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.

网络构建（1）我们用50 MHz时钟替换了微型防护仪系统的10 MHz时钟，以增加分辨率，尤其是在较高频率方面。我们还开发了一个遥测数据传输系统，该系统使我们能够通过PC当前的PC检索网络数据。（2）我们在Kanto-Tokai地区的网络每个站点中的每个站点安装了系统。，现在正在常规操作中。由于系统设计的引人注目的变化，现在可用的数据量不如最初预期的那样大。我们以1-5MHz的形式检测到从西部到东1-5MHz以60 m/s的速度传播的空气夺波波。（4）我们总结了在2007年初获得的观察结果，在希腊的一次国际会议上进行了报道，在数据分析和理论分析中，我们可以自行启动的范围，以解释启动的范围。大气，基于我们估计的无大气游离振荡的压力振幅表明检测是可行的。（2）我们分析了虹膜地震图，以表明无背景振荡的激发源在太平洋上。来源季节性移动。这些来源不仅限于浅海，但应扩展到深渊平面。（3）我们从日本的倾斜计网络数据中检测到了背景爱波。爱与雷利波的动能比大约是一个。背景波是从海洋边界中最强的，其次是从深渊平面和最弱的大陆。（4）我们开发了一种兴奋模型，将背景爱和雷利波归因于基础式波浪的地形耦合，从而有效地产生了在推定的海流水平上产生切肉应力。

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

Source distribution of Earth's background free oscillations