TTI介质弹性波近似解耦波动方程

来源 :地球物理学报 | 被引量 : 0次 | 上传用户：scg5252

【摘要】

：

借助Christoffel方程可求解出各向异性介质弹性波精确频散关系.利用近似方法进行处理,再通过傅里叶逆变换将频率波数域算子变换为时空域算子,可导出解耦的 qP波或 qS波波动方程.本文在 TTI介质弹性波精确频散关系的基础上,利用近似配方法推导了 qP波和 qSV波近似频散关系,通过傅里叶逆变换推导了 TTI介质 qP波和 qSV波解耦的波动方程.为了验证近似频散关系的有效性,利用两组模型参数对其进行数值计算,分析了相对误差在不同传播方向上的分布.随后使用有限差分方法分别对均匀、层状及复杂 TTI介质

【作者】

：

梁锴孙上饶曹丹平印兴耀

【机构】

：

中国石油大学(华东)地球科学与技术学院,青岛 266580

【出处】

：

地球物理学报

【发表日期】

：

2021年12期

【关键词】

：

TTI介质频散关系波动方程解耦近似配方法

下载到本地 , 更方便阅读

下载此文赞助VIP

声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架

论文部分内容阅读

其他文献

任意各向异性介质三维非结构谱元法直流电阻率正演模拟研究

各向异性是地电异常解释中不可忽视的因素,广泛存在于裂隙或层理发育的地质环境中.本文针对任意各向异性条件下直流电阻率法三维正演问题进行研究,结合非结构谱元法建立模拟算法,充分利用谱方法的指数收敛性以及非结构有限元对地形和复杂异常体刻画能力,提高计算精度和效率.通过灵活的四面体网格剖分和高阶谱插值,实现了复杂介质任意各向异性模型电阻率响应的高精度数值模拟.我们首先通过层状各向异性模型验证本文非结构谱元法的计算精度,进而我们以半空间中立方体模型为例分析各向异性对电阻率响应的影响特征,并通过计算针对不同各向异性参

期刊

谱元法非结构网格任意各向异性直流电阻率法正演模拟

The Anomalous Mei-yu Rainfall of Summer 2020 from a Circulation Clustering Perspective: Current and

Highly unusual amounts of rainfall were seen in the 2020 summer in many parts of China, Japan, and South Korea. At the intercontinental scale, case studies have attributed this exceptional event to a displacement of the climatological western North Pacifi

期刊

circulation clusteringmei-yu front2020 summer rainfallclimate projections

Toward Understanding the Extreme Floods over Yangtze River Valley in June?July 2020: Role of Tropica

The extreme floods in the Middle/Lower Yangtze River Valley (MLYRV) during June?July 2020 caused more than 170 billion Chinese Yuan direct economic losses. Here, we examine the key features related to this extreme event and explore relative contributions

期刊

summer extreme floodsMiddle/Lower Yangtze RiverEl Ni?oIndian Ocean SSTdecada

Magnitude, Scale, and Dynamics of the 2020 Mei-yu Rains and Floods over China※

Large parts of East and South Asia were affected by heavy precipitation and flooding during early summer 2020. This study provides both a statistical and dynamical characterization of rains and floods affecting the Yangtze River Basin (YRB). By aggregatin

期刊

East Asian summer monsoon2020 China floodsYangtze River basinmei-yu frontext

The Extraordinary Rainfall over the Eastern Periphery of the Tibetan Plateau in August 2020※

A large amount of accumulated precipitation was recorded over the Eastern Periphery of the Tibetan Plateau (EPTP) in August 2020. Using hourly rain gauge records and the ERA5 reanalysis dataset, we analyzed the unique characteristics of rainfall in August

期刊

intense rainfallsummer 2020Eastern Periphery of the Tibetan Plateauwestern Si

Subseasonal and Synoptic Variabilities of Precipitation over the Yangtze River Basin in the Summer o

Summer precipitation over the Yangtze River basin (YRB) in 2020 experienced a strong subseasonal and synoptic fluctuation in addition to contributing to an exceptionally large seasonal mean precipitation. The cause of this higher-frequency fluctuation is

期刊

Yangtze River precipitationsynoptic and subseasonal variabilitiesmeridional sw

Seasonal Rainfall Forecasts for the Yangtze River Basin in the Extreme Summer of 2020※

Seasonal forecasts for Yangtze River basin rainfall in June, May–June–July (MJJ), and June–July–August (JJA) 2020 are presented, based on the Met Office GloSea5 system. The three-month forecasts are based on dynamical predictions of an East Asian Summer M

期刊

seasonal forecastingflood forecastingYangtze basin rainfallEast Asian Summer

Why Does Extreme Rainfall Occur in Central China during the Summer of 2020 after a Weak El Ni?o?※

In summer 2020, extreme rainfall occurred throughout the Yangtze River basin, Huaihe River basin, and southern Yellow River basin, which are defined here as the central China (CC) region. However, only a weak central Pacific (CP) El Ni?o happened during w

期刊

extreme rainfallNorthwest Pacific anticyclone anomaly (NWPAC)Indo-western Paci

On the Diurnal Cycle of Heavy Rainfall over the Sichuan Basin during 10–18 August 2020※

A sustained heavy rainfall event occurred over the Sichuan basin in southwest China during 10–18 August 2020, showing pronounced diurnal rainfall variations with nighttime peak and afternoon minimum values, except on the first day. Results show that the w

期刊

diurnal cycleheavy rainfalllow-level jetinertial oscillationterrainSichuan

Typical Circulation Patterns and Associated Mechanisms for Persistent Heavy Rainfall Events over Yan

Persistent heavy rainfall events (PHREs) over the Yangtze–Huaihe River Valley (YHRV) during 1981–2020 are classified into three types (type-A, type-B and type-C) according to pattern correlation. The characteristics of the synoptic systems for the PHREs a

期刊

persistent heavy rainfall eventsYangtze-Huaihe River ValleyRossby wave energy

TTI介质弹性波近似解耦波动方程

其他学术论文