| 项目编号: | 1520081
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| 项目名称: | Using Dense Seismic Arrays to Determine Structure in the Los Angeles Basin |
| 作者: | Robert Clayton
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| 承担单位: | California Institute of Technology
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| 批准年: | 2014
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| 开始日期: | 2015-11-01
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| 结束日期: | 2018-10-31
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| 资助金额: | USD261587
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| 资助来源: | US-NSF
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| 项目类别: | Continuing grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Geosciences - Earth Sciences
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| 英文关键词: | oil-company
; los angeles basin
; basin
; subsurface structure
; central basin
; los angeles region
; subsurface velocity structure
; los angeles
; small-aperture sub-array
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| 英文摘要: | With this study we plan to combine seismic data from oil-company surveys with the earthquake seismic data from the Southern California Seismic Network to determine the velocity in the top 1-3 km of the surface in the Los Angeles Basin. This information is important because it directly bears on the level of shaking that can be expected from earthquakes due to the variations soils and subsurface structures. It will be used along with actual measurements of ground shaking to determine maps of seismic hazard for the central part of the Los Angeles Basin. In addition, we will use the dense coverage provided by the oil-company surveys to determine the micro-earthquake activity in the basin. This is important for understanding the physical process that generates the earthquakes in Los Angeles.
The subsurface velocity structure will be determined by surface waves and refracted body waves. These waves will be extracted from the ambient noise field by cross-correlation of the oil-company and earthquake-monitoring data. The source that generates these waves is ocean microseisms, and hence is always present. The correlations will be done over many days and will use small-aperture sub-arrays to minimize the background noise. The result will be a map of the near-surface shear and compressional wave velocities for the central basin, where the ray coverage is the densest. The near-surface velocities will then be added to the reference model of the Los Angeles region (SCEC velocity model) to make a complete velocity model that can be used to simulated earthquake-generated wave in the basin. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/93101
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| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
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| Recommended Citation: | |
Robert Clayton. Using Dense Seismic Arrays to Determine Structure in the Los Angeles Basin. 2014-01-01.
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