Dynamic Triggering Seen Clearly: Utilizing Continuous Waveforms and High-Resolution Catalogs to Measure the Importance and Mechanisms of Dynamic Triggering

清晰地看到动态触发：利用连续波形和高分辨率目录来衡量动态触发的重要性和机制

• 批准号: 2031457
• 负责人: Emily Brodsky
• 金额: $ 34.53万
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-06-15 至 2025-05-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2031457&HistoricalAwards=false
• 关键词: Dynamic; Triggering; Seen; Clearly; Utilizing

Every time an earthquake occurs, seismic waves emanate from it and shake the ground. Thirty years ago it was discovered that these waves can trigger other earthquakes 100’s or even 1000’s of kilometers away from the first. This phenomenon is known as dynamic triggering and it is one of the few situations where a known, measurable, natural stress can be identified as the immediate cause of an earthquake. Dynamic triggering appears to be a common and expected consequence of large earthquakes, but it remains unclear what fraction of the world’s earthquakes are caused by dynamic triggering. Is dynamic triggering an important factor in determining when and where earthquakes happen or is it a mere curiosity? The primary goal of this project is to address this question using the large datasets now available due to recent advances in computation and instrumentation. The broader impacts of this proposal include collaboration with scientists at Kyoto University in Japan, support for a graduate student and a quantification of the hazard increase expected after earthquakes in the study. The capacity to study dynamic triggering has been limited by both the ability to accurately capture the triggering stresses and the ability to record the resultant earthquakes. Significant progress has been made in both areas recently. Measuring the triggering stresses can be improved by using the full waveforms of dense networks. Recent progress in catalog generation by template matching has resulted in catalogs that have increased by an order of magnitude and, in turn, increased the detectability of rate changes. Together, these data can provide a quantitative assessment of the importance of dynamic triggering. The same data can also be used for a secondary goal of assessing the predictions of proposed mechanisms of dynamic triggering. This project will (1) measuring triggering using waveforms and a modern catalog over a wide range of frequency and orientations, (2) measuring the time-dependence of the earthquake rate change, (3) measuring rate changes as a function of cumulative energy and evaluating non-earthquake sources of seismic waves and (4) interpreting triggered seismicity rates within the context of geodetic and hydrological measurements.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

每次发生Earthqueke时，三十年前就发现波浪可以从第一个触发地震100甚至1000'sway。 ，可以将自然压力确定为地震的直接原因。地震发生的地方，还是这个项目的好奇心是为了增加Qument的使用，该Qument在日本的京都大学中使用了该科学家的更广泛的影响触发和记录最终的触发应力。触发。也可以使用相同的数据来评估动态触发的支撑机制的预测。 - 地震率变化的依赖性，（3）测量速率变化是随着地震波的非地震量的非地震而变化的，（4）解释触发的地震速率稀薄和水文学测量很薄。这奖反映了NSF的任务，并赢得了值得的高度HOROUR HOROUR HOUR HOROUR HOROUR HOROUR HOROUR HOROUR HOFROUR HORG HOROUR HORG HOROUR HORG hHOROUG HORG hHOROUG HOROUR HH使用基金会的智力优点和更广泛的影响评估标准进行评估。