CAREER: Seismo-acoustic signatures of volcanic unrest and eruption: Local, regional, and remote

职业：火山动荡和喷发的地震声学特征：本地、区域和远程

• 批准号: 1847736
• 负责人: Robin Matoza
• 金额: $ 75万
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-06-01 至 2024-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1847736&HistoricalAwards=false
• 关键词: CAREER; Seismo; acoustic; signatures; volcanic

Seismology and acoustics are complementary geophysical methods for quantifying volcanic eruption processes and both now play a critical role in volcano monitoring and hazard mitigation. Seismic data record elastic wavefields propagating through the solid Earth, while acoustic data record acoustic wavefields propagating through the fluid atmosphere. Collectively, seismic and acoustic (seismo-acoustic) signals recorded before, during, and after eruptions inform our understanding of how volcanoes work and enable volcano monitoring scientists to forecast and assess eruptions. Seismic data currently form the backbone of most volcano-monitoring systems. Seismic signals at erupting volcanoes capture magma transport and rapid depressurization associated with explosive eruptions. Infrasound, acoustic waves with frequencies below 20 Hz, the lower-frequency limit of human hearing, is a newer technology, and provide accurate constraints on the timing and duration of explosive eruptive activity. Infrasound from major explosive eruptions can propagate for thousands of kilometers in atmospheric waveguides and infrasound sensor networks are sometimes the only ground-based technology to record an explosive eruption. This project supports a 5-year comprehensive research program on the source, propagation, and remote detection and quantification of the seismo-acoustic signatures of volcanic unrest and eruption. This research program will be integrated with a range of undergraduate and graduate educational activities at the Department of Earth Science, University of California, Santa Barbara.This project will collect next-generation, multi-parametric, seismo-acoustic field data from active volcanoes in Vanuatu, Mexico, and Chile at local (15 km), regional (15-250 km), and remote (250 km) distances from the source. In tandem, the lead researcher will develop an array of computationally intensive data processing methodologies and modeling and inversion strategies to systematically mine large volcano seismo-acoustic datasets and test multiple scientific hypotheses about the source and propagation of these wavefields. Specifically, he will investigate: (1) Acoustic source directivity of volcanic explosions; (2) Seismo-acoustic wave partitioning, conversion, and coupling; (3) Non-linear infrasound propagation; (4) The influence of topography and atmospheric structure (primarily wind and temperature) on linear and non-linear infrasound propagation from volcanic explosions; and (5) the capability of regional and remote infrasound and seismic networks to detect, locate, characterize, and catalog explosive eruptions. This work has the potential to dramatically advance the field of volcano seismo-acoustics, bridging the gap between local and regional to global scale studies. The Vanuatu field deployments will combine ground-based broadband seismic and infrasonic networks with multiple novel airborne infrasound tethered-balloon (aerostat) acquisition systems together with 3D aerial (drone) imaging and other multi-parametic data. Each geophysics field experiment team will include up to five undergraduates and two graduate students from UC Santa Barbara. The experiments will involve significant international collaboration with multiple researchers and graduate students from the US, New Zealand, Vanuatu, Mexico, and Chile. In the field, they will collect geo-referenced video data from novel 360 degree, virtual reality capable cameras, unmanned aerial vehicles, and other systems, allowing the creation of a rich immersive material for virtual field trip exercises that will share the excitement of volcano geophysics fieldwork and scientific discovery to General Education undergraduate students at UC Santa Barbara and elsewhere.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.

