Annual Meeting - SCEC.org

Poster Abstracts
We have observed higher marine terraces at La Mesa and Ellwood that do not correlate to sea level highstands, which we
interpret to be earthquake terraces. In order to have uplift of 2 m, the earthquake would have to have had a magnitude of 7.0+,
which is worrisome because several hundred thousand people live there today and urbanization is increasing. Additional
dating of Holocene and late Pleistocene terraces along the Gaviota Coast will improve assessment of the earthquake hazard of
the region.
SCIENTIFIC VISUALIZATION IN 4D FOR EARTHQUAKE RESEARCH (A-029)
L.H. Kellogg, T. Bernardin, M.I. Billen, E.S. Cowgill, A.J. Elliott, P.O. Gold, C.L. Harwood, O. Kreylos, M.E. Oskin, B.
Pellett, D.L. Turcotte, and M.B. Yikilmaz
Three major earthquakes over the past two years have provided the opportunity to study the rupture process in
unprecedented detail: the 2010 Haiti, 2010 El Mayor-Cucupah, and 2011 Tōhoku earthquake. Here we both demonstrate the
use of virtual-reality based data visualization and analysis in rapid scientific response and investigations of earthquake
processes and illustrate their potential use following future events. After the Haiti and El Mayor-Cucupah earthquakes, rapid
data collection efforts were deployed, and high resolution LIDAR made it possible to map the fault zones and detect changes.
To manage, assess, and interpret the large 3D and 4D datasets collected during and after these earthquakes, we used
interactive scientific visualization tools developed in the W. M. Keck Center for Active Visualization in Earth Sciences
(KeckCAVES). Software based on the Virtual Reality User Interface (VRUI) makes it possible to view, interact with, and select
data, and rapidly carry out geologic mapping tasks in a immersive VR environments ranging from a desktop computer to a
CAVE. The EarthViewer software allowed us to visualize foreshock and aftershock sequences from the Tōhoku earthquake
which reveal the structure of the rupture surface. LIDARViewer made it possible to rapidly process and interpret airborne and
tripod LIDAR data collected after the Haiti and El Mayor-Cucupah, while Crusta permitted virtual geologic mapping on the
resulting high-resolution topographic models.
DEPOSITIONAL CONSTRAINTS ON SLIP ALONG THE SAN ANDREAS FAULT WITHIN THE EASTERN SAN
GORGONIO PASS REGION, SOUTHERN CALIFORNIA (A-135)
K.J. Kendrick, J.C. Matti, S.A. Mahan, G.P. Landis, and D.P. Miggins
A nested alluvial complex within the Mission Creek (MC) drainage records fault-activity histories of the Mission Creek and
Mill Creek strands of the San Andreas Fault (SAF) in the San Gorgonio Pass (SGP) region. We have investigated six surface
remnants using geologic mapping, morphometric and stratigraphic analysis, geochronology of fills (IRSL) and surfaces (CRN),
and pedogenic analysis. The surfaces cap distinct alluvial fills having clasts that we associate with sources in the Mission
Creek drainage in the nearby San Bernardino Mtns. We have distinguished and correlated the disconnected surface remnants,
based on morphometric analysis, including their longitudinal profiles, surface texture and drainage density. The degree of
soil-profile development, when compared to other regional pedons that have been independently dated, constrains the timing
of tectonic evolution. Pedogenic properties useful for age appraisals include tiron-extractable pedogenic silica, soildevelopment
indices, increase in clay volume, and iron-oxide composition and content. Correlation to regional soil
chronosequences indicates that the oldest MC surfaces are significantly older than 500 ka, although this age range (>500 ka) is
particularly difficult to constrain with available geochronologic methods. IRSL dates of 106 and 95 Ka from (respectively) 5
and 4 m beneath the youngest pedon are consistent with age estimates based on soil-profile development. The oldest surfaces
in the alluvial complex occur on deposits formed prior to movement along the Mill Creek strand of the SAF, and have been
displaced approximately 8 km from their source across both the Mill Creek and Mission Creek fault strands in SGP. This is the
same as a total slip estimate for the Mill Creek strand elsewhere in SGP, and indicates that there has been no movement on the
Mission Creek strand since the emplacement of this deposit. The youngest deposits within this complex accumulated
following cessation of movement along both the Mission Creek and Mill Creek strands, and mark the time after which slip had
transferred onto the Banning and Garnet Hill strands. Summing total lateral slip accumulated on the fault strands in the
eastern San Gorgonio Pass region, including the Mission Creek (0 km), Mill Creek (8 km), Banning and Garnet Hill (2-3 km),
during the past approximately 500 ka results in a maximum long-term slip rate of 20 – 22 mm/yr. This agrees well some
models of tectonic evolution, but not others.
QUAKE CATCHER NETWORK (QCN) SEISMIC SENSOR DEPLOYMENT GAME (A-009)
D.L. Kilb, A. Yang, and D. Rohrlick
The Kinect technology allows for hands-free game play, greatly increasing the accessibility of gaming for those uncomfortable
using controllers. How it works is the Kinect camera transmits invisible near-infrared light and measures its “time of flight” to
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