Applications of the State-of-the-Art Seismic Analysis Methods to the Island of Hawaii

最先进的地震分析方法在夏威夷岛的应用

• 批准号: 1246935
• 负责人: Guoqing Lin
• 金额: $ 19.11万
• 依托单位: University of Miami
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1246935&HistoricalAwards=false
• 关键词: Applications; State; Art; Seismic; Analysis; Applications; State; Art; Seismic; Analysis

Hawaii is one of the most seismically active regions in the world and has been serving as a natural laboratory for studying the interactions between seismic and magmatic processes for the past few decades. We propose a two-year program to apply the state of the art seismic analysis techniques that take advantage of waveform cross-correlation to the Island of Hawaii to assess the fine-scale near-source spatial and temporal volcanic structural variations and to improve earthquake locations. The data to be used in the proposed research are the digital seismic data from the USGS Hawaiian Volcano Observatory and temporary seismic stations for about 150,000 earthquakes. The objective of this application is to integrate seismic data of Hawaii to better understand the nature of the near-source seismic parameters. In the proposed research, we will pursue the following five specific tasks to the entire Island of Hawaii: (1) to calculate both compressional and shear wave differential times by using waveform cross-correlation, (2) to image the magmatic system using the most recent tomography algorithm to a composite event data set, (3) to perform similar event cluster analysis and cross-correlation relocation, (4) to estimate high-resolution in situ Poisson's ratio using waveform data, and (5) to examine temporal variations in seismic parameters. The newly developed velocity models will be used to resolve conduits and magma chambers and to improve absolute earthquake locations. In situ Poisson's ratios with high-resolution will be of great help to track magma moving and estimate fraction of partial melt. These results will better constrain earthquake locations for a new relocation catalog based on waveform cross-correlation data. Our results will address the following questions: (1) what will the simultaneous inversions of the high-resolution three-dimensional (3-D) velocity models reveal about the magmatic system and possible magma bodies? (2) What will the absolute location constraints from 3-D velocity models tell us about the fault zones in Mauna Loa and Kilauea? (3) What will the high-resolution in situ near-source parameters estimated from waveform cross-correlation data reveal about the spatial and temporal characteristics in the near-source region? (4) How do the long-lasting seismic velocity variations in Hawaii compare to other regions? The results from this study will generate a public database of information suitable for the geology, tectonics, and volcanology communities.

夏威夷是世界上最活跃的地区之一，在过去几十年中，一直是研究地震和岩浆过程之间相互作用的自然实验室。我们提出了一项为期两年的计划，以采用最先进的地震分析技术，该技术利用波形互相关到夏威夷岛，以评估细尺度的近源空间和时间暂时的火山结构变化并改善地震位置。在拟议的研究中使用的数据是来自USGS夏威夷火山天文台和临时地震站的数字地震数据。该应用的目的是整合夏威夷的地震数据，以更好地了解近源地震参数的性质。在拟议的研究中，我们将通过使用波形互相关来计算以下五个特定任务：（1）以计算压缩和剪切波差的时间（2），（2）使用最新的断层扫描算法对岩浆系统进行图像，以进行岩浆系统，以执行相似的事件和跨境分析量（4），（4使用波形数据的比率，（5）检查地震参数的时间变化。新开发的速度模型将用于解析导管和岩浆腔，并改善绝对地震位置。原位泊松比具有高分辨率的比率将有很大的帮助，可以跟踪岩浆移动并估计部分熔体的一部分。这些结果将更好地限制基于波形互相关数据的新搬迁目录的地震位置。我们的结果将解决以下问题：（1）高分辨率三维（3-D）速度模型的同时反转揭示了有关岩浆系统和可能的岩浆物体？ （2）3-D速度模型的绝对位置约束将告诉我们Mauna Loa和Kilauea中的断层区域？ （3）从波形互相关数据估计的高分辨率原位近源参数将揭示有关近源区域的空间和时间特征的什么？ （4）与其他地区相比，夏威夷的持久地震速度变化如何？这项研究的结果将生成一个适合地质，构造学和火山学社区的信息的公共数据库。