西安地电台环境噪声干扰的实验研究

对西安地电台周围环境噪声声干扰进行了实验研究，结果表明，环境噪声的衰减是很快的，地电测区避开企带来单位２００ｍ，环境噪声电平即可衰减１个数量级。只工作认真仔细，在大城市近郊能够选出较好的地电台址。     

利用小波变换降低环境噪声对测深数据的影响

本文针对测深数据在环境噪声处理中存在的问题,利用海底信号和环境噪声小波变换模的极大值在不同尺度下具有不同的传播特性,     

Ambient noise during rough weather and cyclones in the shallow Bay of Bengal

This paper presents ambient noise analysis during rough weather, using time series measurements from an automated noise measurement system in the shallow southwest Bay of Bengal during October–November 2010. The period witnessed low-pressure events including depressions and cyclones, with JAL cyclone passing close to the measurement site. The time series noise level shows a shift in mid-October, after which deep depressions and cyclones formed, with an average increase of 5–10 dB in the lower band and 2–3 dB in the higher band of frequencies. Furthermore, correlation between noise level and wave height(data from wave rider buoy deployed at the site) for sea state scale 3 and above shows good correlation with an increase in noise level with increase in wave height, the effect being most pronounced at 0.5 kHz. The noise captured during JAL was analysed to identify the spectrum components due to convective precipitation and heavy wind/wave activity and shows anomalously high levels during the crossing of the cyclone. Rain noise spectra from the rain bands associated with the wall of the cyclone are reported. This has been correlated with radar refl ectivity measurements to ascertain the presence of rain, and discriminate between convective and stratiform types. Also, vertical directionality pattern of ambient noise during JAL showed clearly distinct surface contributions. On the whole, knowledge of ambient noise fields during high sea states and precipitation is useful in optimizing SONAR performance. The findings at the study site have been compared with measurements from other shallow water locations during rough weather.     

利用小波变换降低环境噪声对测深数据的影响

针对测深数据在环境噪声处理中存在的问题,利用海底信号和环境噪声小波变换模的极大值在不同尺度下具有下同的传播特性,提出了利用多尺度小波变换分折测深数据的方法,从而达到降低环境噪声对测深数据影响的目的,通过计算表明该方法具有较好的效果。     

峨眉山大火成岩省地壳横波速度结构特征及其动力学意义

峨眉山大火成岩省是我国境内最早获得国际学术界广泛认可的大火成岩省,对于认识地幔柱形成与作用机理、生物与环境演化、资源富集与成矿机制等具有重要意义.本文利用峨眉山大火成岩省宽频带地震台阵(COMPASS-ELIP)以及云南、四川区域地震台网的部分台站资料,基于分格加权叠加策略实现接收函数和面波频散在信息来源和分辨尺度方面的协同;进而开展联合反演,重建了峨眉山大火成岩省关键剖面下方的地壳横波速度结构.研究结果显示:研究区地壳平均S波速度,沿剖面呈现自西向东先增大后减小的分带性,内带中、下地壳速度较高,尤其是下地壳存在明显的高速异常(V_s约3.8~4.2 km·s~(-1))丽江—小金河断裂带和水城—紫云断裂带的东西两侧,中上地壳存在低速层(V_s约3.3 km·s~(-1)),尤其是水城—紫云断裂带东西两侧的中地壳低速层尤为明显.结合本文以及现有的系列研究结果,进一步确认内带中、下地壳高速对应二叠纪古地幔柱作用的遗迹,大规模岩浆的底侵和内侵,不仅改造了滇中块体的地壳结构和组分,而且也改变了地壳的流变强度,进而对现今青藏高原东南缘的深部过程产生了深远影响.     

兰州地震台阵环境噪声调研分析

随着我国社会经济的发展,地震台站观测环境破坏日益严重。对兰州地震台阵环境噪声进行调研,定量分析并提供该台阵与国际标注各大干扰源的直线距离,以充分了解各干扰源对地震台阵的影响程度。结果发现,兰州地震台阵目前基本达到Ⅰ级台站环境噪声水平,满足台阵观测条件。