Next Article in Journal
Automated Assessment and Microlearning Units as Predictors of At-Risk Students and Students’ Outcomes in the Introductory Programming Courses
Previous Article in Journal
Numerical Evaluation of Structural Safety for Aged Onshore Wind Foundation to Extend Service Life
Previous Article in Special Issue
Optimized Refraction Travel Time Tomography
Open AccessArticle

Teleseismic Tomography for Imaging the Upper Mantle Beneath Northeast China

by Zhuo Jia 1,2 and Gongbo Zhang 1,2,*
1
College of Geo-exploration Science and Technology, Jilin University, Changchun 130026, China
2
Ministry of Land and Resources Key Laboratory of Applied Geophysics, Jilin University, Changchun 130026, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(13), 4557; https://doi.org/10.3390/app10134557
Received: 30 May 2020 / Revised: 23 June 2020 / Accepted: 28 June 2020 / Published: 30 June 2020
(This article belongs to the Special Issue Seismic Tomography)
Tomographic imaging technology is a geophysical inversion method. According to the ray scanning, this method carries on the inversion calculation to the obtained information, and reconstructs the image of the parameter distribution rule of elastic wave and electromagnetic wave in the measured range, so as to delineate the structure of the geological body. In this paper, teleseismic tomography is applied by using seismic travel time data to constrain layered crustal structure where Fast Marching Methods (FMM) and the subspace method are considered as forward and inverse methods, respectively. Based on the travel time data picked up from seismic waveform data in the study region, the P-wave velocity structure beneath Northeast China down to 750 km is obtained. It can be seen that there are low-velocity anomalies penetrating the mantle transition zone under the Changbai volcano group, Jingpohu Volcano, and Arshan Volcano, and these low-velocity anomalies extend to the shallow part. In this paper, it is suggested that the Cenozoic volcanoes in Northeast China were heated by the heat source provided by the dehydration of the subducted Pacific plate and the upwelling of geothermal matter in the lower mantle. The low-velocity anomaly in the north Songliao basin does not penetrate the mantle transition zone, which may be related to mantle convection and basin delamination. According to the low-velocity anomalies widely distributed in the upper mantle and the low-velocity bodies passing through the mantle transition zone beneath the volcanoes, this study suggests that the Cenozoic volcanoes in Northeast China are kindred and have a common formation mechanism. View Full-Text
Keywords: teleseismic tomography; Fast Marching Methods; subspace method; Northeast China teleseismic tomography; Fast Marching Methods; subspace method; Northeast China
Show Figures

Figure 1

MDPI and ACS Style

Jia, Z.; Zhang, G. Teleseismic Tomography for Imaging the Upper Mantle Beneath Northeast China. Appl. Sci. 2020, 10, 4557.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop