Examining ambient noise using colocated measurements of rotational and translational motion
Examining ambient noise using colocated measurements of rotational and translational motion
复制标题
DOI：
10.1007/s10950-012-9288-5
复制
发表时间：
2012-10-01
影响因子：
1.6
通讯作者：
Igel, Heiner
中科院分区：
文献类型：
--
作者：
Hadziioannou, Celine;Gaebler, Peter;Igel, Heiner
在过去的十年中，许多研究报告了与地震事件有关的旋转运动的观测。我们报告的第一个观察旋转运动的微震环境噪声带。旋转运动测量的一个显著特点是，关于地震相速度和源后方位角的信息包含在旋转速率和横向加速度的点测量的振幅比中。我们调查的可能性，将这种方法应用于环境噪声测量的环形激光器和宽带地震仪在德国的Wettzell大地测量天文台。利用二次微地震带的数据，我们恢复了两个不同时间段的局部相速度以及最强噪声源的后方位角。为了证实这些发现，我们还将结果与位于附近的Grafenberg阵列的经典阵列处理技术进行了比较。
In the past decade, a number of studies have reported the observation of rotational motion associated with seismic events. We report a first observation of rotational motion in the microseismic ambient noise band. A striking feature of rotational motion measurements is that the information about the seismic phase velocity and source back azimuth is contained in the amplitude ratio of a point measurement of rotation rate and transverse acceleration. We investigate the possibility of applying this method to ambient noise measured with a ring laser and a broadband seismometer at the Wettzell Geodetic Observatory in Germany. Using data in the secondary microseismic band, we recover local phase velocities as well as the back azimuth of the strongest noise source for two different time periods. In order to confirm these findings, we additionally compare the results with classical array processing techniques of the Grafenberg array located nearby.