ML amplitude tomography in north China
ML amplitude tomography in north China
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DOI：
10.1785/0120060021
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发表时间：
2006-08-01
影响因子：
3
通讯作者：
Sun, Youshun
中科院分区：
文献类型：
--
作者：
Pei, Shunping;Zhao, Junmeng;Sun, Youshun
我们从《中国地震年报》（Annual Bulletin of ChineseEarthquakes，ABCE）报道的91个台站的1732个地震记录中选取了10，899个M-L振幅读数，并利用层析成像技术估计了中国北方地壳内品质因子Q（0）（1 Hz处的Q）的横向变化。估计的Q（0）值从H 5到715不等，平均值为415。Q（0）值与中国东部的构造和地形结构相一致。Q（0）在山西、银川地堑、渤海湾、郯庐断裂带等断裂活动区较低，而在稳定的鄂尔多斯盆地较高。Q（0）值在华北、太康-合肥、江汉、苏北-黄海和松辽盆地等地形低洼地区较低，而在阴山、燕山、太行、秦岭、大别山、武夷山和鲁西、胶辽隆起等山地和隆起区则较高。质量因子估计也与Pn和Sn速度模式一致。通常，高速度值对应于高Q（0），低速度值对应于低Q（0）。这与地壳和上地幔的共同温度影响是一致的。
We have selected 10,899 M-L amplitude readings from 1732 events recorded by 91 stations, as reported in the Annual Bulletin of Chinese Earthquakes (ABCE), and have used tomographic imaging to estimate the lateral variations of the quality factor Q(0) (Q at 1 Hz) within the crust of Northern China. Estimated Q(0) values vary from H 5 to 715 with an average of 415. Q(0) values are consistent with tectonic and topographic structure in Eastern China. Q(0) is low in the active tectonic regions having many faults, such as the Shanxi and Yinchuan Grabens, Bohai Bay, and Tanlu Fault Zone, and is high in the stable Ordos Craton. Q(0) values are low in several topographically low-lying areas, such as the North China, Taikang-Hefei, Jianghan, Subei-Yellow Sea, and Songliao basins, whereas it is high in mountainous and uplift regions exhibiting surface expressions of crystalline basement rocks: the Yinshan, Yanshan, Taihang, Qinlin, Dable and Wuyi Mountains, and Luxi and Jiaoliao Uplifts. Quality-factor estimates are also consistent with Pn- and Sn-velocity patterns. Highvelocity values, in general, correspond with high Q(0) and low-velocity values with low Q(0). This is consistent with a common temperature influence in the crust and uppermost mantle.