Receiver Function HV Ratio: A New Single Station Seismic Measurement for Imaging Crustal Structure

Date: 4/26/2019

Time: 11:30 AM

Room: Vashon

We have developed a single station seimic measurement with localized sensitivity, which can be applied to image curstal structure of extraterrestrial bodies with a single seismic station.

As we know, receiver function (RF) is a single station seismic meaurement with lcoalized sensitivity, however it may fail to constrain the absolute shear wave velocity, thus joint inversion of RF and surface wave dispersion are usually suggested. The newly proposed Receiver function HV ratio (RFHV), which takes advantage of the amplitude ratio between the radial and vertical receiver functions, is able to constrain the shear-wave velocity, hence, make it possible to constrain the crustal structure with a single station. A joint inversion of RF 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 crustal structure obtained with this newly developed technique is consistent with previous study with RF and surface wave dispersion in major features, such as the crustal low velocity layer and low velocity feature of the basins in the SE Tibet.

This method can be applied to image curstal structure of extraterrestrial bodies with a single seismic station or Earth structure with sparse network or dense array. It can also be combined with other single station measurements such as Rayleigh wave ZH ratio to improve resolution of the structure beneath the seismic station.

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 etal., 2018. Receiver Function HV Ratio, a New Measurement for Reducing Non-uniqueness of Receiver Function Waveform Inversion. Geophys. J. Int. 212, 1475–1485

Presenting Author: Jiajun Chong

Authors