Feasibility Analysis of Short‐Period Seismograph Receiver Function—An Example of Hotan Seismic Array, Xinjiang

Abstract

AbstractUsing the teleseismic waveform data recorded by 9 sub‐stations (including 1 set of broadband and 9 sets of short‐period seismographs) of Hotan Seismic Array with an aperture about 3 km in 3 years, we studied and analysed the stability and reliability of short‐period seismograph receiver function. By comparative analysis of the receiver function waveforms isolated from teleseismic waveform data recorded by short‐period and broadband seismograph, the following results are obtained. (1) Receiver functions of short‐period and broadband seismograph are very consistent and high stability, they have good linear correlation (correlation coefficient 0.9), but Ps seismic phases have small amplitude difference (about 20%), whenever the Gaussian coefficient value is 1.5 or 2.5. (2) The short‐period seismograph receiver functions can replace broadband seismograph receiver functions, if a method using the seismic phase arrival time of receiver functions is adopted (such as grid‐stacking‐search method). (3) The result may cause wrong interpretation (e.g., the lower crust low‐velocity layer) if only the waveform data of short‐period seismograph receiver functions are used to inverse for crustal S‐wave velocity structure, because there exist large velocity deviations (about 0.3 km/s) from lower crust to upper mantle, due to lack of low frequency information under 0.155 Hz and the nonlinear amplitude response under 1 Hz frequency band with short‐period seismographs; so additional data sensitive to wave velocity value (such as surface wave dispersion) are needed for joint analysis.