DOI: 10.1016/j.tecto.2019.228308
论文题名: Crustal thickness and bulk Poisson ratios in the Dominican Republic from receiver function analysis
作者: Kumar S. ; Agrawal M. ; Pulliam J. ; Rivera E.P. ; Huérfano V.A.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 775 语种: 英语
中文关键词: Crustal structure
; Dominican Republic
; Hispaniola
; Receiver functions (RF)
英文关键词: Seismology
; Stratigraphy
; Crustal structure
; Crustal thickness
; Dominican Republic
; Hispaniola
; North american plates
; Receiver function analysis
; Receiver functions
; Shallow structure
; Structural geology
; broadband data
; crustal thickness
; lower crust
; Poisson ratio
; seismic data
; seismograph
; stacking
; upper mantle
; Hispaniola
; Cana
英文摘要: The Dominican Republic (DR) comprises the eastern two-thirds of the island of Hispaniola, which is located on the Caribbean-North American plate boundary. Previous studies have described the shallow structure and stratigraphy of the island but, due to a dearth of broadband seismic data, little is known about the lower crust and mantle. Since August 2014, thirteen broadband, three-component seismic stations have been deployed temporarily in the DR. They are combined with four permanent broadband stations in the DR and three in neighboring Haiti to enhance studies of Hispaniola's lower crust and upper mantle. We report results of a receiver function study using teleseismic data recorded by these stations. Specifically, we compute receiver functions and determine crustal properties via H-κ stacking. We propose additional intracrustal and upper mantle layers based on identifications of prominent and coherent P-to-S converted phases observed in receiver function gathers. Our results show that crustal thickness varies beneath the island of Hispaniola over the range 13–47 km with a median of 24 km and bulk Vp/Vs ratios vary over 1.58–1.99 with median 1.79. Receiver function modeling reveals intracrustal discontinuities at station PAPH (Port au Prince, Haiti), at a depth of 8.0 km, station JIDR (Jimaní, DR; 8.8 km depth), and SDDR (Sabaneta, DR; 15.8 km depth). Additional discontinuities appear in the upper mantle beneath PAPH (60.1 km depth), PCDR (Punta Cana; 60 km), SDD (Santo Domingo; 70 km), and SC01 (Santiago; 81 km). Two north-south cross-sections show variations in bulk Vp/Vs ratios that are consistent with expectations based upon surface geology but variations in crustal thickness are more scattered and do not conform to expectations from simple tectonic models of Hispaniola's formation. Our stacking results reveal consistency between Vp/Vs ratios in four distinct regions which are consistent with the compositional domains identified by previous studies. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170632
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Indian Institute of Technology (Indian School of Mines), Dhanbad, India; Baylor University, Waco, TX, United States; National Center of Seismology, Autonomous University of Santo Domingo, Santo Domingo, Dominican Republic; Puerto Rico Seismic Network, Mayagüez, PR, United States
Recommended Citation:
Kumar S.,Agrawal M.,Pulliam J.,et al. Crustal thickness and bulk Poisson ratios in the Dominican Republic from receiver function analysis[J]. Tectonophysics,2020-01-01,775