P-wave tomography and relation between shallow and deep structures beneath the Songliao basin |
| |
Authors: | Qiyan Yang Qingju Wu Xiaojun Ma Fengxue Zhang Yanrui Sheng |
| |
Institution: | 1.Earthquake Administration of Hebei Province, Shijiazhuang 050021, China2.Institute of Geophysics, China Earthquake Administration, Beijing 100081, China3.Earthquake Administration of Ningxia Autonomous Region, Yinchuan 751000, China |
| |
Abstract: | 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 |
本文献已被 CNKI 等数据库收录! |
| 点击此处可从《Earthquake Science》浏览原始摘要信息 |
| 点击此处可从《Earthquake Science》下载免费的PDF全文 |