Imposing Active Sources during High-Frequency Passive Surface-Wave Measurement

Abstract Passive surface-wave utilization has been intensively studied as a means of compensating for the shortage of low-frequency information in active surface-wave measurement. In general, passive surface-wave methods cannot provide phase velocities up to several tens of hertz; thus, active surface-wave methods are often required in order to increase the frequency range. To reduce the amount of field work, we propose a strategy for a high-frequency passive surface-wave survey that imposes active sources during continuous passive surface-wave observation; we call our strategy “mixed-source surface-wave (MSW) measurement.” Short-duration (within 10 min) passive surface waves and mixed-source surface waves were recorded at three sites with different noise levels: namely, inside a school, along a road, and along a railway. Spectral analysis indicates that the high-frequency energy is improved by imposing active sources during continuous passive surface-wave observation. The spatial autocorrelation (SPAC) method and the multichannel analysis of passive surface waves (MAPS) method based on cross-correlations were performed on the recorded time sequences. The results demonstrate the flexibility and applicability of the proposed method for high-frequency phase velocity analysis. We suggest that it will be constructive to perform MSW measurement in a seismic investigation, rather than exclusively performing either active surface-wave measurement or passive surface-wave measurement.

[1]  John N. Louie,et al.  Faster, Better: Shear-Wave Velocity to 100 Meters Depth From Refraction Microtremor Arrays , 2001 .

[2]  M. Ohori,et al.  A Comparison of ESAC and FK Methods of Estimating Phase Velocity Using Arbitrarily Shaped Microtremor Arrays , 2002 .

[3]  Koichi Hayashi,et al.  CMP cross-correlation analysis of multi-channel surface-wave data , 2004 .

[4]  William R. Stephenson,et al.  Subsoil Structure Using spac Measurements along a Line , 2006 .

[5]  G. Rix,et al.  Near-Field Effects on Array-Based Surface Wave Methods with Active Sources , 2009 .

[6]  Keiiti Aki,et al.  A NOTE ON THE USE OF MICROSEISMS IN DETERMINING THE SHALLOW STRUCTURES OF THE EARTH’S CRUST , 1965 .

[7]  Jianghai Xia,et al.  Estimation of near‐surface shear‐wave velocity by inversion of Rayleigh waves , 1999 .

[8]  Francisco Luzón,et al.  On the correlation of seismic microtremors , 2005 .

[9]  Jianghai Xia,et al.  A new passive seismic method based on seismic interferometry and multichannel analysis of surface waves , 2015 .

[10]  Sungsoo Yoon.  Combined active-passive surface wave measurements at five sites in the Western and Southern US , 2011 .

[11]  Julian Ivanov,et al.  Imaging Dispersion Curves of Passive Surface Waves , 2004 .

[12]  Effects of the durations of crosscorrelated microtremor records on broadband dispersion measurements using seismic interferometry , 2014 .

[13]  Jianghai Xia,et al.  Combined Use of Active and Passive Surface Waves , 2005 .

[14]  Chih-Ping Lin,et al.  Effect of lateral heterogeneity on surface wave testing: Numerical simulations and a countermeasure , 2007 .

[15]  Jianghai Xia,et al.  Advantages of calculating shear-wave velocity from surface waves with higher modes , 2000 .

[16]  Michael Asten,et al.  On bias and noise in passive seismic data from finite circular array data processed using SPAC methods , 2006 .

[17]  Yinhe Luo,et al.  Rayleigh-Wave Dispersive Energy Imaging Using a High-Resolution Linear Radon Transform , 2008 .

[18]  Y. Liu,et al.  Combining Active- and Passive-Source Measurements to Profile Shear Wave Velocities for Seismic Microzonation , 2005 .

[19]  Jianghai Xia,et al.  Verification of correctness of using real part of complex root as Rayleigh-wave phase velocity with synthetic data , 2013 .

[20]  H. Okada.  The Microtremor Survey Method , 2003 .

[21]  John P. Castagna,et al.  Sensitivity of Near-Surface Shear-Wave Velocity Determination From Rayleigh And Love Waves , 1989 .

[22]  J. Xia,et al.  Simple equations guide high-frequency surface-wave investigation techniques , 2006 .

[23]  J. Xia,et al.  Surface-wave observations after integrating active and passive source data , 2013 .

[24]  Richard D. Miller,et al.  Multichannel analysis of surface waves , 1999 .

[25]  Jianghai Xia,et al.  Inversion of high frequency surface waves with fundamental and higher modes , 2003 .

[26]  G. Rix,et al.  Combined Active-Passive Surface Wave Measurements For Near-Surface Site Characterization , 2004 .

[27]  Feng Cheng,et al.  Multichannel analysis of passive surface waves based on crosscorrelations , 2016 .

[28]  Keiiti Aki,et al.  Space and Time Spectra of Stationary Stochastic Waves, with Special Reference to Microtremors , 1957 .

[29]  Koichi Hayashi.  Comparison of dispersion curves and velocity models obtained by active and passive surface wave methods , 2016 .

[30]  Lapo Boschi,et al.  Seismic attenuation from recordings of ambient noise , 2013 .