From 14-18 October 2013 a field training course will take place in Central Argentina. The course and a workshop are organized by the Sam-GeoQuat Group, the topic is: “From the Pampean Ranges to the North Pampa: Tectonic and climatic forcing on the Late Quaternary landscape evolution of Central Argentina”. Deadline for registration is 30 August, so hurry if you are interested. Download the 1st circular (pdf, <1 MB) here: 1-course-sam-geoquat2013 more

A new paper in Tectonophysics deals with the use of terrestrial LiDAR for identifying the slip vectors on fault planes. Thomas Wiatr, Klaus Reicherter, Ioannis Papanikolaou, Tomás Fernandez-Steeger and Jack Mason collected and processed data from Crete island (Greece), where they scanned the scarp of the Spili Fault. They imaged numerous kinematic (slip direction) indicators like slickensides with this relatively new technique. The t-LiDAR data were then compared to traditional compass measurements in order to get an idea about the derivation betwen old-school measurements and high-tech methods.  more

Quaternary shortening at the Andean orogenic front (31°-33°s), Argentina: Current issues and challenges

 Carlos Costa¹, Emilio Ahumada¹, Benjamin Brooks², Andrew Meigs³, Lewis Owen⁴, Thomas Rockwell⁵, Lindsay Schoenbohm⁶, Carlos Gardini¹, Héctor Cisneros¹, Fabricio Vázquez^{1, 7}

1. Universidad Nacional de San Luis, Argentina. costa@unsl.edu.ar
2. U.S. Geological Survey, USA
3. Oregon State University, USA
4. University of Cincinnati, USA
5. San Diego State University, USA
6. University of Toronto, Canada
7. CONICET

Outstanding exposures, new data, and novel hypotheses developed during the last decade have turned the frontal deformation zone of the Andes between 31°S and 33°S (Fig. 1) into one of the most promising areas worldwide for improving the understanding on mountain building processes and seismic hazards related to thrust tectonics.

Because the Andes are relatively narrow in these latitudes, the geodetic signal in the backarc is dominated by the subduction zone locking process at the Chile trench. Nonetheless the geodetic analysis provides some useful constraints on the location and rates of modern backarc shortening, though not necessarily on the vergence. It is currently understood that backarc shortening occurs at rates of ~4-5mm/yr over a zone that is ~30km wide (across-strike) (Brooks et al., 2003; Kendrick et al., 2006). In the north (31°- 32°10° S) this would imply that the west-vergent, Eastern Precordilleran structures are the most likely to be active, while south of 32°10° S the east-vergent structures in the Southern Precordillera belt are likely to be most active (Fig. 1).

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A course on Paleoseismology and Archeoseismology will be held at the Annual Meeting of the Union Geofisica Mexicana on 2 and 3 November 2013. The course will be coordinated by Víctor Hugo Garduño. Also, we would like to advertise three special sessions on paleoseismology, faults, and active tectonics at the same meeting:

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Following Evelyn’s call for geological/geographical/funny signs in the field, I post some nice ones that I came across during the last years. Check out the Accretionary Wedge #58 for more signs! more

Bergen University currently advertises a post-doc position in tectonics and surface processes, mainly involving modelling surface processes along active faults. It is a joint project with Patience Cowie, Rob Gawthorpe and Ritske Huismans. The deadline is 5th August. Find more information on Jobbnorge.no. more

Todays field work image is again by Elisa Kagan and shows a damaged stalagmite in the Soreq Cave near Jerusalem. Damaged stalagmites were used to reconstruct earthquake recurrence intervals. more

Elisa Kagan sent me this nice field photo of the day – a drill core containing mass-movement evidence from the Dead Sea:

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The latest issue of the Seismological Research Letters (SRL) does not only have a very stylish cover, but also includes some papers that will be of interest for the fans of old earthquakes and environmental earthquake effects (EEEs). In the Historical Seismologist section, Bilham et al describe the hunt for a lost fault – that is, one that was described by Oldham in the 19th Century, but never really located and almost forgotten. Nice! more