image: This is a tectonic map of western Mexico showing the Colima rift and the Colima volcanic complex. Black triangles represent major volcanic centers in the area. Major structural lineaments mark the tectonic depressions of the Colima rift and Tepic-Zacoalco Rifts. G -- Guadalajara City; T -- Tepic; MAT -- Mesoamerican Trench; EPR -- East Pacific Rise; RFZ -- Rivera fracture zone. From Lopez-Loera, H., Urrutia-Fucugauchi, J., and Alva-Valdivia, L.M., 2010, Magnetic characteristics of fracture zones and constraints on the subsurface structure of the Colima Volcanic Complex, western Mexico: Geosphere, v. 6, p. 35–46, doi: 10.1130/GES00204.1. view more
Credit: Geological Society of America
Boulder, CO, USA - The February issue of Geosphere, The Geological Society of America's Web science journal, is now online. Articles examine climate change in Arrow Canyon, Nevada, USA; faulting, magnetic anomalies vis-a-vie Colima volcano, the most active volcano in Mexico; and the architecture of oceanic plateaus.
Representatives of the media may obtain complementary copies of Geosphere articles by contacting Christa Stratton at the address above. Please discuss articles of interest with the authors before publishing stories on their work, and please make reference to Geosphere in articles published. Contact Christa Stratton for additional information or assistance.
Review abstracts for these articles and also earlier issues of Geosphere at http://geosphere.gsapubs.org/.
Non-media requests for articles may be directed to GSA Sales and Service, gsaservice@geosociety.org.
Dynamic Carboniferous climate change, Arrow Canyon, Nevada
James W. Bishop et al., Geology Dept., University of California, Shields Avenue, Davis, California 95616, USA; Present address: Chevron Energy Technology Company, 6001
Bollinger Canyon Road, C-1217, San Ramon, California 94583, USA.
Abstract: http://geosphere.gsapubs.org/content/6/1/1.abstract
Magnetic characteristics of fracture zones and constraints on the subsurface structure of the Colima Volcanic Complex, western Mexico
Hector Lopez-Loera et al., Instituto Potosino de Investigación Científi ca y Tecnológica, Camino a la Presa San José 2055, Lomas 4ª Sección, 78216, San Luis Potosí, S.L.P., Mexico.
This paper presents a magnetic study of fault zones in the volcanic terrains of the Colima volcanic complex in southwestern Mexico. The study shows that faults are characterized by magnetic anomalies, and illustrates how geophysics can be used to improve geological interpretations in young volcanic terrains. Colima is the most active volcano in Mexico, with a summit dome and several eruption events in the past decades. The area around the volcano is densely populated, including the city of Colima, and the study has implications for hazard assessments.
Abstract: http://geosphere.gsapubs.org/content/6/1/35.abstract
The architecture of oceanic plateaus revealed by the volcanic stratigraphy of the accreted Wrangellia oceanic plateau
Andrew R. Greene et al, Department of Geology and Geophysics, University of Hawai'i at Mānoa, 1680 East-West Road, Honolulu, Hawai'i 96822, USA
Abstract: http://geosphere.gsapubs.org/content/6/1/47.abstract
Journal
Geosphere