The estimation of seismic shaking is essential for a realistic assessment the local hazard and implementation effective strategies prevention mitigation risk. One most important aspects in analysis site recognition bedrock its depth. Unfortunately, these data are not always easy to evaluate, especially areas where thickness loose or poorly consolidated sediments high. This article illustrates c...

The origin of the high content wet gases in coalbed seams is very important geologically, especially Enhong syncline China. present study focuses on role material that generates hydrocarbons. effect pore structure generation has not been thoroughly examined. paper characterizes coal “wet gas area” and “dry area”. structures two areas are shown to have different features, which affect distributi...

Reflection tomography in the migrated domain can help reconstruct heterogeneous, anisotropic velocity fields needed for accurate depth imaging of complex geologic structures. The presence of anisotropy, however, increases the uncertainty in velocity analysis and typically requires a priori constraints on the model parameters. Here, we develop a 2D P-wave tomographic algorithm for heterogeneous ...

A haramiyid tooth is described from the Upper Jurassic of Tendaguru in southwestern Tanzania, East Africa. The specimen, identified tentatively as a lower posterior premolar, is made the holotype of a new taxon, Staffia aenigmatica gen . e t sp. nov. which is placed in the Haramiyida . Staffa gen . nov. shares several features with Thomasia from the Late Triassic to Early Jurassic of Europe, no...

Three-dimensional pseudospectral modeling for a realistic scale problem is still computationally very intensive, even when using current powerful computers. To overcome this, we have developed a parallel pseudospectral code for calculating the 3-D wavefield by concurrent use of a number of processors. The parallel algorithm is based on a partition of the computational domain, where the field qu...