| 项目编号: | 1546636
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| 项目名称: | Collaborative Research: The Nepal Earthquake and Limits on Moment, Fault Geometry and Time Dependent Stress Changes |
| 作者: | Roger Bilham
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| 承担单位: | University of Colorado at Boulder
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| 批准年: | 2014
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| 开始日期: | 2015-06-15
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| 结束日期: | 2017-05-31
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| 资助金额: | USD27720
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| 资助来源: | US-NSF
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| 项目类别: | Standard 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: | earthquake
; stress
; kathmandu
; investigator
; san andreas fault
; future earthquake
; recent himalayan earthquake
; collaborative rapid project
; nepali student
; nepal earthquake
; previous similar earthquake
; time-sensitive intensity datum
; historical earthquake
; future major earthquake
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| 英文摘要: | The M7.8 earthquake occurred on 25 April 2015 in Nepal is unique among recent Himalayan earthquakes, as it failed to release entirely the pent up stress accumulated since a previous similar earthquake there in 1833. Instead, stress was transferred from 40 km north of the capital, Kathmandu, to 8 km to the south, shifting the 2 million population of the Kathmandu Valley about 1.3 m to the southwest in the process. Of major concern is that this stress is now poised, either to diffuse benignly as slow slip, or to be released violently in a future Mw≤7.5 earthquake. US Embassy officials in Kathmandu are concerned that a major aftershock of this size occurring on the outskirts of the capital would have catastrophic consequences to the already weakened buildings of the city, and would greatly impair the rescue operation to the thousands of villages wiped out by the April 25, 2015 earthquake. In this collaborative rapid project, the investigators will install instruments in the region south of Kathmandu to identify what is exactly happening to this stress. The hope is that processes similar to those occurring on the San Andreas fault in California prevail, namely that stress are being released slowly, in which case it would be possible to infer that a future major earthquake is unlikely. The investigators also recognize that the 2015 earthquake may provide clues to future earthquakes near Kathmandu, in that it may be possible to gain insights into what may happen next by re-evaluating historical earthquakes occurred near Kathmandu in the period from 1833 to 1866. The investigators will be collaborating with Nepali students and faculty in Tribhuvan University to undertake these studies.
The investigators plan to install two arrays of GPS units on stable monuments between Kathmandu and the frontal thrusts of the Himalaya- a 35 km wide distance with instrument spacing as close as 5 km. The narrow spacing will permit them to detect slip of the Himalayan décollement should it be occurring, and will permit them to distinguish various forms of spatial strain diffusion, or locally locked asperities should these exist. Data from each instrument will be telemetered to Boulder and the data will be processed daily and archived with easy public access. A number of campaign GPS sites will be also installed that will be measured at six-month intervals (or more frequently) by students from Tribhuvan University. The investigators envisage that up to eleven additional GPS instruments will be deployed. The investigators plan also to gather time-sensitive intensity data from the epicentral region that may be used to calibrate the attenuation of surface acceleration in the 2015 earthquake. They will use these data to calibrate historical intensity data from the 1833, 1835, 1866,1934 and 1936 Nepal earthquakes, that will used to constrain the rupture areas of these former events, and how they relate to the 2015 earthquake. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/94353
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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: | |
Roger Bilham. Collaborative Research: The Nepal Earthquake and Limits on Moment, Fault Geometry and Time Dependent Stress Changes. 2014-01-01.
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