GEOSCOPE: A French initiative in long‐period three‐component global seismic networks
GEOSCOPE: A French initiative in long‐period three‐component global seismic networks
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GEOSCOPE：法国长期三分量全球地震网络倡议
DOI：
10.1029/eo065i042p00753-01
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发表时间：
1984
期刊：
影响因子：
--
通讯作者：
D. Rouland
中科院分区：
文献类型：
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作者：
B. Romanowicz;M. Cara;Jean François Fel;D. Rouland
过去几年来，由于世界各地校准良好的仪器提供了数字数据，长周期地震学取得了相当大的进展。非常长时期的国际加速度计部署（IDA）网络[Agnew等人，1976]提供了许多关于地球结构和震源研究的新测量，并证明了稀疏全球数字网络的有用性。宽带全球数字地震网（GDSN）网络提供了获取大量数据的机会，这些数据的利用可以很容易地实现自动化。
然而，这两个网络都有其缺点，现在许多美国科学家希望开发一个新的全球数字网络，更好地适应目前的地球物理研究的要求。在很长的周期域（周期从大约100秒到1小时），IDA网络只记录地面运动的垂直分量，使得来自地球的水平激发模式的信息不可用。它也饱和的第一个瑞利波列从最大的地震，造成损失的数据直接源站的路径，令人遗憾的源和结构的研究。GDSN网络存在一些非线性问题，最重要的是，仪器响应不足以满足地震学家目前的需求：地震研究观测站（SRO）网络[Peterson和Orsini，1976]是GDSN的主要组成部分，主要用于区分地震和核爆炸。
Progress in long-period seismology has been considerable in the past few years, owing to the availability of digital data from well-calibrated worldwide instruments. The very long period International Deployment of Accelerometers (IDA) network [Agnew et al., 1976] has provided many new measurements concerning both earth structure and seismic source studies and demonstrated the usefulness of sparse global digital networks. The broadband Global Digital Seismographic Network (GDSN) network has given access to a large quantity of data whose exploitation can be readily automatized.
Both networks have their shortcomings, however, now expressed in the desire of many U.S. scientists to develop a new global digital network better adapted to present requirements of geophysical research. In the very long period domain (periods from about 100s to 1 hour), the IDA network only records the vertical component of ground motion, making information from horizontally excited modes of the earth unavailable. It also saturates the first Rayleigh wave trains from the largest earthquakes, causing a loss of data on direct source station paths, regrettable both for source and structure studies. The GDSN network suffers from some nonlinearity problems and, above all, the inadequacy of instrument responses for present needs of seismologists: The Seismic Research Observatories (SRO) network [Peterson and Orsini, 1976], which is the main constituent of GDSN, was designed mainly for discrimination between earthquakes and nuclear explosions.