Study of theQ-value in and around Minle Basin |
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| Authors: | Li-Xun Yao Xue-Jun Yu Jin Wang Zeng-Ping Wen |
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| Institution: | 1. Seismological institude of Lanzhou, State Seismological Bureau, 730000, Lanzhou, China
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| Abstract: | The digital seimograph network set up by China and France in Zhangye of China had been operated in 1988. The Zhangye network is situated in the middle segment of Hexi corridor and Qilina mountain, which was regarded as a monitoring earthquake area. Using the records of Zhangye digital network theQ-values in and around Minle basin have been measured. The results of this study showed that theQp-values range from 500 to 780, andQs-values range from 230 to 460. TheQ-values of inside of Minle basin are higher than that around the basin. The greater parts of moderate and strong earthquakes occurred along tectonic belts around the Minle basin. Moreover, TheQ-values increased with the depth of penctration of wave ray. The attenuation of S wave is stronger than P wave in shallow layer of crust. Some problems ofQ-value change versus time before and after Sunan eathquake (M s=5.7) have been also disscussed. These results can be applied to study and to monitor seismic danger of the Minle monitoring area. |
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