Teaching about New Madrid earthquakes: science and hazard Illinois Earthscope Teachers’ Workshop
Sierra Nevada EarthScope Project Results - Geological Society of Washington Meeting 11/13/13
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Transcript of Sierra Nevada EarthScope Project Results - Geological Society of Washington Meeting 11/13/13
![Page 1: Sierra Nevada EarthScope Project Results - Geological Society of Washington Meeting 11/13/13](https://reader033.fdocuments.us/reader033/viewer/2022060123/559791581a28ab52798b45a1/html5/thumbnails/1.jpg)
The Unusual The Unusual Lithosphere Beneath Lithosphere Beneath
the Sierra Nevadathe Sierra NevadaResults from Results from
the First Major the First Major EarthScope EarthScope
Seismic Seismic DeploymentDeployment
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“Simple” Mountains
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“Complicated” Mountains
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The (Western) Sierra Nevada
~100 meters
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The (Eastern) Sierra Nevada
~3 km
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A Complex Geologic Story
Modern data,new ideas
Few recent geophysical constraints
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Time Dependent Mantle
After Ducea, 1998 & 2002
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Zandt et al., 2004
Lithospheric Foundering
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Seismic Fieldwork
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Example Event
P
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Receiver Functions
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Iterdecon Method
Ligorría & Ammon, 1999
1: u(t)z u(t)r g(t)r
Progressively finds time lag for largest difference between two signals.
2: u(t)r – (g(t)r ∗ u(t)z) u(t)r
Repeat 1 until the misfit of 2 is very small.
MATHMATH
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Example Receiver Functions
P
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CCP Stacking
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Southern Sierra
N
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Central Sierra
N
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Central Sierra
N
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Northern Sierra
N
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Western SierraN
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Eastern Sierra FlankN
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IncreasesE to W
Deepest under westernSierra
Moho Depth
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SNEP Tomography
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SNEP Tomography
Jones et al., In Review
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A Live View
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A Live View
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Overall Interpretation
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George Zandt, Hersh Gilbert, Tom Owens, Craig Jones, Susan Beck, Jon Patchett, Mihai Ducea, Clem Chase, Rick Bennett, Josh Calkins, Ian Bastow, Ken Dueker, Matt Fouch, Philip Crotwell, Megan Anderson, Lara Wagner, Arda Ozacar, Berk Biryol, Christine Gans, Lepolt Linkimer, Ryan Porter, Koichi Sakaguchi, Aaron Wech, Steve Hansen, Josh Stachnik, John Jasbinsek, Chris Harig, Owen Hurd, Nickles Badger, Will Huff, Serkan Arca, Soledad Velasco
“The Frassettos”: Ron, Gale, Kendra
My friends in Tucson and elsewhere: Anna, Keeler, Tibs, Toby especially
Our National Science Foundation, in awards of different forms and amounts to me and others
And …Megan (of Fogarty.m)
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EarthScope-USArray
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EarthScope-USArray
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Iterdecon Method
Ligorría & Ammon, 1999
1: u(t)z u(t)r g(t)r
Progressively finds time lag for largest difference between two signals.
2: u(t)r – (g(t)r ∗ u(t)z) u(t)r
Repeat 1 until the misfit of 2 is very small.
![Page 37: Sierra Nevada EarthScope Project Results - Geological Society of Washington Meeting 11/13/13](https://reader033.fdocuments.us/reader033/viewer/2022060123/559791581a28ab52798b45a1/html5/thumbnails/37.jpg)
Southern Sierra
N
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Central Sierra
N
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Northern Sierra
N
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FoothillsN
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Eastern SierraN
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Basin and RangeN
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Regional and local trends
Multiple proxies
Crustal Vp/Vs
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DecreasesE to W
Correlates with crustal thickness
Moho Amplitu
de
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Interface Resolution
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Moho Sensitivity
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Forward Modeling
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SNEP Local Earthquakes
>30
20-30
depth (km)10-20
<10
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Recent Sierra Uplift - GPS
Hammond et al., 2012
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