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第一份IRIS提议写于12年前,当时,在地球科学界,地震层析成象还是有争议的工具。只是最近几年才越来越清楚,早期的三维模型给出的地幔中地震速率长波长模式的影象是正确的。与诸如大地水准面、板块运动、岩石学、地球化学和地磁学方面的其他规模地球物理信息相关的关系表明波谱的这部分在解释行星尺度的运动过程时可能特别重要。这并非意味区域尺度的研究不同样重要。例如,对板块的沉降或落基山前缘的特征进行成象时,全球规模的分辨率绝不能利用临时密集布设流动地震仪所达到的分辨率同日而语。所要做的就是通过网点的局部加密,把这两种方法结合起来,努力做好这些,可能代表将来最有前途的发展。全球地震台网(GSN)和大陆岩石层地震台阵(PASSCAL)作为IRIS的两个组成部分都将在这方面作出贡献。下面我们将在4个方面对层析成象的成果对整个深部范围:从地壳到内核进行简要的综述,只有一个例外,其余结果不仅根据来自IRIS GSN台站记录的数据,而且根据其他数字地震台网联合会(FDSN)台网:GEOSCOPE,CDSN,MedNet记录的数据得到的。显然,这些台站的存在正改变着地震学研究方式。
The first IRIS proposal was written 12 years ago, when seismic tomography was still a controversial tool in the earth science community. It is only in recent years that it became clear that the early three-dimensional model gave the correct image of the long-wavelength mode of seismic velocity in the mantle. Relationships with other-scale geophysical information, such as geoid, plate movement, petrology, geochemistry and geomagnetism, indicate that this part of the spectrum may be of particular importance in explaining the planetary scale motion. This does not mean that regional studies are not as important. For example, when imaging plate subsidence or rocky mount front features, the resolution at a global scale must not be the same as the resolution achieved by a temporary densely distributed mobile seismometer. All that has to be done is to combine these two approaches through local encryption of outlets, and working hard to do that may represent the most promising development in the future. The Global Seismic Network (GSN) and the Continental Rock Seismic Array (PASSCAL), both of which are part of IRIS, will contribute in this regard. In the following we will review the results of tomosynthesis over the entire deep range in four areas: a brief overview from the crust to the core, with one exception, and the remaining results not only based on data recorded from the IRIS GSN station but also from other digital earthquakes Taiwan Network Association (FDSN) network: GEOSCOPE, CDSN, MedNet recorded data obtained. Obviously, the existence of these stations is changing the way seismology research.