Shallow Crustal Shear Velocity and Vp/Vs Across Southern California: Joint Inversion of Short‐Period Rayleigh Wave Ellipticity, Phase Velocity, and Teleseismic Receiver Functions

Details

• Journal Title:
  Geophysical Research Letters
• Personal Author:
  Berg, Elizabeth M. ; Lin, Fan‐Chi ; Schulte‐Pelkum, Vera ; Allam, Amir ; Qiu, Hongrui ; Gkogkas, Konstantinos
• NOAA Program & Office:
  CIRES (Cooperative Institute for Research in Environmental Sciences)
• Description:
  Near-surface seismic velocity structure plays a critical role in ground motion amplification during large earthquakes. In particular, the local Vp/Vs ratio strongly influences the amplitude of Rayleigh waves. Previous studies have separately imaged 3D seismic velocity and Vp/Vs ratio at seismogenic depth, but lack regional coverage and/or fail to constrain the shallowest structure. Here, we combine three datasets with complementary sensitivity in a Bayesian joint inversion for shallow crustal shear velocity and near-surface Vp/Vs ratio across Southern California. Receiver functions–including with an apparent delayed initial peak in sedimentary basins, and long considered a nuisance in receiver function imaging
• Keywords:
  General Earth And Planetary Sciences Geophysics General Earth And Planetary Sciences General Earth And Planetary Sciences
• Source:
  Geophysical Research Letters, 48(15)
• DOI:
  https://doi.org/10.1029/2021gl092626
• ISSN:
  0094-8276 ; 1944-8007
• Format:
  PDF
• Publisher:
  American Geophysical Union (AGU)
• Document Type:
  Journal Article
• Rights Information:
  Other
• Compliance:
  Library
• Main Document Checksum:
  urn:sha256:41c65c1509929c2c7c9edbde79ef710c1144c6f3cd11e2f178ca29031984dc25
• Download URL:
  https://repository.library.noaa.gov/view/noaa/52607/noaa_52607_DS1.pdf
• File Type:
  [PDF - 3.48 MB ]