Abstract
Remote sensing is a non-contact, long-distance detection technology. The reflection characteristics of a seismic wave can be used to detect remote and non-contact targets. Based on the reflection characteristics of a seismic wave, the underground structure in Tengchong Volcanic Area is explored. In order to further study the deep structure and magmatic activity of the crust in the volcanic area, we carried out a one-year mobile seismic observation. In this paper, nine broadband seismic stations were set up in the Tengchong Volcanic Area, and 3350 receiver function waveforms were collected. The crustal thickness, average wave velocity ratio, and Poisson’s ratio below these stations were calculated by the receiver function method, and the velocity structure near the Moho below these stations was evaluated. Combined with topographic data from SRTM3 (Shuttle Radar Topography Mission 3), this study reveals the dynamic relationship among crustal structure, crustal magmatism, and regional tectonic movement. Mantle upwelling plays an important role on the Moho uplift in the northern Tengchong Volcanic Area, and there are interconnected intracrustal magma chambers in the upper platform. The evaluation results of the Moho transition zone also indicate that the Dayingjiang fault is closely related to the tectonic activity of the Tengchong Volcanic fault.
Highlights
It is one of the main tasks of modern seismology to detect the Earth’s internal structure with seismic wave data
The distribution of stations used in the receiver function study is relatively discrete, which makes it difficult to reflect the structural details of magmatic activity in volcanic areas
Since Zhu and Kanamori put forward the receiver function H-k stack method, it has become a conventional tool to deal with the crustal structure [25]
Summary
It is one of the main tasks of modern seismology to detect the Earth’s internal structure with seismic wave data. In the past 10 years, the receiver function method for obtaining the structure of crustal and mantle discontinuities using teleseismic data recorded by broadband seismic arrays has developed rapidly and obtained a series of important results. Xu et al retrieved the 3D P-wave velocity structure of Tengchong and its adjacent areas using the data of the mobile seismic observation network, and analyzed the relationship between the low velocity anomaly and magmatic activity in the crust [23] He et al and Feng et al used the receiver function method to analyze the. The distribution of stations used in the receiver function study is relatively discrete, which makes it difficult to reflect the structural details of magmatic activity in volcanic areas To solve these problems, we have carried out temporary earthquake observation for more than one year by laying 9 broadband seismographs. We have improved the discussion about magma and justify it in a more concise way by applying more data and a 3-D model
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