Kent, Graham M. et al. (1997): Evidence from Hole 504B for the origin of dipping events in oceanic crustal reflection profiles as out-of-plane scattering from basement topography
Leg/Site/Hole:
Related Expeditions:
ODP 111 ODP 137 ODP 140 ODP 148 DSDP 69 DSDP 70 DSDP 83 DSDP 92 DSDP 69 504 DSDP 70 504 DSDP 83 504 DSDP 92 504 ODP 111 504 ODP 137 504 ODP 140 504 ODP 148 504
Identifier:
ID:
1997-020217
Type:
georefid
ID:
10.1130/0091-7613(1997)025<0131:EFHFTO>2.3.CO;2
Type:
doi
Creator:
Name:
Kent, Graham M.
Affiliation:
Woods Hole Oceanographic Institution, Woods Hole, MA, United States
Role:
author
Name:
Detrick, Robert S.
Affiliation:
Scripps Institution of Oceanography, La Jolla, CA, United States
Role:
author
Name:
Swift, Stephen A.
Affiliation:
Role:
author
Name:
Collins, John A.
Affiliation:
Role:
author
Name:
Kim, Isaac I.
Affiliation:
Role:
author
Identification:
Title:
Evidence from Hole 504B for the origin of dipping events in oceanic crustal reflection profiles as out-of-plane scattering from basement topography
Year:
1997
Source:
Geology (Boulder)
Publisher:
Geological Society of America (GSA), Boulder, CO, United States
Volume:
25
Issue:
2
Pages:
131-134
Abstract:
Dipping reflectors in oceanic crustal seismic reflection profiles have been attributed to either faults cutting through the crustal section or magmatic layering in the mid- to lower crust. Using closely spaced (<1 km) single-channel seismic and multichannel seismic profiles collected near Ocean Drilling Program Hole 504B, we show that a conspicuous dipping event previously interpreted as a low-angle fault striking perpendicular to the ridge axis is actually a scattering artifact from an approximately 80-m-high, sediment-buried basement fault scarp located approximately 2 km south of Hole 504B. The interplay between the orientation of the profile relative to basement topography and the streamer feathering angle can significantly increase the moveout of scattered energy above the sediment-basement root-mean-square velocity, allowing these scattered events to stack coherently at crustal velocities. These results suggest that in many cases dipping events imaged in oceanic crustal reflection profiles may be scattering artifacts rather than real geologic features.
Language:
English
Genre:
Serial
Rights:
URL:
Coverage: Geographic coordinates: North:1.1600 West:-83.5000 East:
-83.3500 South:1.0900
Keywords: Solid-earth geophysics; Applied geophysics; Oceanography; basement; bottom features; crust; Deep Sea Drilling Project; dip; DSDP Site 504; East Pacific; Equatorial Pacific; fault scarps; geophysical methods; geophysical profiles; geophysical surveys; IPOD; Leg 111; Leg 137; Leg 140; Leg 148; Leg 69; Leg 70; Leg 83; Leg 92; Ocean Drilling Program; ocean floors; oceanic crust; Pacific Ocean; reflection; seismic methods; seismic profiles; streamers; surveys; vertical seismic profiles; wave dispersion;
.