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2011 Annual Report - Research Reports



  1. ElarmS Earthquake Early Warning
  2. ShakeAlert: A Unified EEW System for California (2011)
  3. Validation of Coda-derived Source Parameters using Strong and Weak Ground Motion Records of the 2008 Wells, Nevada Sequence
  4. Quantitative Analysis of Coda Window Length: How Much Length of Coda is Enough for Stable Amplitudes?
  5. Source Characterization of Mendocino Offshore Earthquakes for Improvements in Monitoring Active Deformation and Estimates of Earthquake Potential in the Mendocino Triple Junction Region
  6. Detecting the 2011 M9.0 Tohoku Earthquake with Moment Tensors
  7. Time-Lapse Monitoring for Detection of Transient Stress Changes in Geysers Geothermal Field
  8. Measuring Fault-Zone Rheology at Depth from Characteristically Repeating Earthquakes
  9. Free-Surface Vanishing Traction Effects on Shallow Sources
  10. Moment Tensors for Aftershocks of the M 7.9 Wenchuan Earthquake
  11. Focal Depth of the 2008 Panzhihua Earthquake from Depth Phase sPL and Joint Inversion of Local and Teleseismic Waveforms
  12. Deviatoric Moment Tensor Analysis at The Geysers Geothermal Field
  13. Slip Transients, Deficit and Release from Repeating Earthquakes
  14. Immediate Triggering of Small Repeating Earthquakes at Parkfield
  15. Joint Inversion of Seismic and Geodetic Data for the Source of the 4th March 2010 Mw 6.3 Jia-Shian, SW Taiwan, Earthquake
  16. Tidal Triggering of LFEs near Parkfield, CA (2011)
  17. Tremorscope: Imaging the the Deep Workings of the San Andreas Fault
  18. Search for Transient Deformation Following an Earthquake Sequence near San Juan Beutista
  19. Probing the Deep Rheology of Tibet: Constraints from 2008 Mw 7.9 Wenchuan, China Earthquake
  20. Joint Seismic and Geodetic Analysis of the 2009 Padang, Sumatra Intraslab Earthquake
  21. Rapid Detection of Large Earthquakes Using Quasi-Finite-Source Green's Functions in Moment Tensor Analysis
  22. Identifying Undetected Early Aftershocks Associated with the 12 August 1998 Mw 5.1 San Juan Bautista Earthquake
  23. Persistent Scatterer InSAR Analysis of Berkeley Hills Landslides
  24. Toward Global Waveform Tomography with the SEM: Improving Upper-Mantle Images at Shallow Depths
  25. On the Interpretation of SKS Splitting Measurements in the Presence of Several Layers of Anisotropy
  26. Anisotropic Stratification in the Continental Upper Mantle
  27. Refining the Cratonic Upper Mantle Using RegSEM
  28. Investigating Upper Mantle Discontinuities Beneath Subduction Zones
  29. Small-scale Variation of SS Precursors Observed by the US Transportable Array
  30. Investigation of Cascadia Segmentation with Ambient Noise Tomography (2011)
  31. Characterization of the Pacific Superplume Boundary
  32. An Automated Despiking Algorithm for Seismic Normal Mode Data
  33. Seismic Imaging of the San Andreas Fault in Northern California using Receiver Functions


From Research Section 6:
Rapid characterization of great subduction zone earthquakes, such as the 2011 M9.0 Tohoku-oki, Japan, event, is vital for quickly assessing the likelihood of tsunami generation. We have developed an approach, called GridMT, that continuously scans a grid of possible sources along the subduction zone surface. When energy arrives at the seismic stations it is used to estimate the location, size and mechanism of the earthquake. We applied it to the 2011 Tohoku-oki earthquake. This figure shows a map of virtual sources distributed along the slab. They are color-coded by the best variance reductions (VR) that are obtained from the continuous moment tensor analysis of long-period (100-200 sec) strong-motion data recorded at four K-NET stations (triangles). The best GridMT solution (Mw9.2 and VR=73.99%) is shown by the colored beach-ball and is compared to the USGS CMT solution (black) and to the JMA epicenter (star).