Abstract Triplicated P waveforms related to the 410‐km discontinuity from five intermediate‐depth earthquakes in central Philippines are clearly recorded by Chinese Digital Seismic Network, but some branches of S‐wave triplications obscure. Matching observed P‐wave with synthetics through a grid‐search technique, we obtain best‐fit 1D velocity model near beneath northeastern South China Sea. In such model, low‐velocity layer (LVL) is found reside atop mantle transition zone, and it...

Abnormal first-arrival times in the automatic picking significantly affect structural inversion and static correction. After implementing an picking, manual intervention is still required to correct or eliminate false times, which seriously affects efficiency of picking. Therefore, it necessary develop removal methods for abnormal times. Here, we propose a distance-based outlier detection algorithm automatically effectively In order identify each time decomposed into receiver delay shot...

Due to low cost and nondestructive characteristics, the passive surface-wave imaging has shown great potentials in urban near-surface exploration. However, methods are facing with many challenges practical applications, such as uneven noise source distribution complex site environment, which will seriously affect dispersion quality of surface waves, result failure retrieving accurate curve inaccurate inversion. Therefore, data screening is required improve accuracy imaging. This process...

Summary In eastern alluvial plain and western desert of China, near-surface absorption is the main reason that leads to energy attenuation seismic wave, especially for high-frequency components. To eliminate effect on wave propagation, we put forward a new compensation technique based visco-elastic equation continuation. First, build mathematic model from micro-log data. Then, joint with Q value & velocity inversion, obtain field at top high-velocity layer using The application this shows...

In alluvial plain, near‐surface absorption of seismic wave is the main reason that leads to energy attenuation, especially for its high‐frequency components. To eliminate effect on propagation, this paper put forward a new compensation technology using visco‐elastic equation continuation. First, we build mathematic model derived from micro‐logging data. Then, together with Q value & velocity model, extend received signal top high‐velocity layer The application at YX area shows good result:...

Drawing from premier marketing reports and retailing literatures about China, this article analyzes the evolution of retail channels in China 2000 to 2015. Under punctuated equilibrium paradigm, we examine interactions between retailers consumers by using competitive transaction cost analysis. We find that China’s channel since has been driven unique factors: (a) government’s economic reform policies introduction Internet technology; (b) behavioral differences based on an urban-rural...

We examine the learning effects of borrowers' failures in online lending. Based on funding ratios loan listings lending, we first explore role failure degree future performance. Further, disaggregate into complete and incomplete failure, compare theirs effects. Using a large sample 610,000 applications over six years from Chinese leading lending platform Renrendai, use ratio to quantifiably measure each listing's conduct series tests. The results show that: (1) Borrowers' prior is negatively...

Different from the normal time-lapse seismic technology, technology with non-repeating acquired data utilize existing multi-period different geometries at exploration period of same area. Not only change reservoir parameters cause property differences two-period but also difference geometries, this uncertainty has become a fundamental problem in application technology. In order to solve problem, paper takes advantage 3D Gaussian beam simulating method for illumination analysis model, then we...

Seismic tomography is an important method of subsurface velocity model building. However, it challenging to determine the geometry layers in complex areas using only first-arrivals. We propose a joint multiscale deformable layer (MDLT) use first arrivals and reflection traveltimes simultaneously inversion. The results synthetic tests show that MDLT can accurately recover some layered models, with higher stability accuracy than first-arrival MDLT. Presentation Date: Wednesday, October 17,...

Constructing the deep velocity model is an important research topic in exploring structure of petroliferous basins. It necessary to study effect different offsets wide-angle seismic data on inversion structures and establish a strategy that suitable for building. In this paper, we use multi-scale deformable layer tomography investigate capability first-arrival at inverting depths, propose combining layer-stripping interface smoothing invert structures. Synthetic tests indicate proposed can...

<p>The South China Sea (hereafter as SCS) located in the southeastern Asia has been affected by subduction of western Pacific, Indo-Australian and Eurasian plates (Sun et al., 2018). Broadband P waveforms from Digital Seismograph Network (Zheng 2010) for three intermediate-depth earthquakes that occurred closely Mindoro, Philippine are used to detect velocity structures lowermost upper mantle transition zone (MTZ) beneath northern SCS. The study area is divided into five...