Local Volcano Infrasound Monitoring
Local Volcano Infrasound Monitoring
复制标题
当地火山次声监测
DOI：
--
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Jeffrey B. Johnson
中科院分区：
文献类型：
--
作者：
Jeffrey B. Johnson
使用次声监测是为了加强对喷发动力学的了解，并随着时间的推移跟踪喷发活动。传感器位于火山附近和/或火山侧面的局部次声意味着从喷口到接收器的声音传输近似于视线。典型的假设是压力衰减为距离的倒数，衰减和弥散效应最小。因此，当地记录的信号代表相对不失真的源时间运动，并可用于有效地表征火山活动。本地监测可能需要一系列安装拓扑结构，包括火山上的单个隔离传感器、传感器网络、单个阵列或传感器阵列网络。台站可以独立安装，也可以遥测配置安装，这取决于现有资源和研究目标，其范围可以从简单的爆炸计数到脱气探测、喷口绘图或移动源识别。这些目标中的一些仅可能使用阵列。量化火山次声，在频谱形状，功率和信号包络方面，使用在本地距离记录的数据相对简单。尽管网络间的变化，潜在的源的方向性，传播效应，和/或现场响应的影响，当地次声记录允许良好的估计总声能，识别占主导地位的频谱音调，和信号形态。这些参数可以在火山处随时间进行鲁棒地比较和/或与其他火山进行比较。最后，次声分析可以对火山喷口（或斜坡）发生的活动进行远程监测，否则很难观察到这些活动。
Infrasound monitoring is employed to enhance understanding of eruption dynamics and to track eruptive activity over time. Local infrasound, where sensors are positioned near to and/or on the flanks of volcanoes, implies that sound transmission from vent to receiver is approximately line-of-sight. Typical assumptions are that pressure decays as the inverse of distance and that attenuation and dispersion effects are minimal. Locally recorded signals thus represent relatively undistorted source time motions and can be used to effectively characterize volcanic activity. Local monitoring can entail a spectrum of installation topologies including single isolated sensors on a volcano, networks of sensors, a single array, or networks of sensor arrays. Stations may be installed as standalone or in telemetered configurations depending upon available resources and research objectives, which may range from simple explosion counting to degassing detection, mapping of vents, or identification of moving sources. Some of these objectives are only possible using arrays. Quantifying volcano infrasound, in terms of both spectral shape, power, and signal envelope, is relatively straightforward using data recorded at local distances. Despite inter-network variability, influenced by potential source directivity, propagation effects, and/or site response, the local infrasound records permit good estimation of total acoustic energy, identification of dominant spectral tones, and signal morphology. These parameters may be robustly compared at a volcano over time and/or compared to other volcanoes. Ultimately, infrasound analysis permits remote surveillance of activity occurring at the vent (or on the slopes) of a volcano that may otherwise be difficult to observe.
影响因子：
5.3
作者：
Dabrowa, A. L.;Green, D. N.;Phillips, J. C.
通讯作者：
Phillips, J. C.
DOI：
10.1016/j.jvolgeores.2014.10.001
发表时间：
2014-11
影响因子：
2.9
作者：
A. Dabrowa;D. N. Green;Jeffrey B. Johnson;J. Phillips;A. Rust
通讯作者：
A. Dabrowa;D. N. Green;Jeffrey B. Johnson;J. Phillips;A. Rust