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.
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.
The global seismic waveform data of magnitude 7 or above recorded by 10 seismic stations in the Himalaya region (from January 1, 2020 to December 31, 2020), including the name and location of stations, and the clear seismic waveform of each event filtered by the seismic event directory (the seismic directory is from USGS) to 10 stations. The waveform data is clipped to 100s before and 300s after the arrival of P wave, and the format is sac format. The header contains station information, event information, azimuth and other information. It is named in the form of "network. Station name. Channel. Component. D. year. Julian day - time. 000000. Event".
The data set includes cumulative 3-D deformation variables recorded by 50 continuous and mobile GPS stations 5 years after the 2015 mw7.8 Nepal earthquake. Data from published articles: Zhang, J., Zhao, B., Wang, D., Yu, J., and tan, K. (2021), dynamic modeling of postseismic deformation following the 2015 MW 7.8 Gorkha earth, Nepal, J. Asian Earth SCI., 215104781, Doi: 10.1016/j.jseaes.2021.104781. The post earthquake deformation data processing process is as follows: firstly, the original observation data are processed to obtain the time series under ITRF reference frame; Then, other effects unrelated to the Nepal earthquake, such as seasonal variation, interannual variation, plate effect, etc., are corrected; Thirdly, the post earthquake time series curve is fitted by logarithmic function; Finally, the post earthquake deformation of any period is calculated by fitting the curve. Five years after the earthquake, the accumulated deformation is nearly 13.8 cm. The horizontal accuracy is not less than 0.6cm, and the vertical accuracy is not less than 2.0cm.
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（ http://www.cgps.ac.cn/ ）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.
Main contents: the continental lithosphere has extensive heterogeneity, but its role in continental rifting is not clear. The effects of lithospheric heterogeneity on the continental rift model are studied using two-dimensional thermo mechanical simulation. Heterogeneity is mainly manifested in the lateral inhomogeneous continental lithosphere, which has a cold western (CW) and a hot Eastern (he) lithosphere. A series of experiments were carried out to explore the influence of lithospheric thermal state, weak zone and extension velocity on continental rift. The main results and implications are as follows: (1) on the he side, the extension of the cwh-e lithosphere always leads to the formation of wide rifts, while the CW side is not deformed（ 2) The existence of weak lithosphere in CW can lead to the formation of wide rift in the East and deep and narrow rift in the West（ 3) The thermal state of the lithosphere strongly influences the rift types and lithospheric deformation patterns. When the crust is extremely hot (tmoho = 900 ℃), a wide rift first appears on the he side, and then a narrow rift forms on the CW side. The extensional velocity mainly affects the time of rift formation, but has no significant effect on the type of rift. Many rift basins developed in the North China Craton (NCC) since the early Cenozoic in response to the subduction and retreat of the Pacific plate. The east of the North China Craton is dominated by wide rifts, while the west of the North China Craton is dominated by narrow rifts. The coexistence of these two types of rifts in the North China Craton is the result of lateral lithospheric heterogeneity, including the pre-existing weak lithospheric regions.
Main contents: the dynamic process of ocean continent subduction not only depends on the properties of subducted oceanic plate, but also depends on the properties and state of overlying continental plate, In particular, little is known about the influence of the thermal state of the continental lithosphere on the subduction dynamics. Using two-dimensional thermal mechanical numerical simulation method, the performance of the continental lithosphere with different thermal states in the ocean continent subduction process is discussed The main results and implications are as follows: (1) when the geothermal gradient of the overlying continental crust is low (10 ~ 15 ℃ km − 1), the oceanic plate begins to subduct at a low angle, and then, driven by its own negative buoyancy, the subduction angle gradually increases and rapidly retreats, forming an ocean basin with a width of 600 ~ 1100km, With the continuous retreat of the trench, the horizontal deviatoric stress in the overlying continental plate alternates between positive and negative, lithospheric thinning mainly occurs near the subduction zone, and the surface has obvious extension and subsidence. (2) when the geothermal gradient of the overlying continental crust is higher (greater than 15 ℃ km − 1), the retreat of the oceanic plate promotes the strong extension of the overlying continental plate, The horizontal deviatoric stress in the overlying continental plate is characterized by compression and then tension, resulting in the surface uplift and then slow subsidence. (3) increasing the age of the oceanic lithosphere will accelerate the retreat process of the trench, (4) the movement of the overlying continental plate towards the trench will slow down the retreat of the trench. When the geothermal gradient of the crust is greater than 17.5 ℃ km − 1, the hot continental crust will collapse and thrust to the subducted oceanic lithosphere, This process will also slow down the retreat of the trench. The spatial changes of the subduction process of the paleo Western Pacific plate in the early Cretaceous and their possible influence on the tectonic evolution of the East Asian basin It is considered that the development of the wide rift basin system in the Amur super terrane in the early Cretaceous is related to the slow retreat of the trench and the collapse of the hot crust; The relatively cold North China Craton lithosphere retreated rapidly due to oceanic trench, resulting in the development of passive rift basins on the continental margin
TANG Jiaxuan, CHEN Lin
