DOI: 10.1002/grl.50826
论文题名: Scattered waves from low-frequency earthquakes and plate boundary structure in northern Cascadia
作者: Nowack R.L. ; Bostock M.G.
刊名: Geophysical Research Letters
ISSN: 0094-8638
EISSN: 1944-8369
出版年: 2013
卷: 40, 期: 16 起始页码: 4238
结束页码: 4243
语种: 英语
英文关键词: Body Waves
; Seismology
; Subduction Zones
Scopus关键词: Body waves
; Crustal velocity
; Low-frequency earthquakes
; Low-velocity zone
; Plate boundaries
; Plate boundary models
; Subduction zones
; Waveform modeling
; Earthquakes
; Scattering
; Seismology
; Three dimensional
; earthquake epicenter
; frequency analysis
; heterogeneity
; plate boundary
; scattering
; seismology
; subduction zone
; thrust
; wave
; Cascadia Basin
; Pacific Ocean
英文摘要: We use 3-D waveform modeling of LFEs (low-frequency earthquakes) to investigate their relation to plate boundary structure along a linear transect in northern Cascadia. To account for crustal velocity heterogeneity, a smoothed 3-D model of subduction zone structure is assembled that incorporates constraints from regional tomographic and plate boundary models. Scattered phases within LFE waveforms are identified based on synthetic predictions that incorporate thrust mechanisms aligned parallel to a dipping plate boundary atop a high-Vp/Vs low-velocity zone (LVZ). Scattering for near-vertical paths is dominated by S-to-P/S-to-S reflections/conversions from the LVZ. The modeling suggests that LFEs lie at or very close to the plate boundary and that the LVZ structure is laterally heterogeneous but broadly consistent with results from teleseismic analysis. Key Points LFE templates are used to constrain plate boundary structure LFE waveforms controlled by focal mechanisms and S-P and S-S scattering Modeling of LFE waveforms broadly consistent with teleseismic estimates. © 2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84883122063&doi=10.1002%2fgrl.50826&partnerID=40&md5=e42ff16115333d3e6cd3dee841cb183c
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5902
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, 550 Stadium Mall Dr., West Lafayette, IN 47907, United States
Recommended Citation:
Nowack R.L.,Bostock M.G.. Scattered waves from low-frequency earthquakes and plate boundary structure in northern Cascadia[J]. Geophysical Research Letters,2013-01-01,40(16).