Direct P-wave records of portable seismic array in the southeastern Iranian plateau(2017.03-2018.9)

Seismic observations can be used to constrain the seismic velocity structures and deformation patterns of the crust and upper mantle. The southeastern Iranian plateau is the transitional zone from subduction to collision. The study of this region can provide an important basis for understanding the dynamic progresses of the plate convergence and associated tectonic responses. The data comes from the portable seismic array deployed by this research group. The site selection requirements are strict. All stations are equipped with Trillium 120PA seismometer (120 s-175 Hz) and Taurus digital collector. This data set is the waveform data from the first 100 s to the last 200 s of the direct P wave. Event magnitudes are greater than or equal to 5.0, and epicenter distances range from 30° to 90°. The data can be used to decipher the deep dynamic processes of the subduction-collision transition zone.

0 2022-05-11

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 2022-04-15

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

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