Attenuation of regional seismic phases (Lg and Sn) in Eastern Mongolia
Attenuation of regional seismic phases (Lg and Sn) in Eastern Mongolia
复制标题
蒙古东部区域震相（Lg和Sn）的衰减
DOI：
10.1093/gji/ggx349
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发表时间：
2017-11
影响因子：
2.8
通讯作者：
Demberel Sodnomsambuu
中科院分区：
文献类型：
--
作者：
He Jing;S;vol Eric;Wu Qingju;Gao Mengtan;Gallegos Andrea;Ulziibat Munkhuu;Demberel Sodnomsambuu
我们利用69个宽带地震台站记录的228次当地地震的数据，提出了蒙古东部Lg和Sn衰减的频率相关层析模型。我们分别采用双站法（TSM）和反向双站法（RTM）测量频率相关的Sn和lgq值。RTM的优点是允许我们进行独立于现场效应、仪器响应和源参数的衰减测量。为了了解蒙古东部及周边地区地壳衰减的空间变化，我们对lgqandη进行了层析成像。中戈壁火山岩区存在高Lg衰减和低η，而南戈壁构造活动区及其周围存在高Lg衰减和高η。我们还通过绘制Sn衰减和η值的变化来研究上地幔衰减。高锡衰减区主要分布在戈壁中部的山地和火山活动区。我们的Lg和Sn衰减模型与速度的横向变化以及构成蒙古东部的主要构造单元有很好的相关性。高衰减区似乎与低速、第四纪火山和新生代构造活动有关。
We present tomographic models of frequency-dependent Lg and Sn attenuation in eastern Mongolia using data from 228 local earthquakes that were recorded by 69 broad-band seismic stations. We adopt the two-station method (TSM) and reverse two-station method (RTM) to measure the frequency-dependent Sn and LgQvalues, respectively. The RTM has the advantage of allowing us to make attenuation measurements that are independent of site effects, instrument responses and source parameters. We have tomographically mapped LgQandηin order to understand spatial variations in crustal attenuation across eastern Mongolia and the surrounding regions. High Lg attenuation and lowηare found in the volcanic region of the Middle Gobi Desert, while high Lg attenuation and highηare found in and around the tectonically active regions of the South Gobi Desert. We have also examined uppermost mantle attenuation by mapping the variation in Sn attenuation andηvalues. Regions of high Sn attenuation are found in the mountainous and volcanically active regions of the Middle Gobi Desert. Our Lg and Sn attenuation models correlate well with lateral variations in velocity as well as with the major tectonic units that make up eastern Mongolia. High attenuation regions seem to be associated with low velocities, Quaternary volcanoes and Cenozoic tectonic activity.
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影响因子：
3
作者：
K. Chun;G. West;R. Kokoski;C. Samson
通讯作者：
K. Chun;G. West;R. Kokoski;C. Samson
影响因子：
2.8
作者：
T. Furumura;B. Kennett
通讯作者：
T. Furumura;B. Kennett
影响因子：
2.3
作者：
W. Kampfmann;H. Berckhemer
通讯作者：
W. Kampfmann;H. Berckhemer
影响因子：
2
作者：
B. Mitchell;S. Baqer;A. Akinci;L. Cong
通讯作者：
B. Mitchell;S. Baqer;A. Akinci;L. Cong
影响因子：
25.2
作者：
L. Knopoff
通讯作者：
L. Knopoff