Receiver Function HV Ratio: A New Seismic Measurement to Imaging Crustal Structure
Abstract
A new seismic measurement, receiver function HV ratio, has been proposed and applied to imaging the crustal structure beneath a linear array in South-East Tibet. The 2D crustal structure obtained with this newly developed technique is consistent with previous study in major features. As we know, receiver function (RF) waveform may fail to constrain the absolute shear wave velocity, and joint inversion of RF and surface wave dispersion has been employed to overcome this disadvantage. The newly proposed technique, Receiver function HV ratio (RFHV), which takes advantage of the amplitude ratio information between the radial and vertical receiver functions, is able to constrain the shear-wave velocity, hence, improve the horizontal resolution of imaging. Numerical analysis indicates that RFHV is sensitive to the average shear wave velocity in the depth range it samples. A joint inversion of RF waveform and RFHV has been developed, and both synthetic tests and real data application proved the feasibility of the joint inversion. The method has been applied to a linear array which is a part of the dense seismic array of ChinArray program in SE Tibet during the time period from August 2011 to August 2012 in SE Tibet (ChinArray-Himalaya, 2011).
The measurements of RFHV reveals the variation of the tectonics along the linear array. And main features of the velocity structure imagined by the joint inversion of RFHV and RF waveform are consistent with previous study by joint inversion of surface wave dispersion and RF waveform, such as the crustal low velocity layer and low velocity feature of the basins in the SE Tibet. This method can be applied to regions with sparse network or dense array, it also can be combined with other seismic measurements to improve the horizontal resolution of seismic imaging. KEYWORDS:crustal structure, receiver function HV ratio, joint inversion Reference ChinArray-Himalaya. 2011. China Seismic Array waveform data of Himalaya Project. Institute of Geophysics, China Earthquake Administration. doi:10.12001/ChinArray.Data. Himalaya. Jiajun Chong, Risheng Chu, Sidao Ni, Qingjun Meng, Aizhi Guo, 2018. Receiver Function HV Ratio, a New Measurement for Reducing Non-uniqueness of Receiver Function Waveform Inversion. Geophys. J. Int. 212, 1475-1485- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.S13D0479C
- Keywords:
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- 7299 General or miscellaneous;
- SEISMOLOGY