September 2, 1999

USGS Fault Rupture from Izmit Earthquake, Set 2

Here are 9 new photographs of fault rupture taken by the earthquake geologists in our field team.

0.9 m high scarp with lateral offset of 1.9 m. Local changes in fault geometry are believed to have caused the vertical component across fault.
This barn is faulted through the middle; the moletrack is seen in the foreground with the viewer standing on the fault. From the air one can see metal roof panels of the barn that rotated as the barn was faulted.
Topographic humps offset by the fault reveal stratigraphy. Bridge in background was knocked down during earthquake.
A dike is offset 2.3 m.
A close-up shot of a tree that was actually split into two by faulting. The tree records 0.8 m of offset, a larger view reveals that across the entire fault zone, offset is 3 m.
The offset stream bank of the Sakarya River. The tree lines record an offset of 3.3 m.
The fault trends through a highway overpass (which did not fail), causing the guardrail to be offset ~2.8 m.
Moletrack showing well-expressed extensional and compressional components of the rupture.
The fault is clearly expressed through this pasture at N40 41.959', E030 30.196'. Offset of a small road is 2.4 m (a maximum).