Estimating seismic moments and Lg Q using Lg spectra |
| |
Authors: | Jin Ping Xiao Wei-guo and Duan Ke-min |
| |
Institution: | (1) Northwest Institute of Nuclear Technology, 710613 Xi’an, China |
| |
Abstract: | A multi-event and multi-station inverse method is presented in the paper to simultaneously estimate the seismic moments (M
0) and source corner frequencies (f
c) of several Jiashi (Xinjiang, China) earthquakes, as well as the apparent Lg Q models for the paths from Jiashi to eight seismic stations (WMQ, AAK, TLG, MAKZ, KUR, VOS, ZRN and CHK) in Central Asia.
The resultant seismic moments correlate well with the M
0 values obtained by Harvard University using the centroid moment tensor (CMT) inversion and the surface-wave magnitudes as
well. After the correction by a typical value of average radiation coefficient for regional SV waves, the M
0 values from Lg spectral inversion are still close to the corresponding values obtained from CMT inversion. The obtained apparent
Q
0Lg values (Lg Q at 1 Hz) are consistent with the tectonic features of corresponding propagation paths. The Q
0Lg values are 351±87, 349±86 and 300±27 for the paths from Jiashi to AAK, TLG and MAKZ, respectively. They are smaller than
Q
0Lg values for the paths to KUR, VOS, ZRN and CHK, which are 553±72, 569±58, 550±57 and 603±65, respectively. These results agree
with the condition that the paths to AAK, TLG and MAKZ mainly propagate through the mountainous Tianshan area where relatively
strong seismic activities and large variations of topography are exhibited, while the paths to KUR, VOS, ZRN and CHK mainly
propagate through the stable area of Kazak platform. The Q
0Lg value for the path to WMQ is 462±56. This is also in agreement with the condition that the path to WMQ is basically along
the border area between Tianshan Mountain and Tarim Basin, and along this path the variations of topography and crustal thickness
are moderate in comparison with that along the path to MAKZ.
Foundation item: Foundation of Verification Researches for Army Control Technology (413290102). |
| |
Keywords: | spectral inversion seismic moment Lg Q Jiashi earthquakes |
本文献已被 SpringerLink 等数据库收录! |
|