 EPOD - a service of USRA

The Earth Science Picture of the Day (EPOD) highlights the diverse processes
and phenomena which shape our planet and our lives. EPOD will collect and
archive photos, imagery, graphics, and artwork with short explanatory
captions and links exemplifying features within the Earth system. The
community is invited to contribute digital imagery, short captions and
relevant links.


 EPOD 20th - Hollister Offset

   September 09, 2020

    Capture

   We’re celebrating 20 years of Earth Science Picture of the Day during
   the month of September! Today’s photo features a popular EPOD from the
   past. Thanks to all of our followers (on the blog, Facebook, Instagram
   and Twitter) for supporting us. Thanks also to all of you who’ve
   submitted your photos. We’re most appreciative. This EPOD was
   originally published September 28, 2006.

   Provided and copyright by:  David Lynch
   Summary author:  David Lynch

   The boundary between the North American Plate and the Pacific Plate is
   a complex region of intertwining faults that follow the granddaddy of
   them all, the San Andreas Fault. One of the major splinters is the
   Calaveras Fault. It runs through Hollister, California and is most
   evident in the vicinity of Dunne Park. Unlike the San Andreas Fault,
   which is usually locked for many years until it shifts and causes an
   earthquake, the Calaveras Fault is creeping steadily along at about
   half an inch per year. As a result, roads and houses built on the fault
   are slowly being sheared and shifted and must be patched frequently.
   When it is not feasible to repair them, the damage accumulates year by
   year.

   In the vicinity of Dunne Park, the fault is obvious as offset curbs and
   sidewalks for many blocks north and south of the Park. A low scarp
   roughly two feet high runs through the barbecue area on the east side
   of the park. In this photograph, the built-up motion is revealed as a
   prominent 2 ft (.65 m) side step in the sidewalk where the fault
   crosses from right to left. This means that the last time they paved
   the sidewalk was about 50 years ago. Offsets in the curbs are much
   smaller, the result of more recent paving and straightening of the
   road. How would you like to be a real estate agent in Hollister? Photo
   taken in May of 2004.


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Geology Links

     *  Earthquakes
     *  Geologic Time
     *  Geomagnetism
     *  General Dictionary of Geology
     *  Mineral and Locality Database
     *  Mohs Scale of Mineral Hardness
     *  This Dynamic Earth
     *  USGS
     *  USGS Ask a Geologist
     *  USGS/NPS Geologic Glossary
     *  USGS Volcano Hazards Program

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   Earth Science Picture of the Day is a service of the  Universities
   Space Research Association.

https://epod.usra.edu
 
