Collaborative Research: Acquisition of GPS and seismic equipment for Phase 2 of a Plate Boundary Observatory, Nicoya Peninsula, Costa Rica

合作研究：为哥斯达黎加尼科亚半岛板块边界观测站第二阶段采购 GPS 和地震设备

• 批准号: 1140261
• 负责人: Timothy Dixon
• 金额: $ 3.09万
• 依托单位: University of South Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-06-01 至 2013-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1140261&HistoricalAwards=false
• 关键词: Collaborative; Research; Acquisition; GPS; seismic

This grant supports a collaborative effort between the University of Miami ? RSMAS (PI: Tim Dixon), the University of California Santa Cruz (PI: Susan Schwartz), UNAVCO and Costa Rican colleague Dr. Marino Protti at OVSICORI to acquire and deploy GPS and seismic equipment on the Nicoya Peninsula, Costa Rica. Observation from this network will directly feed into research efforts supported by the Margins Program (OCE-0841091/Miami-RSMAS/Dixon and OCE-0841091/UCSC/Schwartz). This grant will facilitate an augmentation and upgrade to a current but smaller network of GPS and seismic instrumentation on the Nicoya Peninsula, Costa Rica (funded through EAR- 0502221). The end result will be extended and better constrained geophysical observations in time and space beyond that now being acquired.This support will add an additional seven GPS sites and upgrade five of the older existing thirteen GPS sites to PBO standards as well as allow for the purchase and installation of four Guralp CMG3 broadband seismic sensors and associated data loggers to replace equipment in the current Nicoya seismic network that are currently on loan. Data from the network will continue to flow to the UNAVCO and IRIS publicly accessible data archives. The existing Nicoya seismogeodetic network has recorded initial evidence of aseismic slip of the downgoing slab and associated nonvolcanic tremor in May 2007. This expansion of the Nicoya GPS and seismic network will better constrain the time varying strain field and seismic activity. Similar albeit higher resolution space-time observations of subduction zone dynamics within the Cascadia and SW Japan subduction zones have radically changed and challenged our understanding of plate tectonic processes at subduction zones with implications for better understanding seismic hazards. This expansion of the Nicoya Plate Boundary Observatory (PBO) will allow for study of a class of subduction zone with different properties from those of the Cascadia and Japan trenches, perhaps most importantly, temperature/age of the downgoing slab. The Nicoya Peninsula is unique in that it is perched almost directly over the locked part of the plate boundary. As a result, the proposed geophysical observatory will enable high signal/noise (S/N) ratio observations of plate boundary processes. Questions to be addressed by the data collected by these instruments include: 1) What is the relationship between slow slip, nonvolcanic tremor, strain accumulation and interplate earthquakes. 2) What is the role of temperature and fluids in tremor and slip generation? 3) Is the occurrence of fast and slow slip tremor spatially and/or temporally separated? The answers to these questions have important implications for understanding the seismic process at subduction zones.Broader impacts will include international cooperation and technology transfer, graduate student training with state-of-the-art seismic and geodetic instrumentation and techniques, and improved understanding of earthquake hazards in the region.

这项赠款支持迈阿密大学之间的合作努力？ RSMA（PI：Tim Dixon），加利福尼亚州圣克鲁斯分校（PI：Susan Schwartz），Unavco和Costa Rican同事Marino Protti博士Marino Protti博士Marino Protti博士在Costa Rica的Nicoya Peninsula上收购和部署GPS，以及在Nicoya Peninsine的GPS和地震设备。 该网络的观察将直接介入Margins计划支持的研究工作（OCE-0841091/Miami-Rsmas/Dixon和OCE-0841091/UCSC/Schwartz）。 这项赠款将促进增强，并升级到哥斯达黎加的尼科亚半岛（Nicoya Peninsula）的当前但较小的GPS网络和地震仪器网络（通过EAR-0502221资助）。 最终结果将扩大，并在现在获得的时间和空间上进行更大的限制地球物理观察结果。此支持将增加七个GPS网站，并升级五个较旧的现有13个GPS网站中的五个，以及允许购买和安装四个Guralp CMG3 Broad Blox Seemic and Innice NIC的设备，并允许购买和安装四个Guralp CMG3 Broad Broad Seement nick Seey An Nice Anice An Nice Seey。 来自网络的数据将继续流向UNAVCO和IRIS公共访问的数据档案。 现有的尼科亚（Nicoya）地震地理网络已记录了2007年5月的下板板和相关的非沃尔卡尼克震颤的无性滑移的初步证据。尼科亚GPS的这种扩展和地震网络的扩展将更好地限制时间变化的应变场和地震活性的时间。 尽管在Cascadia和SW日本俯冲区域内对俯冲区动力学的较高分辨率时空观测已经发生了根本性的改变，并挑战了我们对俯冲区域板块构造过程的理解，对更好地理解地震危害的影响。 尼科亚板板边界观测站（PBO）的这种扩展将允许研究具有与卡斯卡迪亚和日本沟槽不同的俯冲区，也许最重要的是，可能是最重要的是，是下板的温度/年龄。 尼科亚半岛的独特之处在于它几乎直接栖息在板块边界的锁定部分上。 结果，所提出的地球物理观测站将使板边界过程的高信号/噪声（S/N）比率观测。 这些工具收集的数据要解决的问题包括：1）慢滑，非沃尔底克震颤，应变积累和板间地震之间的关系是什么？ 2）温度和流体在震颤和滑动产生中的作用是什么？ 3）在空间上和/或时间分离的快速和缓慢滑动的发生？这些问题的答案对理解俯冲区的地震过程具有重要意义。Broader的影响将包括国际合作和技术转移，研究生的研究生培训，并进行最先进的地震和地球仪器和技术和技术，以及对该地区地震危害的了解。