Collaborative research: Earthquake triggering by slow slip events beneath Kilauea's south flank

合作研究：基拉韦厄南翼下方的缓慢滑移事件引发地震

• 批准号: 0910469
• 负责人: Cecily Wolfe
• 金额: $ 13.96万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0910469&HistoricalAwards=false
• 关键词: Collaborative; research; Earthquake; triggering; slow

(a) Technical description This project involves the analysis of data from a temporary NSF-funded seismometer deployment on the south flank of Kilauea volcano, Hawaii, which we designed and deployed in anticipation of a "slow slip event" (SSE) that occurred in June 2007. The temporary seismic array recorded high levels of background seismicity as well as two swarms of flank earthquakes: one in June 2007, triggered by the expected SSE, and another in April 2007, possibly from a pore pressure change on the detachment fault beneath Kilauea's flank induced by the dynamic waves from the Mw 8.1 Solomon Islands earthquake. Our efforts involve picking and locating microearthquakes recorded on the temporary array and the USGS Hawaiian Volcano Observatory seismic network, obtaining focal mechanisms from first motion polarities, and performing double-difference tomography. We will integrate the results of our high precision study with other observations of seismicity and deformation for this region. We expect to make progress on a number of important questions regarding the tectonic framework and background seismicity patterns of Kilauea's south flank, the relation of the triggered seismic swarms to the geodetically observed SSE's, the possible existence of triggered Hilina Pali normal faulting earthquakes, and the frictional behavior of the detachment.(b) Nontechnical explanation We will study earthquakes occurring beneath the south flank of Kilauea volcano, Hawaii, taking advantage of data collected by a dense, temporary seismic array. The array was deployed in 2007 with NSF support in anticipation of a "slow slip event" (SSE) that ultimately occurred in June 2007. Our focus will be on the locations and fault geometries of earthquakes triggered by this SSE, and by a second set of earthquakes that may have been triggered by passing seismic waves from a large distant earthquake. This project is important for understanding earthquake, landslide, and tsunami hazards in Hawaii, where the style of faulting ranges from regular earthquakes to slow earthquakes to long-term creep. In particular, understanding the nature of the triggering of small earthquakes by the SSE may provide clues to the triggering of large flank earthquakes such as the damaging 1975 magnitude 7.2 Kalapana earthquake.This project was supported by the Geophysics and Marine Geology & Geophysics Programs and the Experimental Program to Stimulate Competitive Research (EPSCoR).

（a）技术描述该项目涉及分析来自临时NSF资助的地震仪的数据部署在夏威夷基拉韦阿火山的南侧，我们在2007年6月进行了“慢速滑道事件”（SSE）时设计和部署，2007年6月发生了“暂时的地震阵列”。预期的SSE，另一个在2007年4月，可能是由于MW 8.1所罗门群岛地震的动态波引起的基拉韦阿侧面的毛孔压力变化。我们的努力涉及在临时阵列和USGS夏威夷火山天文台地震网络上记录和定位的微地震，从第一次运动极性获得焦点机制，并进行双差异层造影。我们将将高精度研究的结果与该区域的地震性和变形的其他观察结果相结合。我们期望在许多重要问题上取得有关构造框架和背景地震性模式的进步夏威夷基拉韦阿火山的侧面利用了一个密集的临时地震阵列收集的数据。该阵列于2007年部署了NSF的支持，以期最终发生在2007年6月发生的“慢速事件”（SSE）。我们的重点将放在该SSE触发的地震的位置和断层几何形状，并通过第二次通过从遥远的地震传播的地震触发的地震触发的地震。该项目对于理解夏威夷地震，滑坡和海啸危害很重要，那里的断层风格从常规地震到缓慢地震到长期蠕变。特别是，了解SSE触发小地震的性质可能会为触发大型侧面地震的触发提供线索，例如1975年损害的1975年幅度7.2 Kalapana地震。