| DOI: | 10.1038/ngeo2279
|
| 论文题名: | Earthquake size distribution in subduction zones linked to slab buoyancy |
| 作者: | Nishikawa T.; Ide S.
|
| 刊名: | Nature Geoscience
|
| ISSN: | 17520894
|
| 出版年: | 2014
|
| 卷: | 7, 期:12 | | 起始页码: | 904
|
| 结束页码: | 908
|
| 语种: | 英语
|
| Scopus关键词: | buoyancy
; low velocity zone
; size distribution
; slab
; subduction zone
|
| 英文摘要: | The occurrence of subduction zone earthquakes is primarily controlled by the state of stress on the interface between the subducting and overriding plates. This stress state is influenced by tectonic properties, such as the age of the subducting plate and the rate of plate motion. It is difficult to directly measure stress on a plate interface. However, the stress state can be inferred using the Gutenberg-Richter relationship's b-value, which characterizes the relative number of small compared to large earthquakes and correlates negatively with differential stress. That is, a subduction zone characterized by relatively frequent large earthquakes has a low b-value and a high stress state. The b-value for subduction zones worldwide varies significantly, but the source of this variance is unclear. Here we use the Advanced National Seismic System earthquake catalogue to estimate b-values for 88 sections in different subduction zones globally and compare the b-values with the age of the subducting plate and plate motions. The b-value correlates positively with subducting plate age, so that large earthquakes occur more frequently in subduction zones with younger slabs, but there is no correlation between b-value and plate motion. Given that younger slabs are warmer and more buoyant, we suggest that slab buoyancy is the primary control on the stress state and earthquake size distribution in subduction zones. © 2014 Macmillan Publishers Limited. |
| Citation statistics: |
|
| 资源类型: | 期刊论文
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/106480
|
| Appears in Collections: | 气候减缓与适应
科学计划与规划
|
|
There are no files associated with this item.
|
|
作者单位: | Department of Earth and Planetary Science, University of Tokyo, Hongo 7-3-1, Bunkyo, Tokyo, Japan
|
| Recommended Citation: | |
Nishikawa T.,Ide S.. Earthquake size distribution in subduction zones linked to slab buoyancy[J]. Nature Geoscience,2014-01-01,7(12)
|
|
|