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An attempt to detect atmospheric free oscillations by a new array deployment of micro-barometers

尝试通过新的微气压计阵列部署来检测大气自由振荡

基本信息

批准号：
17340135
负责人：
FUKAO Yoshio
金额：
$ 10.37万
依托单位：
Japan Agency for Marine-Earth Science and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17340135/
关键词：
Earth's free oscillations air pressure observation atmospheric free oscillations aero-acoustic waves

项目摘要

Network Construction(1) We replaced a 10 MHz clock of our micro-barometer system with a 50 MHz clock to increase resolution especially on a higher frequency side. We also developed a telemeter data-transmission system which enabled us to retrieve network data by PC at hand.(2) We installed the system at each of 14 stations of our network in the Kanto-Tokai districts. , which is now in routine operation. The amount of the data now available is not as large as originally anticipated because of the compelling change of the system design.(3) We examined the noise spectrum of air pressure fluctuation at each station and found a strange behavior of aero-acoustic tremor. We detected aero-gravity waves at 1-5mHz propagating from the west to east at a speed of 60 m/s.(4) We summarized the observational results obtained by the beginning of 2007, which were reported at an international conference in Greece.Results from Data Analyses and Theoretical Analyses(1) We developed an excitation model that can explain the observed resonance phenomenon of free oscillations between the solid Earth and the atmosphere, based on which we estimated the pressure amplitudes of atmospheric free oscillations to show that the detection is feasible.(2) We analyzed the IRIS seismograms to show that the excitation source of background free oscillations lies in the Pacific. The source moves seasonally. The sources are not limited to shallow seas but should extend to abyssal planes.(3) We detected background Love waves from tiltmeter network data in Japan. Kinetic energy ratio of Love to Rayleigh waves is approximately one. The background waves are strongest from ocean-continent borders, next from abyssal planes and weakest from continents.(4) We developed an excitation model attributing background Love and Rayleigh waves to topographic coupling of infragravity waves that effectively generates tangential stress acting on the presumed seafloor horizon.

网络建设(1)我们用50 MHz时钟取代了我们的微型气压计系统的10 MHz时钟，以提高分辨率，特别是在较高频率端。我们还开发了一种遥测数据传输系统，使我们能够通过手头的PC检索网络数据。(2)我们在关东东海地区的14个网络站点中的每个站点都安装了该系统。，现已投入常规运营。由于系统设计的强制性变化，目前可获得的数据量并不像最初预期的那么大。(3)我们检查了每个站的气压波动噪声谱，发现了气声颤振的奇怪行为。我们探测到了以60m/S的速度从西向东传播的1-5 MHz的空气重力波。(4)总结了2007年初在希腊举行的一次国际会议上报道的观测结果。结果(1)我们建立了一个激发模型，可以解释观测到的固体地球和大气之间的自由振荡共振现象，并在此基础上估计了大气自由振荡的压力幅度，表明该探测是可行的。(2)通过对IRIS地震图的分析，表明背景自由振荡的激发源在太平洋。源头是季节性移动的。震源不仅限于浅海，还应延伸到深海平面。(3)利用日本的倾斜仪台网数据探测到背景乐夫波。Love与Rayleigh波的动能比约为1。背景波在洋陆交界处最强，其次是深海平面，最弱来自大陆。(4)我们建立了一个激励模型，将背景Love波和Rayleigh波归因于次重力波的地形耦合，这种耦合有效地产生了作用于假定海底层位的切向应力。

项目成果

期刊论文数量（0）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Array observation of background atmospheric waves in the seismic band form 1mHz to 0.5Hz

1mHz至0.5Hz地震频带背景大气波阵列观测

DOI：
发表时间：
2005
期刊：
Geophysical journal International 162
影响因子：
0
作者：
N.Nishida;Y.fukao;S.Watada;N.Kobayashi;M.Tahira;N.Suda;K.Nawa;T.Oi;T.Kitajima
通讯作者：
T.Kitajima

Infrasounds and background free oscillations

次声波和无背景振荡