The contents include: there is a sudden change of lithospheric thickness between the old Craton and the adjacent young active belt, Small scale mantle convection (boundary driven convection) can be induced by the transverse difference of temperature and density between the two. The boundary convection caused by the lithospheric step between the craton and the active zone and its role in the lithospheric thinning of the craton are discussed by using two-dimensional thermo mechanical numerical simulation method, When the density of the craton lithosphere is relatively high, the high-intensity craton lithosphere has a strong ability to resist boundary driven convection, and the thinning of the craton lithosphere is limited to the edge. However, the low-intensity craton lithosphere has a weak ability to resist boundary driven convection, When the density of the cratonic lithosphere is relatively small, no matter the strength of the cratonic lithosphere is high or low, the low density of the cratonic lithosphere can well inhibit the influence of boundary driven convection, The lithospheric thinning of the Archean North China Craton was confined by Phanerozoic active zones. The lithospheric thinning of the craton first occurred in the northern and Eastern margins and experienced a slow process, We believe that boundary driven convection may play an important role in the lithospheric thinning process of the North China Craton, especially in the initiation process of lithospheric thinning, but we can not rule out the joint action of other multiple mechanisms
（1）An Ms 6.0 earthquake struck Changning county, Sichuan basin, SW China on 17 June 2019, which caused huge casualties and economic losses. Four Ms greater than 5.0 events subsequently occurred around the Changning source area, three of which occurred within one week. In order to better understand the mechanism of these moderate-sized earthquakes, we determine 3-D high-resolution velocity models around the source area simultaneously relocating earthquakes using double-difference tomography. In the present study, we use a total of 53,487 P-wave and 52,527 S-wave arrival times from 8818 events recorded at 39 seismic stations. Our results show that focal depths of the Changning mainshock and most aftershocks are ~5–10 km, and they form a fault plane with a steep dip angle. Most earthquakes are underlain by the zone with low Vp, low Vs, and high Vp/Vs anomalies, reflecting the existence of fluids there. These results suggest that the Changning mainshock and other moderate-sized earthquakes might be associated with the influence of fluids that could decrease effective normal stress on the fault planes. These fluids might be related to the hot and wet mantle upwelling in the big mantle wedge due to the deep subduction of the Indian plate down to the mantle transition zone. A clear high-to-low velocity transition zone is observed at ~10 km depth beneath the Gongxian and Xingwen swarms, which matches well with the detachment layer revealed by deep seismic soundings in the area. All these results suggest that the structural contrast could control the mainshock generation and aftershock extension. （2）The Tanlu fault zone is the most significant active fault in eastern China, which generated the great 1668 Tancheng earthquake (M 8.5). It is still unclear whether or not there is a link between the great earthquake generation and the upper-mantle structure. To address this issue, we study P-wave upper-mantle tomography beneath eastern China using 44,047 teleseismic P-wave arrival times. Our results show that at depths<150 km, high-velocity (high-V) anomalies appear west of the Tanlu fault zone, whereas low-velocity (low-V) anomalies are visible east of the fault zone. Strong lateral heterogeneities are revealed along the fault zone. At depths of 230–470 km, northwest of the Tanlu fault zone, there are obvious low-V anomalies that may reflect hot and wet mantle upwelling, whereas to the east high-V anomalies are visible, which may reflect the detached Eurasian lithosphere (downwelling). In the mantle transition zone (MTZ), both high-V and low-V anomalies are revealed, and the widespread high-V anomalies may reflect the stagnant Pacific slab. Beneath the hypocenter of the 1668 Tancheng earthquake, intermittent low-V anomalies are revealed in the upper mantle down to the MTZ depth, which may reflect hot and wet mantle upwelling flow. Integrating the present results with previous findings, we deem that the Tancheng earthquake was affected by fluids from the hot and wet mantle upwelling associated with the lithospheric delamination. Complicated mantle convection, including both upwelling and downwelling flows, may occur under the Tanlu fault zone in the big mantle wedge above the stagnant Pacific slab in the MTZ. （3）Since the occurrence of the 2008 Wenchuan earthquake (Ms8.0), many researchers have conducted extensive seismological and geophysical observations and investigations and obtained important results about the Longmenshan fault zone. Crustal structure inferred from local tomography shows that seismic velocity exhibits significant changes across the Wenchuan earthquake hypocenter from the south to the north. To the south, obvious low-velocity (low-V) anomalies exist, whereas strong lateral heterogeneities are revealed to the north, which may explain why the aftershocks extend northeastward. The Wenchuan earthquake occurred at the boundary between high-velocity (high-V) and low-V anomalies and a significant low-V zone is revealed below the mainshock hypocenter, suggesting that the nucleation of the Wenchuan earthquake was related to partial melts and/or fluid effects and associated with the reduction of effective normal stress on the fault plane, due to high temperature and high pressure in the Longmenshan fault zone caused by the India-Asia collision. The upper-mantle structure inferred from teleseismic tomography shows that the Longmenshan fault zone is located in the transition zone from low-V anomalies beneath the Songpan-Ganzi block to high-V anomalies beneath the Sichuan basin. This structural feature extends down to 200−300 km depths. High-V anomalies in the mantle transition zone are connected with those in the upper mantle beneath the Burma arc, indicating that the Wenchuan earthquake could be associated with upwelling of hot and wet materials in the big mantle wedge formed by the deep subduction of the Indian plate. These results suggest that the generation of the Wenchuan earthquake was related to structural heterogeneities in not only the crust but also the upper mantle. In addition, the Wenchuan earthquake may be related to the lower crustal flow, crustal shortening and Zipingpu Reservoir triggering.
