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Measurements of Seismometer Orientation at USArray Transportable Array and Backbone Stations

机译：USArray可移动阵列和骨干站的地震仪方位测量

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Modern broadband seismometers generally have well-known and stable instrument parameters. Typically, the manufacturer's specifications indicate that the gain of each component of a three-component seismometer is known to within 1% and that the orthogonality of the components is true to within a fraction of a degree. Such precision makes possible many types of quantitative seismological analyses that were difficult with earlier instruments. In particular, different components of earlier three-component seismometers did not necessarily have the same response functions (e.g., free period of the seismometer), making any analysis based on the rotation of ground motion into the transverse and longitudinal directions difficult. Such technical problems have now largely been overcome in the most common broadband instrumentation, and it is routine to perform rotational transformations of the horizontal components of motion in modern seismological analyses, such as earthquake source investigations, S and SKS splitting studies, receiver-function determinations, and body- and surface-wave-polarization studies.
机译：现代宽带地震仪通常具有众所周知且稳定的仪器参数。通常，制造商的规格表明，三分量地震仪的每个分量的增益已知在1％以内，并且分量的正交度在几分之一以内。这种精度使得许多类型的定量地震分析成为可能，而这是早期仪器难以做到的。特别地，较早的三分量地震仪的不同分量不一定具有相同的响应函数（例如，地震仪的自由周期），这使得基于地面运动在横向和纵向上的旋转的任何分析变得困难。现在，在最常见的宽带仪器中已经大大克服了此类技术问题，并且在现代地震学分析（例如地震震源调查，S和SKS分裂研究，接收机功能确定）中，通常对运动的水平分量进行旋转变换。以及体波和表面波极化研究。

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