地震学和声学是量化火山喷发过程的补充地球物理方法，现在两者都在火山监测和减灾方面发挥着关键作用。地震数据记录通过固体地球传播的弹性波场，而声学数据记录通过流体大气传播的声波场。总的来说，在火山爆发之前，期间和之后记录的地震和声学（地震声学）信号使我们了解火山如何工作，并使火山监测科学家能够预测和评估火山爆发。地震数据目前构成了大多数火山监测系统的支柱。火山爆发时的地震信号捕捉到了与爆炸性喷发相关的岩浆输送和快速减压。次声，即频率低于20赫兹（人类听觉的低频极限）的声波，是一种较新的技术，对爆炸性喷发活动的时间和持续时间提供了准确的限制。重大爆炸性喷发产生的次声可以在大气波导中传播数千公里，次声传感器网络有时是记录爆炸性喷发的唯一地面技术。该项目支持一项为期5年的综合研究方案，研究火山动荡和喷发的地震声学特征的来源、传播、远程探测和量化。该研究项目将与加州大学圣巴巴拉分校地球科学系的一系列本科生和研究生教育活动相结合，该项目将从瓦努阿图、墨西哥和智利的活火山收集下一代多参数地震声场数据，这些活火山位于距震源15公里、15-250公里和250公里的地方。同时，首席研究员将开发一系列计算密集型数据处理方法以及建模和反演策略，以系统地挖掘大型火山地震声学数据集，并测试有关这些波场的来源和传播的多种科学假设。具体来说，他将研究：（1）火山爆发的声源方向性;（2）地震声波分离，转换和耦合;（3）非线性次声传播;（4）地形和大气结构的影响（主要是风和温度）对火山爆发产生的线性和非线性次声传播的影响;以及（5）区域和远程次声和地震网络探测、定位、表征和编目爆炸性喷发的能力。这项工作有可能大大推进火山地震声学领域，弥合地方和区域到全球尺度研究之间的差距。瓦努阿图的实地部署将把联合收割机地面宽带地震和次声网络与多个新型机载次声系留气球（浮空器）采集系统以及三维航空（无人驾驶飞机）成像和其他多参数数据结合起来。每个物理学现场实验团队将包括来自加州大学圣巴巴拉分校的最多五名本科生和两名研究生。这些实验将涉及来自美国、新西兰、瓦努阿图、墨西哥和智利的多名研究人员和研究生的重大国际合作。在该领域，他们将从新型360度、虚拟现实相机、无人机和其他系统中收集地理参考视频数据，允许创建一个丰富的沉浸式材料的虚拟实地考察演习，将分享火山物理学实地考察和科学发现的兴奋，以通识教育本科生在加州大学圣巴巴拉和其他地方。这个奖项反映了NSF的法定使命并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Investigating Spectral Distortion of Local Volcano Infrasound by Nonlinear Propagation at Sakurajima Volcano, Japan

• DOI: 10.1029/2019jb018284
• 发表时间: 2020-03
• 期刊: Journal of Geophysical Research: Solid Earth
• 作者: S. Maher;R. Matoza;C. Groot‐Hedlin;K. Gee;D. Fee;A. Yokoo

Rapid Location of Remote Volcanic Infrasound Using 3D Ray Tracing and Empirical Climatologies: Application to the 2011 Cordón Caulle and 2015 Calbuco Eruptions, Chile

使用 3D 射线追踪和经验气候学快速定位远程火山次声：在 2011 年 Cordón Caulle 和 2015 年智利卡尔布科火山喷发中的应用

• DOI: 10.1029/2022jb025735
• 发表时间: 2023
• 期刊: Journal of Geophysical Research: Solid Earth
• 作者: De Negri, Rodrigo;Matoza, Robin S.
• 通讯作者: Matoza, Robin S.

Experimental Multiblast Craters and Ejecta—Seismo‐Acoustics, Jet Characteristics, Craters, and Ejecta Deposits and Implications for Volcanic Explosions

实验性多爆炸陨石坑和喷射物——地震——声学、射流特性、陨石坑和喷射物沉积物以及对火山爆炸的影响

• DOI: 10.1029/2022jb023952
• 发表时间: 2022
• 期刊: Journal of Geophysical Research: Solid Earth
• 作者: Sonder, Ingo;Graettinger, Alison;Neilsen, Tracianne B.;Matoza, Robin S.;Taddeucci, Jacopo;Oppenheimer, Julie;Lev, Einat;Tsunematsu, Kae;Waite, Greg;Valentine, Greg A.
• 通讯作者: Valentine, Greg A.

Infrasound single-channel noise reduction: application to detection and localization of explosive volcanism in Alaska using backprojection and array processing

次声单通道降噪：使用反投影和阵列处理检测和定位阿拉斯加爆发性火山活动

• DOI: 10.1093/gji/ggac182
• 发表时间: 2022
• 期刊: Geophysical Journal International
• 影响因子: 2.8
• 作者: Sanderson, Richard W.;Matoza, Robin S.;Fee, David;Haney, Matthew M.;Lyons, John J.
• 通讯作者: Lyons, John J.

Synthetic Evaluation of Infrasonic Multipole Waveform Inversion

次声多极波形反演综合评价

• DOI: 10.1029/2021jb023223
• 发表时间: 2022
• 期刊: Journal of Geophysical Research: Solid Earth
• 作者: Iezzi, Alexandra M.;Matoza, Robin S.;Fee, David;Kim, Keehoon;Jolly, Arthur D.
• 通讯作者: Jolly, Arthur D.