| DOI: | 10.1002/grl.50205
|
| 论文题名: | GOCE: The first seismometer in orbit around the Earth |
| 作者: | Garcia R.F.; Bruinsma S.; Lognonné P.; Doornbos E.; Cachoux F.
|
| 刊名: | Geophysical Research Letters
|
| ISSN: | 0094-9259
|
| EISSN: | 1944-8990
|
| 出版年: | 2013
|
| 卷: | 40, 期:5 | | 起始页码: | 1015
|
| 结束页码: | 1020
|
| 语种: | 英语
|
| 英文关键词: | atmospheric seismometer
; GOCE
; post-seismic infrasounds
; seismic waves
; thermosphere
; Tohoku earthquake
|
| Scopus关键词: | Frequency contents
; Future observations
; GOCE
; Infra sound
; Seismic surface wave
; thermosphere
; Tohoku earthquakes
; Vertical accelerations
; Acoustic waves
; Air
; Seismic waves
; Seismographs
; Surface waves
; Underwater acoustics
; Wavefronts
; Earthquakes
; density
; Earth
; earthquake
; seismic wave
; seismometry
; surface wave
; wave modeling
; wave velocity
; Honshu
; Japan
; Tohoku
|
| 英文摘要: | The first in situ sounding of a post-seismic infrasound wavefront is presented, using data from the GOCE mission. The atmospheric infrasounds following the great Tohoku earthquake (on 11 March 2011) induce variations of air density and vertical acceleration of the GOCE platform. These signals are detected at two positions along the GOCE orbit corresponding to a crossing and a doubling of the infrasonic wavefront created by seismic surface waves. Perturbations up to 11% of air density and 1.35 × 10- 7 m/s2 of vertical acceleration are observed and modeled with two different solid-atmosphere coupling codes. These perturbations are a due to acoustic waves creating vertical velocities up to 130 m/s. Amplitudes and arrival times of these perturbations are reproduced respectively within a factor 2, and within a 60 s time window. Waveforms present a good agreement with observed data. The vertical acceleration to air density perturbation ratio is higher for these acoustic waves than for gravity waves. Combining these two pieces of information offers a new way to distinguish between these two wave types. This new type of data is a benchmark for the models of solid-atmosphere coupling. Amplitude and frequency content constrain the infrasound attenuation related to atmosphere viscosity and thermal conductivity. Observed time shifts between data and synthetics are ascribed to lateral variations of the seismic and atmospheric sound velocities and to the influence of atmospheric winds. These effects should be included in future modeling. This validation of our modeling tools allows to specify more precisely future observation projects. © 2013. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84876805225&doi=10.1002%2fgrl.50205&partnerID=40&md5=4d3916105f028966d3617b4dcf15d01f
|
| Citation statistics: |
|
| 资源类型: | 期刊论文
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/6523
|
| Appears in Collections: | 气候减缓与适应
|
|
There are no files associated with this item.
|
|
作者单位: | Université de Toulouse, UPS-OMP, IRAP, Toulouse, France
|
| Recommended Citation: | |
Garcia R.F.,Bruinsma S.,Lognonné P.,et al. GOCE: The first seismometer in orbit around the Earth[J]. Geophysical Research Letters,2013-01-01,40(5).
|
|
|