The Friends of the Pleistocene went on a fieldtrip few days ago to study the 4D Architecture of an Oblique Rift Margin in Baja California, NW Mexico. The tour focussed on the paleoseismology of the Borrega and Laguna Salada Faults, especially on the 1982 and 2010 surface ruptures, and took place fom 27 February to 2 March, 2014. You can download the detailed field guide and the road log here. The guide was edited by John Fletcher, Thomas Rockwell, Orlando Teran, Ana Paula Hernandez, Karl Mueller, Lewis Owen, Peter Gold, Austin Elliott, Sinan Akciz, Warren Sharp, Alejandro Gonzalez, and Ronald Spelz.
Some impressions from the 2010 Laguna Salada surface ruptures (M7.2), all images from 2012:
What an offset, up to 2 m vertically!
The fault trace is visible over dozens of kilometers.
A road side fence, offset by the 2012 magnitude 7.2 earthquake
The end of the faults, but surely not the end of the earthquakes there…
Many thanks to Tom Rockwell for sharing!
Reference:
John Fletcher, Thomas Rockwell, Orlando Teran, Ana Paula Hernandez, Karl Mueller, Lewis Owen, Peter Gold, Austin Elliott, Sinan Akciz, Warren Sharp, Alejandro Gonzalez, and Ronald Spelz (2014). Field guide 4D Architecture of an Oblique Rift Margin – Paleoseismology of the Borrega and Laguna Salada Faults. Friends of the Pleistocene field trip February 27-March 2, 2014.
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