AI 中文总结
该研究针对分布式声学传感地震模拟，引入基于加速度和应变率的公式，类似传统速度-应力框架，通过有限差分模拟验证，此公式能在复杂介质中精确产生应变率波场，无需数据转换或额外计算，更新现有理论框架和工具。
AI 中文摘要
分布式声学传感（DAS）因其具有经济高效的采集能力以及高分辨率的时空采样，在各个地震学科中越来越多地被采用。光纤电缆在高压和高温环境中具有出色的抗性，便于快速部署和长期连续监测。与传统传感器不同，光纤电缆沿电缆纵轴将地震振动记录为应变或应变率。为有效整合这种数据格式，必须调整地震波传播的控制方程。本研究引入了一种基于加速度和应变率的公式，类似于用于描述弹性波的传统速度-应力框架。由此产生的一阶耦合偏微分方程组与现有的速度和应力模型非常相似，使得当前的理论框架和计算工具只需进行最小的修改就能更新。使用有限差分模拟的数值验证证实，所提出的公式在复杂介质中产生应变率波场的精度与传统速度-应力方法相当，从而有效地消除了数据转换或额外计算的需求。
英文摘要
Distributed Acoustic Sensing (DAS) is increasingly being adopted across various seismic disciplines due to its cost-effective acquisition capabilities and its high-resolution spatial and temporal sampling. Fiber-optic cables offer exceptional resistance in high pressure and temperature environments, facilitating both rapid-deployment and long-term continuous monitoring. Unlike traditional sensors, fibre optic cables record seismic vibrations as strain or strain-rate along the cables longitudinal axis. To effectively integrate this data format, the governing equations for seismic wave propagation must be adjusted. This study introduces a formulation based on acceleration and strain-rate, analogous to the conventional velocity-stress framework used for describing elastic waves. The resulting system of first order, coupled partial differential equations closely mirrors existing velocity and stress models, allowing current theoretical frameworks and computational tools to be updated with minimal modification. Numerical validation using finite-difference simulations confirms that the proposed formulation produces strain-rate wavefields in complex media with accuracy equivalent to that of traditional velocity-stress methods, thereby effectively eliminating the requirement for data conversion or extra computations.
