Seismological Investigation of Atmospheric Oscillations Excited by Volcanic Eruptions

火山喷发引起的大气振荡的地震学研究

• 批准号: 9218809
• 负责人: Hiroo Kanamori
• 金额: $ 11.99万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-04-01 至 1995-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9218809&HistoricalAwards=false
• 关键词: Seismological; Investigation; Atmospheric; Oscillations; Excited

This research is to investigate the implications of a new, unusually long (at least two hours) seismic wave train having periods of about 230 sec that was recorded at seismic stations throughout the world following the major eruption of Mount Pinatubo in the Philippines on June 15, 1991. Preliminary analysis indicates that this was a Rayleigh wave excited by atmospheric oscillations near the volcano that were set off by continuous thermal energy flux from the volcano. If this conclusion is correct, one can expect similar oscillations for other eruptions observed on the new NSF-supported Global Seismic Network (GSN). Acoustically coupled Rayleigh waves can be used for detection, characterization and quantification of major volcanic eruptions and for study of the properties of the Earth's atmosphere. A quantitative description of the source is desirable as it would allow us to estimate the amount of material injected in to the atmosphere which in turn permits us to estimate the general impact on the environment. Volcanic plumes pose a particular threat to air traffic and the seismic signal emitted by large volcanic eruptions has the potential to yield rapid estimates about the plume dimensions.

这项研究是为了调查一种新的， 异常长（至少两个小时）的地震波列， 在地震台站记录到的大约230秒的周期 皮纳图博山大喷发后，世界各地 1991年6月15日，菲律宾。 初步分析 表明这是大气激发的瑞利波 火山附近的振荡是由连续的 来自火山的热能流 如果这个结论是 正确的，人们可以预期其他爆发的类似振荡 在NSF支持的新全球地震网络（GSN）上观察到。 声耦合瑞利波可用于检测， 主要火山爆发的定性和定量， 研究地球大气层的性质 一 对来源的定量描述是可取的，因为它 使我们能够估计注入的材料量， 这反过来又使我们能够估计一般的影响 对环境的影响。 火山羽流特别威胁到 空中交通和大型火山发出的地震信号 火山爆发有可能产生快速的估计， 羽流尺寸。