项目名称: 基于三维速度模型的多尺度有限频远震体波走时层析成像研究及其应用
项目编号: No.41304066
项目类型: 青年科学基金项目
立项/批准年度: 2014
项目学科: 天文学、地球科学
项目作者: 张风雪
作者单位: 中国地震局地球物理研究所
项目金额: 25万元
中文摘要: 针对地震波频带的有限性,近年兴起了有限频体波走时层析成像,建立了不同频段内走时残差和速度异常间更为真实的对应关系。但在实际应用中,一般只将一维初始速度模型在各个频段的观测数据中进行单次反演,使成像结果过于依赖初始速度模型。本申请拟通过求解三维速度介质中的灵敏度算核,实现基于三维速度模型的多尺度有限频远震体波走时层析成像,并依前人已在中国东北地区所取得的研究共识检验本申请拟发展方法的实用性和可靠性。
中文关键词: 有限频;层析成像;多尺度;;
英文摘要: Considering the finite-frequency of seismic waves, finite-frequency body-wave traveltime tomography was introduced in recent years. A more accurate correspondence, between traveltime residuals and velocity anomalies at different frequency band, was established by finite-frequency traveltime tomography. However, in the actual applications, there is generally one single inversion for 1-D initial velocity model according to the each band observational data. The tomography results are too dependent to the initial model. In this application we want to achieve the multi-scale finite-frequency tomography based on the 3-D velocity model by calculating the sensitive kernel in 3-D velocity medium. We can use the research consensus, which are got by other researcher's study in the Northeast China, to test the new method's practicality and reliability.
英文关键词: Finite-frequency;Tomography;Multi-scale;;