2010 Fiscal Year Final Research Report
3-D seismic velocity structure with velocity discontinuities beneath the Japan Islands
| Project/Area Number |
20340119
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Solid earth and planetary physics
|
|---|
| Research Institution | Kyoto University |
|---|
Principal Investigator |
|
|---|
| Co-Investigator(Renkei-kenkyūsha) |
OHKURA Takahiro 京都大学, 大学院・理学研究科, 准教授 (40233077)
|
|---|
| Project Period (FY) |
2008 – 2010
|
| Keywords | 地震現象 / 地球内部構造 / 地震波不連続面 / レシーバ関数 / スラブ / 地震波走時トモグラフィー |
|---|
| Research Abstract |
In receiver function imaging of seismic velocity discontinuities, 1-D velocity structure is assumed to map the discontinuities, such as the top of the subducting slabs, from receiver functions. However, this procedure gives a falseimage in the cases where the slab is descending with a high dip angle. We developed a new method to map the velocity discontinuities by taking the ray bending due to the highly dipping discontinuity into account. With this method using vectorial receiver function analyses we successfully delineated 3-D image of subduction Philippine Sea slab subducting with a high dip angle beneath the Kyusyu region, south west Japan
|
