Near seismic waveform of nangabawa short period dense seismic array (2020.06-2020.07)

The data is the near seismic waveform of nangabawa short period dense seismic array, which contains the original seismic waveform and the preprocessed seismic waveform. The original data are the seismic waveforms cut according to four near earthquake events (Ms 5.2 in Tangshan, Hebei, Ms 5.4 in Huocheng, Xinjiang, Ms 4.2 and Ms 4.0 in Bomi, Tibet). The waveform length is 120s before P wave and 1800s after P wave. Preprocessing includes re-cut the waveform (- 20-100s), band-pass filtering (the frequency band range used in Tangshan, Hebei and Huocheng, Xinjiang is 0.1-1hz, and Bomi, in Tibet is 0.1-2hz), rtrend, rmean, and the ZNE component is rotated to the ZRT component. The quality of the data is good.The fine structure of underground lithosphere can be analyzed by near earthquake waveform.

0 2021-09-23

Namqa Barwar Magnetotelluric Profile data (2020)

The purpose of this work is to carry out high-resolution magnetotelluric sounding profile observation near the East tectonic Festival on the basis of the previous three-dimensional magnetotelluric sounding array in the eastern Qinghai Tibet Plateau, so as to reveal the deep structure of the regional lithosphere, understand the relationship between regional fault activity and deep electrical structure, and study the deep rheological state of the India Eurasia plate collision. The data set contains the "fine structure and shallow response of lithosphere in key areas" special topic of the secondary scientific research of Qinghai Tibet Plateau "Magnetotelluric sounding profile data in the mission. Specifically, it includes 30 magnetotelluric sounding data station data files and 1 data coordinate file collected within a length of about 200km, from Beibeng of Motuo County to Qingduo in Bomi County. The data quality is generally good, with effective frequency range of about 100hz-2000s. However, due to local interference, some stations are not ideal after 1Hz In addition, the regional terrain and coverage are complex, the natural electric field of groundwater is strong, and there is a strong three-dimensional distortion effect in the data.

0 2021-09-23

Deformation data after 2008 Wenchuan earthquake (2008-2018)

The data set consists of 93 continuous and mobile GPS stations recording the cumulative three-dimensional deformation variables 10 years after the 2008 mw7.9 Wenchuan earthquake. GPS daily sampling time series data are mainly from the website of China Seismological Bureau( )Diao, F., Wang, R., Wang, Y., Xiong, X., Walter, T.R. (2018), fault behavior and lower critical physiology informed from the first seven years of postseismic GPS data after the 2008 Wenchuan earthquake, earth planet. SCI. Lett., 495, 202-212, DOI: 10.1016/j.epsl.2018.05.020. We process the post earthquake deformation data as follows: first, we correct other effects unrelated to the Wenchuan earthquake, such as seasonal variation, interannual variation, plate effect, etc; Thirdly, the post earthquake time series curve is fitted by exponential function and logarithmic function; Finally, the post earthquake deformation of any period is calculated by fitting the curve. Ten years after the earthquake, the accumulated deformation is nearly 21 cm. The horizontal accuracy is not less than 1.7 cm, and the vertical accuracy is not less than 4 cm.

0 2021-07-05

Optimal orientation of magnetic anomalies in Xuhuai and its adjacent areas

The data set mainly shows the magnetic lineament corresponding to different radii. The magnetic lineament is obtained by Radon transform of magnetic anomaly data, which can be used to detect more detailed individual alignments on a map, and can be compared with other anisotropic data. The dataset contains one dat file: magnetic_ lineament.dat。 The data set can be used to display the magnetic lineament with different radius in Xuhuai area and its adjacent areas. Combined with other geophysical and geological observations, the deformation mechanism of Xuhuai arc can be further discussed based on the results, .

0 2021-06-11

Satellite Bouguer gravity anomaly in Xuhuai and its adjacent area

The data set mainly shows the distribution of satellite Bouguer gravity anomaly in Xuhuai area. The analysis and processing of Bouguer gravity anomaly can better constrain the size and location of density anomaly at different depths. The dataset contains 1 file in DAT format: Gravity_ Xuhuai.dat。 The data set can be used to display the satellite Bouguer gravity anomaly data in Xuhuai and its adjacent areas. If combined with other geophysical observations and geological inference, the formation process of Xuhuai tectonic arc can be better constrained, and then a self consistent geological model related to the formation and evolution of Xuhuai tectonic arc could be proposed.

0 2021-06-03

Measurement data from 13 portable crustal displacement observation stations along Gyirong - Nyima profile in Tibetan Plateau (2018-2019)

The data set is the original repeated GPS observation data along Gyirong - Nyima profile trans active deformation Himalayan orogenic belt in Tibet Plateau. The data are measured twice in 2018 and 2019, including the data of 13 stations, and the data quality is good. Through the observation data of these observation points, combined with the continuous GPS observation profile data that the project research team has deployed along Yadong Gulou in the Himalayan orogenic belt, we can reveal the horizontal and vertical distribution characteristics of the northward converging strain of the Indian continent in the key parts of the Himalayan orogenic belt, understand the current uplift state of the Himalayan orogenic belt and its correlation with horizontal movement, and combine with the active faults Based on the theory of motion dislocation, the quantitative distribution of strain between earthquakes in the main boundary fault (MBT) and the main central fault (MCT) is studied, as well as the strain accumulation characteristics, fault locking range and fault locking degree between earthquakes, which provide important constraints for evaluating the seismic risk of active faults in the study area. Combined with the 2015 Nepal earthquake rupture model, the southern margin of Tibetan Plateau is studied from the perspective of motion to dynamics Lithospheric rheological characteristics.

0 2021-05-14

The data of isotropic velocity and radial anisotropy in western Tibet

This data comes from the result of teleseismic data, mainly including the velocity and radial anisotropic structures beneath western Tibet. In the process of processing, bandwidth filtering is adopted, and the filtering range is 0.05-2 Hz. Due to the use of teleseismic data, the cross-correlation method is used in the acquisition process to "align" the waveform. The data quality is good, because the extracted data are all from the earthquakes with magnitude greater than 5.0 located in the global seismic catalog, and each event has an obvious take-off point. The data can be used by other seismologists to reconstruct and analyze the underground structures in this area.

0 2020-11-02

Measurement data from 26 crustal displacement observation stations of Qilian mountain (2017-2018)

High-frequency continuous GPS observation can effectively monitor the kinematics of crustal deformation. The Qilian Mountains region is an important constraint boundary of the northeastern margin of the Qinghai-Tibet Plateau. The study of this region can provide important implications for the dynamic process of the growth and uplift of the Tibetan Plateau and the internal deformation of the Tibetan Plateau. At the local level, it can be discussed whether there is creepage in the Haiyuan fault and the movement mode of the northeastern margin of the Qinghai-Tibet Plateau. The data comes from 26 fixed stations set up by the research group in the Qilian Mountain area. The site selection requirements are strict, and the high-frequency continuous GPS receiver is Provided by trimble, the data quality is good, the data can be applied not only to geodynamic research, but also to related earth science research such as meteorological precipitation.

0 2020-05-30