LEI Jianshe, ZHANG Bing
The data include the cross-correlation function extracted from the continuous seismic background noise data of vertical component recorded by 54 fixed seismic stations and 17 mobile seismic stations in Jiuyishan and its adjacent area from May 2016 to June 2017, and the final inversion of crustal S-wave velocity. The dispersion curves of group velocity and phase velocity of 2-40s are obtained by time-frequency analysis. The inversion imaging results show that the structural characteristics of the crust and upper mantle of the Yangtze block and the Cathaysian Block are significantly different. The S-wave velocity distribution map of 10-20km shows linear and continuous low velocity anomalies, which may be the specific boundary between the Yangtze block and the Cathaysian Block. The imaging results provide seismological constraints for understanding the tectonic evolution history of South China. The uploaded data provide valuable data and information for others to further study the structural characteristics of Jiuyi mountain and its adjacent areas.
The data include the location information of 255 seismic stations in Qinghai Tibet Plateau, North China Craton and South China block junction area, teleseismic receiver function waveform, HK result and crustal S-wave velocity inversion using receiver function (Gauss coefficient is 2.0) and surface wave. Based on the data of 30-90 degree epicentral distance and more than 5.5 earthquake events recorded by 146 fixed stations set up by China Seismological Bureau for 2 years and 109 mobile stations set up by Institute of Geology and Geophysics of Chinese Academy of Sciences for 12-18 months, the time domain iterative deconvolution method of CPS program is used to extract the radial convergence function. The results show that: the crust structure of the typical craton is still preserved in the core area of Ordos and Sichuan Basin, and the low velocity layer of the central crust of the East-West collision subduction of the North China Craton in the south of Ordos is not preserved. The lower crust of Sichuan basin may have been embedded into the crust of Qinghai Tibet Plateau along the Longmen Mountain; The West Qinling and the boundary area of Qinling Dabie orogenic belt have thick crust, low wave velocity ratio and high S-wave velocity structure. The uploaded data provide valuable data and information for others to further study the structural characteristics of the northeastern margin of the Qinghai Tibet Plateau and its adjacent areas.
The data include the location information of 154 seismic stations in the middle and southern segment of Tan Lu fault zone and its adjacent area, the teleseismic receiver function waveform and the crustal S-wave velocity inversed by receiver function (Gauss coefficient is 5.0) and surface wave. By selecting 63 fixed stations set up by China Seismological Bureau and 91 mobile stations set up by Institute of Geology and Geophysics of Chinese Academy of Sciences with observation time of one year to record 30-90 degree epicentral distance and events with magnitude greater than 5.5, the time domain iterative deconvolution method of CPS program is used to extract the radial convergence function. The results show that the Moho depth and the average VP / vs ratio of the crust in the study area mainly vary in the range of 25-38km and 1.65-1.95, respectively, and the crustal structure is roughly divided into three parts from south to north along the Cretaceous tiefuling fault and Triassic Lu'an fault and their eastward extension. The uploaded data provide valuable data and information for others to further study the structural characteristics of the Tan Lu fault zone and its adjacent areas.
The data include the location information of 14 seismic stations in Sichuan Basin, the teleseismic receiver function waveform (Gauss coefficient is 5.0) and the thickness and VP / vs ratio of sedimentary and bedrock layers obtained by multi-layer H-K superposition method. By selecting the epicentral distance of 30-90 degrees and the teleseismic events greater than 5.5 degrees recorded by 4 fixed stations set up by China Seismological Bureau and 10 mobile stations set up by Institute of Geology and Geophysics of Chinese Academy of Sciences from 2010 to 2012 in the study area, the time domain iterative deconvolution method is used to obtain the radial convergence function. The results show that: the thickness of sedimentary layer is mainly distributed in 4.2-7.6 km, and the wave velocity ratio is generally more than 1.87; the thickness of bedrock is mainly distributed in 33.4-41.8 km, and the wave velocity ratio is generally less than 1.74. The uploaded data provide valuable data and information for others to further study the structural characteristics of Sichuan Basin.
