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Figure 54. CLM splitting from mantle lithosphere compared
with observations showing splitting signal arises from deeper
than 100 km.
Salton Seismic Imaging Project
The LAD group participated in both the active and passive parts of the
Salton Seismic Imaging Project (SSIP) (Figure 57). Fuis et al (2011 AGU
abstract) describes the project: Seismic data were acquired from 2 to 18
March 2011. One hundred and twenty-six borehole explosions (10-1400 kg
yield) were detonated along seven profiles in the Salton Trough region,
extending from area of Palm Springs, California, to the southwestern tip of
Arizona. Airguns (1500 and 3500 cc) were fired along two profiles in the
Salton Sea and at points in a 2-D array in the southern Salton Sea.
Approximately 2800 seismometers were deployed at over 4200 locations
throughout the Salton Trough region, and 48 ocean-bottom seismometers
were deployed at 78 locations beneath the Salton Sea. Many of the onshore
explosions were energetic enough to be recorded and located by the
Southern California Seismograph Network. A line of passive broadband stations will run for a year.
References
Alvizuri, C., and T. Tanimoto, (2011), Azimuthal
anisotropy from array analysis of Rayleigh
waves in Southern California, Geophys. J. Int.
(2011) 186, 1135–1151.
Clayton, R., (2011), Adding the Moho and
Anisotropy to the SCEC Community Velocity
Model via the CLM, SCEC Annual Report 2010.
Davis, P.M. and Y. Zeng, (2011), The dependence of
coda on anisotropic scattering and intrinsic
attenuation, SCEC 2010 Annual Report.
Helffrich, G., Thompson (2010), D. A stacking
approach to estimate Vp/Vs from receiver
functions. Geophys. J. Int., v. 181, 899-902.
SCEC Research Accomplishments | Report
Figure 55. CLM splitting from mantle asthenosphere Z>100
km compared with observations.
Figure 56. Plunge of anisotroic slow axes in
lower crust from receiver function anisotropy
(Zandt 2011).
Figure 57. Salton Seismic Imaging Project SSIP March 2011.
2011 SCEC Annual Meeting | 77