| 利用S波高频衰减参数对云南地区地壳Q值成像 |
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| 引用本文： | 周龙泉,刘杰,苏有锦,马宏生,周俊杰.利用S波高频衰减参数对云南地区地壳Q值成像[J].地球物理学报,2009,52(6):1500-1507. |
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| 作者姓名： | 周龙泉 刘杰 苏有锦 马宏生 周俊杰 |
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| 作者单位： | 1.中国地震台网中心，北京 100045;2.中国科学技术大学地球和空间科学学院，合肥 230026;3.云南省地震局，昆明 650224;4.中国地震局地震预测研究所，北京 100036;5.河北工程大学资源学院，邯郸 056038 |
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| 基金项目： | 国家科技支撑计划，地震科学联合基金 |
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| 摘 要： | 根据35个数字地震台站记录的云南地区1999 ~2007年6429个近震的波形资料，采用遗传算法对S波位移谱的高频衰减进行拟合，得到19009条衰减算子t*数据.根据这些衰减算子t*数据，反演得到云南地区地壳Q值分布.结果表明，云南地区的地壳Q值分布存在显著的横向不均匀性，即红河断裂北侧地壳Q值整体偏低，而红河断裂南侧地壳Q值整体较高.云南地区1900年以来6级以上强震基本上位于低Q值区域，这可能由于强烈构造活动导致地壳产生大量裂隙，且裂隙中充满流体，从而表现为低Q值；但呈北西向的龙陵—澜沧—耿马—孟连一带的强震却位于高Q值区，这可能与该地区正发育一条新的构造带有关.此外，云南地区的高大地热流点(>80 mW/m2)基本上位于低Q值区域，热流值与衰减值成负对应关系.
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| 关 键 词： | 云南地区 S波高频衰减 衰减算子t* Q值成像 |
| 收稿时间： | 2008-7-29 |
| 修稿时间： | 2009-4-29 |
Tomography for Q of Yunnan region from high-frequency attenuation of S wave |
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| ZHOU Long-Quan,LIU Jie,SU You-Jin,MA Hong-Sheng,ZHOU Jun-Jie.Tomography for Q of Yunnan region from high-frequency attenuation of S wave[J].Chinese Journal of Geophysics,2009,52(6):1500-1507. |
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| Authors: | ZHOU Long-Quan LIU Jie SU You-Jin MA Hong-Sheng ZHOU Jun-Jie |
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| Institution: | 1.China Earthquake Network Center, Beijing 100045, China;2.School of Earth and Space Sciences, University of Sciences and Technology of China, Hefei 230026, China;3.Earthquake Administrations of Yunnan Province, Kunming 650224, China;4.Institute of Earthquake Science, China Earthquake Administrations, Beijing 100036, China;5.College of Natural Resource, Hebei University of Engineering, Handan 056038, China |
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| Abstract: | Based on the waveform data of 6429 local earthquakes recorded on 35 stations of Yunnan during the period from 1999 to 2007, a data set of 19009 attenuation factor t* is obtained by fitting the high-frequency attenuation of S wave spectra with genetic algorithm. The spatial distribution of Q is determined by inverting the data of t* with seismic tomography. The results show that there is a significant lateral heterogeneity in Q distribution in Yunnan, namely, the Q on the north side of Red River fault is low and is high on the other side. The M≥6.0 earthquakes are basically located in low-Q region since 1900, which may be due to strong tectonic activity leading to a large number of fluid-filled pores. However, the strong earthquakes in NW-trending Longlin-Lancang-Gengma region are located in high-Q region, which may be explained by the development of a new fault in the region. High heat flow sites (> 80 mW/m2) in this region are located in low-Q areas, indicating a negative correlation. |
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| Keywords: | Yunnan region High-frequency attention of S wave Attenuation operation t* Q tomography |
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