The continental collision and subduction between the North China Craton Yangtze Plate resulted in complex multistage tectonic episodes of Tanlu fault zone. To adequately understand geodynamic processes collision, we construct a high-resolution shear-wave velocity model crust uppermost mantle using full-wave ambient noise tomographic method based on new broadband dense seismic array across Our r...

Perforation in internal upset transition zone is one of the main failure styles for drill pipes. Due to the flow channel specificity of upset transition zone, in this paper, drill pipe failure analysis from the point of flow erosion was put forward. Flow field of drilling fluid in the internal upset transition zone of U127 mm API IEU S135 drill pipe under various conditions were obtained using ...

Fault zones are thought to consist of regions with reduced seismic velocity. When sources are located in or close to these low-velocity zones, guided seismic head and trapped waves are generated which may be indicative of the structure of fault zones at depth. Observations above several fault zones suggest that they are common features of near fault radiation, yet their interpretation may be hi...

[1] Upper mantle seismic velocity structures in both vertical and horizontal directions are key to understanding the structure and mechanics of tectonic plates. Recent deployment of the USArray Transportable Array (TA) in the Midwestern United States provides an extraordinary regional earthquake data set to investigate such velocity structure beneath the stable North American craton. In this pa...

[1] In this study, we analyzed the seismic phases S, SKS, and SKKS from 31 deep-focus earthquakes in the Tonga-Fiji region recorded in North America between epicentral distances of 85 and 120 . The differential traveltimes and amplitude ratios for these phases reveal clear epicentral distance trends not predicted by standard one-dimensional (1-D) reference Earth models. The increase of the S/SK...

• increased frequency of high-velocity weapon wounds, which produce greater tissue destruction than the more-frequently seen low-velocity wounds, which are the ones seen in the civilian community; • increased frequency of multiple fragment wounds (from artillery and mortar shells, bombs, booby traps, land mines); • evacuation of casualties from the combat zone to multiple medical treatment faci...

Measurements were made of the transport of 2,4-dichlorophenoxyacetic acid-(14)C (2,4-D) through segments cut from the region of the distal abscission zone in young and old primary leaves of Phaseolus vulgaris L. When old leaves were used basipetal transport of 2,4-D in segments including pulvinar tissue, abscission zone, and petiolar tissue was much less than in wholly petiolar segments. In bot...

The paper deals with an approach to the Inverse Problems based upon their relations to the Boundary Control Theory (the BC-method). A possibility to recover a velocity c = ("") ?1=2 via response operator of the Maxwell dynamical system is discussed. The main result is that the operator (plus values of c; @c @ at a boundary) determines velocity uniquely in the maximal near-boundary layer in whic...

A minimal model is constructed for two-dimensional fracture propagation. The heterogeneous process zone is presumed to suppress stress relaxation rate, leading to non-quasistatic behavior. Using the Yoffe solution , I construct and solve a dynamical equation for the tip stress. I discuss a generic tip velocity response to local stress and find that noise-free propagation is either at steady sta...