Research Article| October 01, 2009 Seismicity and Stress in a Tectonically Complex Region: The Rivera Fracture Zone, the Rivera–Cocos Boundary, and the Southwestern Jalisco Block, Mexico John J. Sánchez; John J. Sánchez Centro de Sismología y Volcanología de Occidente-SisVOc , Universidad de Guadalajara–Centro Universitario de la Costa, Avenida Universidad 203, Puerto Vallarta, Jalisco 48280, Méxicojjsanchez@pv.udg.mxfcornu@pv.udg.mx Search for other works by this author on: GSW Google Scholar Francisco J. Núñez-Cornú Francisco J. Núñez-Cornú Centro de Sismología y Volcanología de Occidente-SisVOc , Universidad de Guadalajara–Centro Universitario de la Costa, Avenida Universidad 203, Puerto Vallarta, Jalisco 48280, Méxicojjsanchez@pv.udg.mxfcornu@pv.udg.mx Search for other works by this author on: GSW Google Scholar Author and Article Information John J. Sánchez Centro de Sismología y Volcanología de Occidente-SisVOc , Universidad de Guadalajara–Centro Universitario de la Costa, Avenida Universidad 203, Puerto Vallarta, Jalisco 48280, Méxicojjsanchez@pv.udg.mxfcornu@pv.udg.mx Francisco J. Núñez-Cornú Centro de Sismología y Volcanología de Occidente-SisVOc , Universidad de Guadalajara–Centro Universitario de la Costa, Avenida Universidad 203, Puerto Vallarta, Jalisco 48280, Méxicojjsanchez@pv.udg.mxfcornu@pv.udg.mx Publisher: Seismological Society of America First Online: 14 Jul 2017 Online ISSN: 1943-3573 Print ISSN: 0037-1106 Bulletin of the Seismological Society of America (2009) 99 (5): 2771–2783. https://doi.org/10.1785/0120080350 Article history First Online: 14 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation John J. Sánchez, Francisco J. Núñez-Cornú; Seismicity and Stress in a Tectonically Complex Region: The Rivera Fracture Zone, the Rivera–Cocos Boundary, and the Southwestern Jalisco Block, Mexico. Bulletin of the Seismological Society of America 2009;; 99 (5): 2771–2783. doi: https://doi.org/10.1785/0120080350 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin of the Seismological Society of America Search Advanced Search Abstract Fault plane solutions for a group of 41 4.9≤Mw≤8.0 earthquakes between November 1980 and May 2007, extracted from the Global Centroid Moment Tensor Project catalog, are used to investigate spatial and temporal variations of stress in the south part of the Jalisco block (JB). Using rigorous statistical tests we decide on the quality and variability of the earthquake mechanisms and with the use of stress tensor inversion and cumulative misfit analysis find, at the 95% confidence level or more, significantly different regions and periods of stress regime. We conclude that the region located near (105° W, 18.43° N) appears as a particularly diffuse zone affected by various stress styles and that the period following the great Mw 8.0 earthquake on 9 October 1995 appears as a short-lived change in stress induced by the great shock. An important difference in seismicity and stress between the southern and northern regions is highlighted by the regular occurrence of earthquakes south of the JB, in stark contrast with the scarcity of seismicity with Mw>4.9 north of 19.36° N, a region that is illuminated with microseismicity when local temporal or permanent deployments of seismographs are used, as noted by previous studies. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.