This cache involves walking from GZ to Way Point #1 across the Hayward Fault, and then a stop at Way Point #2 on the other side of the Clark-Kerr campus to establish a compass bearing of the fault. GZ and Way Point #1 are on the north sidewalk of Dwight Way just north of the Clark-Kerr Campus of UC Berkeley. Way Point #2 is on the public pathway, Tanglewood Path on the south side of the Clark-Kerr Campus, although cannot get to Tanglewood Path directly from the Campus but must approach from Tanglewood or Stonewall Road.
To log this cache: As with all ECs you must send answers to the questions below to the cache owner. You may log you cache the same day you send the e-mail with the answers. Please include the name of the cache in the subject line. I'm an easy grader and honor all good faith efforts, I only delete logs if the required email isn't sent or I have a strong belief that you didn't actually visit the cache.
GZ and Way Point #1: When walk between GZ and Way Point #1 (less than a 1/2 block apart), you'll be walking across the Hayward Faults. At many locations where you cross the Hayward Fault you'll find simple curb offset, moved bricks, or some other very discrete linear feature. However, between GZ and Way Point #1 the Hayward Fault is composed of several subparallel* fractures, all accommodating some portion of the offset. Also, with these series of subparallel traces of the fault, small drop (pull-apart) or compression (resulting in a rise) features can be observed.
*In geology "sub" in front of a term meaning close to or almost. So, subparallel fractures are fractures that are close to but not quite parallel.
Question #1 through #3: As you walk from GZ to Way Point #1 you will travel across several traces of the Hayward Fault, each denoted by a specific curb off set. (#1) As you walk this route how many separate curb offsets did you observe? (#2) For each offset provide the amount of displacement (that is, how far in inches is each offset). (#3) Other than the lateral offset, was there any other deformation you observed (tilting, lifting, dropping, etc.)?
Way Point #2: At this way point the fault crosses at the top of the short stairs just uphill of the coordinates. "Sadly" the pathway has been repair, and the beautiful fault creep damage shown in fault tour guide from 2008 is no longer available. However, you can still see the damage in the drainage ditch next to the path. The damage in this area is created by a combination of movement of the fault and hillslope movement.
Question #4: Standing at the top of the stairs, astride the fault, set either GZ or Way Point #1 as your target. Use this to determine the compass bearing of the Hayward Fault between these two points. What is the compass bearing you got for the fault?
More about the Hayward Fault and this EC Series:
About the Hayward Fault Series: This EC is first (from south to north) of a larger series of ECs all focusing on features of the Hayward Fault [this series is currently under construction, but individual ECs are being released sequentially to allow the largest number of cachers an opportunity for a FTF]. There is a final cache in the series (TBD) that can only be logged once you visited all the others in the series. Also, if you're interested in logging the final it is recommended you check out final in advance since observations you've made at this cache and other caches in the series will be helpful/required to log the final. Each of the ECs in the series contains slightly different information regarding the fault, with some overlap. Please see the Geotour for more information on this series (To be established).
About the Hayward Fault in General: The Hayward Fault is a splay off a the Calaveras Fault in the vicinity of San Jose, and the Calaveras Fault originates off the San Andreas Fault at a bend in the vicinity of Hollister (Figure of faults in the Bay Area http://i41.servimg.com/u/f41/16/31/61/01/haywar10.jpg ). The Hayward Fault starts in the vicinity of east of San Jose and extends at the foot of the East Bay Hills until disappears under San Pablo Bay at Point Pinole. The Hayward Fault is what is referred to as a right lateral strike-slip fault; this means that if standing on one side of the fault facing the other side of the fault, the opposite moves laterally (horizontally) to the right of the side your standing on.
References:
Stoffer, Phillip. 2008. "Where's the Hayward Fault? A Green Guide to the Fault." U.S. Geological Survey. Open File Report 2008-1135.
http://earthquake.usgs.gov/regional/nca/ucerf/images/2008probabilities-lrg.jpg