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首页> 外文期刊>Seismological research letters >Misalignment Angle Correction of Borehole Seismic Sensors: The Case Study of the Collalto Seismic Network
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Misalignment Angle Correction of Borehole Seismic Sensors: The Case Study of the Collalto Seismic Network

机译：井眼地震传感器的未对准角校正：Collalto地震网络的案例研究

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摘要

One of the most critical problems affecting seismological data acquisition is related to possible misorientation of three-component seismic sensors. This generally happens when their orientation cannot be measured directly, as in the case of sensors deployed in boreholes. We describe here the sensor reorientation procedure of the Collalto Seismic Network, a microseismic monitoring network located in northeastern Italy that consists of 10 broadband three-component stations deployed in boreholes. We apply a procedure based on the misfit minimization of a complex trace recorded by a given station with respect to a reference station for which orientation is known. The main advantage of this methodology is that the reorientation of seismic sensors can be viewed as a linear inverse problem in the complex domain, which ensures that the preferred solution corresponds to the global minimum of a misfit function. Furthermore, it is also possible to simultaneously use more than one seismic event to better constrain the solution of the inverse problem. In this article, we further compare the orientation results obtained for a seismometer-seismometer sensor pair with those obtained using an accelerometer-seismometer sensor pair. We finally show the reorientation results for all the stations of the network, obtained using eight teleseismic events that occurred between January 2012 and May 2014.
机译：影响地震数据采集的最关键问题之一与三分量地震传感器可能的方向错误有关。通常在无法直接测量其方向的情况下会发生这种情况，例如部署在井眼中的传感器。我们在这里描述Collalto地震台网的传感器重新定向程序，Collalto地震台网位于意大利东北部，由10个部署在井眼中的宽带三分量站组成。我们基于给定站点相对于已知方向的参考站点所记录的复杂轨迹的失配最小化应用了一个过程。这种方法的主要优点是地震传感器的重新定向可以看作是复杂域中的线性反问题，从而确保了首选解决方案对应于失配函数的整体最小值。此外，还可以同时使用多个地震事件来更好地约束反问题的解决。在本文中，我们进一步比较了地震仪-地震仪传感器对与使用加速度计-地震仪传感器对获得的定向结果。我们最终显示了使用2012年1月至2014年5月之间发生的八次地震事件获得的网络所有站点的重新定向结果。

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