Acquisition and Operation of Broadband Seismograph Equipment at Chilean Bases in the Antarctic Peninsula Region

该奖项由极地方案办公室南极地质和地球物理方案联合提供，支持将南极半岛的三台临时地震仪改造成半永久地震台并继续利用这些数据进行基础研究的研究。在1997年和1998年期间，在南极半岛地区和智利最南端的巴塔哥尼亚安装和维护了11台宽带地震仪网络。该项目的数据回报一直很好，并产生了有趣的初步结果。在较长时间内继续使用这些仪器将是非常有益的，因为较大震级区域地震的数量很少，因此需要较长时间才能获得数据。然而，该项目的仪器是从IRIS-PASSCAL仪器池借来的，必须在1999年4月归还给PASSCAL。这项奖励提供资金，将智利在南极的永久基地的三个台站改为永久台站，并继续对该地区进行为期四年的地震调查。作为该项目的一部分，位于智利巴塔哥尼亚的第四个站将继续使用华盛顿大学的设备运行。该项目的资金将使华盛顿大学和智利大学在这些台站的运营方面继续合作，数据将被转发给IRIS数据中心以及其他国际地震学合作者。与具有南极地震学研究计划的其他国家小组进行的相互数据交换将提供对该地区其他各种专有宽带站的宽带数据的访问。这些资料将被用来研究该地区几个复杂构造区的地震活动和上地幔速度结构，包括南设得兰俯冲带、布兰斯菲尔德弧后裂谷和巴塔哥尼亚、德雷克海峡和南斯科舍岭沿线的扩散板块边界。特别是，这些台站在较长时间内的运行将使人们能够更好地了解南设得兰海沟的地震活动，这是一个不寻常的俯冲带，显示出年轻岩石圈的非常缓慢的俯冲。德克萨斯大学计划于2000年4月在布兰斯菲尔德海峡进行一次地球物理巡航，这些地震仪还将被用来记录气枪射击。这些数据将提供对台下地壳结构的重要制约，改进的结构模型将能够执行更精确的地震定位程序，以支持对该地区的地震学了解。

This award, provided jointly by the Antarctic Geology and Geophysics Program of the Office of Polar Programs, supports research to transform three temporary seismometers in the Antarctic Peninsula into semi-permanent stations and to continue basic research using these data. During 1997 and 1998, a network of 11 broadband seismographs in the Antarctic Peninsula region and southernmost Chilean Patagonia were installed and maintained. Data return from this project has been excellent and interesting initial results have been produced. The continued operation of these instruments over a longer time period would be highly beneficial because the number of larger magnitude regional earthquakes is small and so a longer time is needed to acquire data. However, instruments from this project are borrowed from the IRIS-PASSCAL instrument pool and must be returned to PASSCAL in April, 1999. This award provides funds to convert three stations at permanent Chilean bases in the Antarctic to permanent stations, and to continue the seismological investigation of the region for a period of four years. As part of this project, a fourth station, in Chilean Patagonia, will continue to be operated using Washington University equipment. The funding of this project will enable continued collaboration between Washington University and the Universidad de Chile in the operation of these stations, and the data will be forwarded to the IRIS data center as well as to other international seismological collaborators. Mutual data exchanges with other national groups with Antarctic seismology research programs will provide access to broadband data from a variety of other proprietary broadband stations in the region. The data will be used to study the seismicity and upper mantle velocity structure of several complicated tectonic regions in the area, including the South Shetland subduction zone, the Bransfield backarc rift, and diffuse plate boundaries in Patagonia, Drake Passage, and along the South Scotia Ridge. In particular, the operation of these stations over a longer time period will allow a better understanding of the seismicity of the South Shetland Trench, an unusual subduction zone showing very slow subduction of young lithosphere. These seismometers will also be used to record airgun shots during a geophysical cruise in the Bransfield Strait that is being planned by the University of Texas for April, 2000. These data will provide important constraints on the crustal structure beneath the stations, and the improved structural models will enable implementation of more precise earthquake location procedures in support of a seismological understanding of the region.