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Observation of Earth's free oscillation by dense GPS array: After the 2011 Tohoku megathrust earthquake
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| Title: | Observation of Earth's free oscillation by dense GPS array: After the 2011 Tohoku megathrust earthquake |
| Authors: | Mitsui, Yuta Browse this author →KAKEN DB | | Heki, Kosuke Browse this author →KAKEN DB |
| Issue Date: | 5-Dec-2012 |
| Publisher: | Nature Publishing Group |
| Journal Title: | Scientific Reports |
| Volume: | 2 |
| Issue: | 931 |
| Start Page: | 1 |
| End Page: | 4 |
| Publisher DOI: | 10.1038/srep00931 |
| Abstract: | Day-scale Earth’s free oscillation after large earthquakes has been detected by underground instruments such as strainmeters, gravimeters and seismometers, to investigate Earth’s internal structure, geodynamics, and source properties of earthquakes. Here we show that Global Positioning System (GPS) can also detect the signals of the Earth’s free oscillation. A dense GPS array in Japan (GEONET) recorded the surface deformation following the 2011 Tohoku megathrust earthquake. A simple array analysis over 300 stations reduces local noise in GPS time series. We find that the dense GPS array truly detected both spheroidal and toroidal fundamental modes in three-direction displacement. This new tool has a strong potential to investigate the free oscillations particularly in low-frequency bands. |
| Rights: | http://creativecommons.org/licenses/by-nc-nd/3.0/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/50955 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 日置 幸介
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