Estimation of horizontal-to-vertical spectral ratios (ellipticity) of Rayleigh waves from multistation active-seismic records Binbin Mi, Yue Hu, Jianghai Xia, Laura Valentina Socco (2019) Estimation of horizontal-to-vertical spectral ratios (ellipticity) of Rayleigh waves from multistation active-seismic records, In: GEOPHYSICS, pp. EN81-EN92, ISSN: 0016-8033