
| title_short | A unified analysis of crustal motion in Southern California, 1970–2004: The SCEC crustal motion map |
| title_sort | unified analysis of crustal motion in southern california 1970 2004 the scec crustal motion map |
| url | http://hdl.handle.net/1721.1/85589 |
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