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Constraints on Jalisco Block Motion and Tectonics of the Guadalajara Triple Junction from 1998–2001 Campaign GPS Data

Selvans, Michelle M. and Stock, Joann M. and DeMets, Charles and Sanchez, Osvaldo and Marquez-Azua, Bertha (2011) Constraints on Jalisco Block Motion and Tectonics of the Guadalajara Triple Junction from 1998–2001 Campaign GPS Data. Pure and Applied Geophysics, 168 (8-9). pp. 1435-1447. ISSN 0033-4553. doi:10.1007/s00024-010-0201-2.

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A GPS campaign network in the state of Jalisco was occupied for ~36 h per station most years between 1995 and 2005; we use data from 1998–2001 to investigate tectonic motion and interseismic deformation in the Jalisco area with respect to the North America plate. The twelve stations used in this analysis provide coverage of the Jalisco Block and adjacent North America plate, and show a pattern of motion that implies some contribution to Jalisco Block boundary deformation from both tectonic motion and interseismic deformation due to the offshore 1995 earthquake. The consistent direction and magnitude of station motion on the Jalisco Block with respect to the North America reference frame, ~2 mm/year to the southwest (95% confidence level), perhaps can be attributed to tectonic motion. However, some station velocities within and across the boundaries of the Jalisco Block are also non-zero (95% confidence level), and the overall pattern of station velocities indicates both viscoelastic response to the 1995 earthquake and partial coupling of the subduction interface (together termed "interseismic deformation"). Our results show motion across the northern Colima rift, the eastern boundary of the Jalisco Block, which is likely to be sinistral oblique extension rather than pure extension. We constrain extension across both the Colima rift and the northeastern boundary of the Jalisco Block, the Tepic- Zacoalco rift, to ≤8 mm/year (95% confidence level), slow compared to relative rates of motion at nearby plate boundaries.

Item Type:Article
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URLURL TypeDescription ReadCube access
Stock, Joann M.0000-0003-4816-7865
DeMets, Charles0000-0001-7460-1165
Additional Information:© 2011 Springer Basel AG. Received February 10, 2010, revised July 10, 2010, accepted September 28, 2010, Published online November 9, 2010. We would like to thank Jeff Genrich and Tom Herring for helpful discussions. Support for this research was provided by National Science Foundation grants EAR-0510395 (J. Stock) and EAR-0510553 (C. DeMets).
Group:Seismological Laboratory, Division of Geological and Planetary Sciences
Funding AgencyGrant Number
Subject Keywords:Colima rift; GPS; interseismic; Jalisco Block; Tepic-Zacoalco rift; triple junction
Issue or Number:8-9
Record Number:CaltechAUTHORS:20110801-133119672
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24616
Deposited On:01 Aug 2011 23:10
Last Modified:08 Nov 2022 22:12

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