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Resolving Shallow Shear-Wave Velocity Structure beneath Station CBN by Waveform Modeling of the Mw 5.8 Mineral, Virginia, Earthquake Sequence

2014; Seismological Society of America; Volume: 104; Issue: 2 Linguagem: Inglês

10.1785/0120130190

1943-3573

Zhiwei Li, Sidao Ni, Paul Somerville,

earthquake and tectonic studies

Research Article| February 25, 2014 Resolving Shallow Shear‐Wave Velocity Structure beneath Station CBN by Waveform Modeling of the Mw 5.8 Mineral, Virginia, Earthquake Sequence Zhiwei Li; Zhiwei Li aState Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, Chinasdni@whigg.ac.cn Search for other works by this author on: GSW Google Scholar Sidao Ni; Sidao Ni aState Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, Chinasdni@whigg.ac.cn Search for other works by this author on: GSW Google Scholar Paul Somerville Paul Somerville bURS Corporation, Los Angeles, California 90017 Search for other works by this author on: GSW Google Scholar Bulletin of the Seismological Society of America (2014) 104 (2): 944–952. https://doi.org/10.1785/0120130190 Article history first online: 14 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Zhiwei Li, Sidao Ni, Paul Somerville; Resolving Shallow Shear‐Wave Velocity Structure beneath Station CBN by Waveform Modeling of the Mw 5.8 Mineral, Virginia, Earthquake Sequence. Bulletin of the Seismological Society of America 2014;; 104 (2): 944–952. doi: https://doi.org/10.1785/0120130190 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin of the Seismological Society of America Search Advanced Search Abstract The 23 August 2011 Mw 5.8 Mineral, Virginia, earthquake was the largest earthquake in the central and eastern United States in the past 100 years, and it was well recorded by strong motion and broadband seismometers, thus providing abundant ground‐motion data for earthquake ground‐motion studies. The largest recorded ground motion among Advanced National Seismic System stations was at station CBN, but the site effects at station CBN need to be understood because the strong motions recorded there do not represent bedrock site conditions. On the radial component of these recordings, the initial P wave is very weak, and is followed by a strong signal 0.3 s later, which is interpreted to be the S wave converted from the P wave (PS) at the interface between the sediments and bedrock. We first estimate the subsurface shear‐wave velocity by modeling the ratio of the radial to vertical components of the initial P waves, and then resolve the velocity structure and thickness of the unconsolidated sediments by modeling the PS wave. The subsurface shear‐wave velocity is found to be approximately 300 m/s, consistent with field survey results. The shear‐wave velocity at the bottom of the sediments is constrained to be in the range of 320∼780 m/s, from which the thickness of the layer is estimated to be 100∼230 m. The estimates of shear‐wave velocity structure and thickness of the sediments are further improved by modeling the oscillatory waveforms between the P and S waves. This study suggests that site characterization for the estimation of ground‐motion amplification at a site can be achieved inexpensively and noninvasively by modeling local P waveforms recorded at the site. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.