Long-Term Stability of the SIRGAS Reference Frame and Episodic Station Movements Caused by the Seismic Activity in the SIRGAS Region
Long-Term Stability of the SIRGAS Reference Frame and Episodic Station Movements Caused by the Seismic Activity in the SIRGAS Region
复制标题
SIRGAS 参考系的长期稳定性以及 SIRGAS 地区地震活动引起的阵发性台站运动
DOI：
10.1007/978-3-642-32998-2_24
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发表时间：
2013
期刊：
影响因子：
4.9
通讯作者：
S. Cimbaro
中科院分区：
文献类型：
--
作者：
L. Sánchez;W. Seemüller;H. Drewes;L. Mateo;G. González;A. Silva;J. Pampillón;W. Martínez;V. Cioce;D. Cisneros;S. Cimbaro
SIRGAS地区西部是一个地震极为活跃的地区，因为它位于太平洋、科科斯、纳斯卡、北美、加勒比和南美六个构造板块的板块边界地带。地震的频繁发生导致台站的间歇性移动，影响SIRGAS参考框架的长期稳定性。通常，通过引入新的位置和（可选）受影响台站的速度参数，在帧实现中考虑这些偶发事件。然而，这不足以保证在诸如SIRGAS的参考系中所需的高精度。有必要对基准站的震后行为进行进一步分析，以便能够在震前和震后（变形）框架之间进行精确转换。在此基础上，对SIRGAS参考框架的长期稳定性进行了评价，包括SIRGAS不同实现的比较和SIRGAS地区地震引起的台站位移分析。特别关注在阿雷基帕（2001年6月23日，男性= 8.4）和智利（2010年2月27日，男性= 8.8）发生的事件。该分析基于SIRGAS连续运行网络（SIRGAS-CON）。除了分析台站位置时间序列和估计SIRGAS参考站的位移矢量外，还制定了一些建议，以减轻使用SIRGAS作为参考框架时此类事件的影响。
The western part of the SIRGAS region is an extremely active seismic area because it is located in the plate boundary zone of six tectonic plates, namely the Pacific, Cocos, Nazca, North American, Caribbean, and South American plates. The frequent occurrence of earthquakes causes episodic station movements, which affect the long-term stability of the SIRGAS reference frame. Normally, these episodic events are taken into account in the frame realisation by introducing new position and, optionally, velocity parameters for the affected stations. However, this is not enough to guarantee the high precision required in a reference frame such as SIRGAS. Additional analyses about the post-seismic behaviour of the reference stations are necessary to allow the precise transformation between pre-seismic and post-seismic (deformed) frames. According to this, the paper presents an evaluation of the long-term stability of the SIRGAS reference frame including the comparison of the different SIRGAS realisations and the analysis of station displacements caused by earthquakes in the SIRGAS region. Special care is given to the events happened in Arequipa (on 2001-06-23, M=8.4) and Chile (on 2010-02-27, M=8.8). The analysis is based on the SIRGAS Continuously Operating Network (SIRGAS-CON). Beside analysing the station position time series and estimating the displacement vectors of the SIRGAS reference stations, some recommendations to mitigate the impact of this kind of events in the use of SIRGAS as a reference frame are formulated.