P-wave tomography and relation between shallow and deep structures beneath the Songliao basin

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• 作者：Qiyan Yang ; Qingju Wu ; Xiaojun Ma ; Fengxue Zhang ; Yanrui Sheng
• 关键词：Tomography ; Northeast China ; Ray ; Relation between shallow ; deep structures
• 刊名：Earthquake Science
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：28
• 期：4
• 页码：253-261
• 全文大小：3,868 KB
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• 作者单位：Qiyan Yang (1) (2)
  Qingju Wu (2)
  Xiaojun Ma (2) (3)
  Fengxue Zhang (2)
  Yanrui Sheng (1)
  
  1. Earthquake Administration of Hebei Province, Shijiazhuang, 050021, China
  2. Institute of Geophysics, China Earthquake Administration, Beijing, 100081, China
  3. Earthquake Administration of Ningxia Autonomous Region, Yinchuan, 751000, China
  
• 刊物主题：Geophysics/Geodesy;
• 出版者：Springer Berlin Heidelberg
• ISSN：1867-8777

文摘

We selected relative travel-time residuals from teleseismic waveform data using the waveform correction method and imaged the P wave velocity structure beneath Northeast China. In combination with other geophysical data, we discussed the relation between the shallow and deep structures of the area. The results show that there is a primary high-velocity zone with some high- and low-velocity distribution characters beneath the Songliao basin. The low-velocity anomalies may extend down to the upper mantle, and may be the result of material upwelling. The low-velocity anomaly beneath the southern part of the Songliao basin is connected to those beneath the Changbaishan and A’ershan volcanic areas. It may be an upwelling channel from the mantle beneath the Songliao basin and adjacent area. This finding indicates the Songliao basin was a result of asthenospheric upwelling caused by subduction of the Pacific plate under the Eurasian plate. Keywords Tomography Northeast China Ray Relation between shallow-deep structures