The data include the location information of 23 seismic stations in Linfen Rift Valley and its surrounding areas and the teleseismic receiver function waveforms. By selecting the 30-90 degree epicentral distance and more than 5.5 earthquake events recorded by 23 high-frequency mobile seismic stations deployed by Institute of Surveying and Geophysics of Chinese Academy of Sciences in November 2017 with observation duration of one month, the radial convergence function is extracted by using the time domain iterative deconvolution method of CPS program. The results show that there are low velocity bodies of different scales in the middle and lower crust of Linfen rift area, and the depth of seismogenic layer increases from ~ 25km to ~ 34km from south to north, which roughly corresponds to the bottom interface of low velocity bodies in the crust; Most of the relocation earthquakes are located in the transition zone between high and low velocity bodies, one of which has a focal depth of 32km. The m7.75 Linfen earthquake is located in the high velocity body, and the M8.0 Hongdong earthquake is located at the bottom of the high velocity body. The uploaded data provide valuable data and information for others to further study the structural characteristics of Linfen Rift Valley and its adjacent areas.
The data include the location information of 17 seismic stations in Hanzhong Basin and its surrounding area, the teleseismic receiver function waveform and the crustal S-wave velocity inversed by receiver function and surface wave. Among them, each station includes two receiving functions, the Gaussian coefficient is 2.0, which are in the range of 30-60 ° And 60-90 ° The waveform superimposed within the epicentral distance. Based on the epicentral distance of 30-90 degrees and teleseismic events with magnitude greater than 5.5 recorded by 6 fixed stations set up by China Seismological Bureau for 2 years (2012-2014) and 11 mobile stations set up by Institute of Surveying and Geophysics of Chinese Academy of Sciences in December 2017, the time domain iterative deconvolution method of CPS program is used to extract the receiver function. The results show that the thickness and velocity of shallow sediments are different in different areas of Hanzhong Basin, the velocity changes gently in some areas of Moho, and the distribution of the upper and lower interfaces of focal depth (4-16 km) corresponds to the bottom layer of low velocity body and the top layer of high velocity body. The uploaded data provide valuable data and information for others to further study the structural characteristics of Hanzhong Basin and its adjacent areas.
The data set is mainly shown in the article https://doi.org/10.1016/j.pepi.2019.04.003 In the study of the. In this study, 19 inversion points were selected based on the seismic stations in the Cathaysia Block. Under the constraint of shallow P-wave velocity, the joint inversion of the P-wave receiver function and surface wave dispersion was carried out, and the S-wave velocity structure under the station was obtained. The dataset contains 19 files in the format of DAT, such as cathaysia01.velocity.dat. The data set can be used to show the velocity structure of the lithosphere in the Cathaysia Block and to see the deep mechanism corresponding to a large amount of granite outcropping in the area.
The data set is mainly shown in the article https://doi.org/10.1016/j.pepi.2019.04.003 The study includes the distribution of the average thickness of the crust and the average velocity ratio of the crust obtained by stacking the P-wave receiver function h-kappa-c of stations in Cathaysia Block. The dataset contains one file in DAT format: Cathaysia_ moho_ vpvs.dat。 The data set can be used to show the undulation characteristics of Moho in the Cathaysia Block, to see the transverse distribution characteristics of crustal thickness and crustal wave velocity ratio in the Cathaysia Block, and to explore the difference of average crustal composition in the Cathaysia Block.
The data set is mainly shown in the article https://doi.org/10.1016/j.pepi.2020.106617. The S-wave velocity structure under the station is obtained by using the joint inversion of the P-wave receiver function and the group velocity dispersion of 42 stations located near the Dahutang mining area in Jiangxi Province. The dataset contains 42 files in the format of DAT: for example, dahutang.jx46.velocity.dat. The data set represents the lithospheric velocity structure of the Dahutang mining area and understands the deep mechanism of Dahutang polymetallic mineralization.
The data set is mainly shown in the article https://doi.org/10.1016/j.pepi.2020.106617, which includes the distribution of the average thickness of the crust and the average Vp/Vs ratio of the crust based on the h-kappa stacking of the P-wave receiver functions on 42 stations near the Dahutang mining area in Jiangxi Province. The dataset contains 1 file in DAT format: Dahutang_ moho_ vpvs.dat。 The data set can be used to show the Moho undulation feature of the Dahutang mining area, perspective the transverse distribution characteristics of crust and crustal wave velocity ratio in Dahutang polymetallic metallogenic area, and then discuss the difference of average composition of crust inside and outside the mining area.
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, .