Test of 3C recording with 1C instruments in association with High Lava Plains field program, for crustal shear-wave velocity, anisotropy, and lithology.

这是一项 SGER 奖项，将利用先前资助的 CD 项目（高熔岩平原实验）期间的炸药爆炸。 PI 将收集高分辨率（100 m 间距，1 ms 时间采样） P ?和S？俄勒冈州东南部多个方位角的波浪剖面。 将分析数据的各向异性和 S ?波速，利用高空间分辨率。 尽管美国已经对地壳各向异性进行了一些初步观测，但通常无法确定其深度范围，因为被动观测通常是在比主动源测量低得多的频率（更粗的分辨率）下进行的。 因此，需要进行 3 分量 (3C) 有源源测量，以补充现在标准的 3C 无源源接收器功能方法。 如果 PI 取得成功，他们的结果与 CD 资助的现有爆炸源折射速度模型和接收函数图像相结合，将有助于估计岩浆侵入和地壳流在维持俄勒冈州东南部地壳厚度方面的相对作用。除了收集 CD 资助的高熔岩平原实验具有科学意义的数据外，PI 还将演示在单个地点并行使用三个单组件 (1C) 记录仪记录 3C 数据的技术可行性。 后一个目标的成功将为更充分地利用 PASSCAL 和 EarthScope Texan 记录设施、更完整地记录 NSF 资助的受控源实验产生的波形以及从未来的实验中提取更多科学结果开辟道路。 IRIS 正在安排制造 300 条线束？连接 900 个现有 1C 记录仪（德克萨斯州），每组 3 到 300 个现有 3C 4.5 Hz 地震检波器，该项目免费。

This is an SGER award which will take advantage of dynamite explosions during a previously funded CD project (the High Lava Plains Experiment). The PIs will collect high-resolution (100 m spacing, 1 ms temporal sampling) P ? and S ? wave profiles at multiple azimuths in south-eastern Oregon. The data will be analyzed for anisotropy and S ? wave velocity, utilizing the high spatial resolution. Although some preliminary observations of crustal anisotropy have been made in the USA, it has not normally been possible to localize their depth extent, because passive observations are typically made at far lower frequencies (coarser resolution) than active-source measurements. Hence the need to make 3 component (3C) active-source measurements to complement the now standard 3C passive-source receiver-function methods. If the PIs are successful, their results, in conjunction with the existing CD funded explosive-source refraction velocity model and receiver function images, will help estimate the relative roles of magmatic intrusions and crustal flow in maintaining crustal thickness in SE Oregon.In addition to collecting data of scientific interest to the CD-funded High Lava Plains Experiment, the PIs will demonstrate the technical feasibility of using three one-component (1C) recorders in parallel at a single site to record 3C data. Success in the latter aim will open a path to fuller utilization of the PASSCAL and EarthScope Texan recording facility, more complete recording of the waveforms generated by NSF-funded controlled-source experiments, and extraction of additional scientific results from future experiments. IRIS is arranging fabrication of 300 ?harnesses? to connect 900 existing 1C recorders (Texans) in groups of 3 to 300 existing 3C 4.5 Hz geophones, at no charge to this project.