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| Attenuation of S wave in the crust of Ordos massif | |
| 作者姓名： | 刘红桂 啜永清 陈书清 金春华 |
| 作者单位： | Earthquake Administration of Jiangsu Province Nanjing 210014，China，Earthquake Administration of Shanxi Province Taiyuan 030002，China，Earthquake Administration of Jiangsu Province Nanjing 210014，China，Earthquake Administration of Ningxia Hui Autonomous Region Yinchuan 750001，China |
| 基金项目： | National Scientific Research Target Project of China (2004BA601B01-04-03) during the tenth Five-year Plan, Joint Seismological Science Foundation of China (104047) and the Application Lab of Digital Seismic Wave Data in Center for Analysis and Prediction. |
| 摘 要： | Introduction Located between Qingzang (Qinghai-Xizang) Plateau that highly uplifts due to compression and North China plain that badly subsides due to crustal extension, the Ordos massif has both the basic attributes of stretching tectonic region of North China marginal basin and the features of marginal shear-compression zone of Qingzang Plateau. It has a length of about 600 km in the N-S direction and a width of about 400 km in the W-E direction. Its geological structure is very simple… |
| 收稿时间： | 20 September 2004 |
| 修稿时间： | 31 May 2005 |
Attenuation of S wave in the crust of Ordos massif |
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| LIU Hong-gui,CHUO Yong-qing,CHEN Shu-qing,JIN Chun-hua.Attenuation of S wave in the crust of Ordos massif[J].Acta Seismologica Sinica(English Edition),2005,18(5):521-531. | |
| Authors: | LIU Hong-gui CHUO Yong-qing CHEN Shu-qing JIN Chun-hua |
| Institution: | 1. Earthquake Administration of Jiangsu Province, Nanjing 210014, China 2. Earthquake Administration of Shanxi Province, Taiyuan 030002, China 3. Earthquake Administration of Ningxia Hui Autonomous Region, Yinchuan 750001, China |
| Abstract: | We presented attenuation characteristics of S waves in the crust of Ordos massif. Using 487 pieces of digital oscil- lograms of 19 seismic events recorded by 32 seismologic stations located on Ordos massif and its surroundings, we have calculated the parameter of three-segment geometric attenuation and give the relation of inelastic attenuation Q value with frequency in the crust of Ordos massif, site responses of 32 stations, and source parameters of 19 events by the genetic algorithm. The results indicate that Q value (at 1 Hz) of S-wave in the crust of Ordos massif is much larger than that in the geologically active tectonic region. The site responses of the 32 stations in the high-frequency section do not show clear amplification effect except one or two stations, while in the low-frequency section, there is difference among the stations. The logarithmic value of seismic moment and the magnitude ML of 19 seismic events has a very good linear relationship. |
| Keywords: | Ordos massif geometric attenuation inelastic attenuation genetic algorithm |
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